INTRODUCTION This is a multifunction air quality monitor that can be detected not only the concentration of particles and formaldehyde but also the value of temperature and humidity. As the particle concentration sensor it can be used to obtain the number of suspended particles in the air by laser. It also integrates in it an electrochemical probe for formaldehyde and an one- chip sensor for temperature and humidity. The sensor can be inserted into variable instruments related to the environment parameters in the air or other environmental improvement equipments to provide correct data in time.  Working principle: Laser scattering principle is used for such sensor, i.e. produce scattering by using laser to radiate suspending particles in the air, then collect scattering light in a certain degree, and finally obtain the curve of scattering light change with time. In the end, equivalent particle diameter and the number of particles with different diameter per unit volume can be calculated by microprocessor based on MIE theory. Please find the functional diagram of each part of sensor from Figure 1 as follows. The function of formaldehyde detector is based on the electrochemical theory and math algorithm. FEATURES Zero false alarm rate Real-time response Correct data Minimum distinguishable particle diameter :0.3 micrometer High anti-interference performance because of the patent structure of six sides shielding Optional direction of air inlet and outlet in order to adapt the different design Concentration of Formaldehyde output Temperature and Humidity output SPECIFICATION Operating Voltage: 5.0VDC Active Current: 100 mA Standby Current: ≤200 uA Interface Level: L <0.8V@3.3V; H> 2.7V@3.3V Particle Range of measurement: 0.3 ~ 1.0μm; 1.0 ~ 2.5μm; 2.5 ~ 10μm Particle Counting Efficiency: 50%@0.3μm 98%@>=0.5μm Particle Effective Range (PM2.5 standard): 0 ~ 500μg/m Particle Maximum Range (PM2.5 standard)*: >0 ~ 2000ug / m³ Particle Resolution: 1ug / m³ Particle Maximum Consistency Error (PM2.5 standard data)*: ±10%@100~500μg/m³ ±10μg/m³@0~100μg/m³ Particle Standard Volume: 0.1 L Formaldehyde Effective Range: 0 ~ 1 mg / m³ Formaldehyde Maximum Range: 0 ~ 2 mg / m³ Formaldehyde Resolution: 0.001 Formaldehyde Maximum Consistency Error: <± 5% Temperature Maximum Range: -20~99 ? Temperature Resolution: 0.1 ? Temperature Maximum Error: ± 0.5 ? Humidity Maximum Range: 0 ~ 99% Humidity Resolution: 0.1% Humidity Maximum Error: ± 2% Default Baud rate: 9600bps Total Response time: ≤ 10s Operating Temperature Range: -10 ~ +60 ? Working Humidity Range: 0~99% MTTF: ≥ 3 years Dimension: 50 * 38 * 21 mm/1.97*1.50*0.83 inches SHIPPING LIST Air Quality Monitor (PM 2.5, Formaldehyde, Temperature & Humidity Sensor) x1 8-Pin Cable x1 PM2.5 Adapter Board x1

INTRODUCTION The analog gas sensor - MQ3 is suitable for detecting alcohol, this sensor can be used in a Breathalyser.It has a high sensitivity to alcohol and small sensitivity to Benzine. The sensitivity can be adjusted by the potentiometer. Notice:The new version of analog sensor port pin mapping has been changed as the following two features.Please check the tips for changing sensor cable pin mapping while using the I/O Expansion shield. We will continue to update. For the inconvenience caused, please understand. SPECIFICATION Power supply: 5V Interface type: Analog High sensitivity to alcohol and small sensitivity to Benzine Fast response and High sensitivity Stable and long life Simple drive circuit Size: 36.4x26.6mm SHIPPING LIST Analog Gas sensor (MQ3) x1 Analog Cable x1 Acrylic Base(with nylon screws) x1  IMPROVEMENT LIST Standard assembling structure (Times-of-5mm Center distance between four 3mm mounting holes) Easily recognitive interfaces of sensors ("A" for analog and "D" for digital) Icons to simplely illustrate sensor function  High quality connector & potentiometer Immersion gold surface     

INTRODUCTION The MQ4 is used in gas leakage detecting equipment in consumer and industry markets, this sensor is suitable for detecting CH4,Natural gas, LNG, avoid exposure to alcohol, cooking fumes, and cigarette smoke. The sensitivity can be adjusted by the potentiometer. Notice: The new version of analog sensor port pin mapping has been changed as the following two features. Please check the tips for changing sensor cable pin mapping while using the I/O Expansion shield. We will continue to update. For the inconvenience caused, please understand. Improvement List Standard assembling structure (Times-of-5mm Center distance between two 3mm mounting holes) Easily recognitive interfaces of sensors ("A" for analog and "D" for digital) Icons to simply illustrate sensor function  High quality connector Immersion gold surface SPECIFICATION Power supply: 5V Interface type: Analog Pin Definition:  1-Output  2-GND  3-VCC High sensitivity to CH4?Natural gas Small sensitivity to alcohol, smoke Fast response Stable and long life Simple drive circuit Size: 40x20mm SHIPPING LIST Analog Gas sensor (MQ4) x1

Ever want to build your own weather station? This anemometer is made of shell, wind cups and circuit module. It has built-in photovoltaic module, industrial microcomputer processor, and standard current generator. Made with aluminium alloy, the anemomter is of high strength, weather resistance and corrosion resistance. The millitary quality interface ensures long life of this anemometer, at the same time enhancing the accuracy of wind speed acquisition. Together with other components, this anemometer can be widely used in measureing wind in areas such as engineering, railways, docks, power plants, meteorological, cableway, environment study, agriculture, energy monitoring, health study with corresponding signal output. With the instructions and sample code, users can easily get wind speed level through voltage signal output (0 to 5v). Specifications: Model：JL-FS2 Type：three cups Output signal range：0-5V (Voltage signal) Supply voltage:  DC12-24V Power consumption：Voltage MAX≤0.3W Start wind speed：0.4-0.8m/s Resolution：0.1m/s Effective measurement range：0-30m/s  System error：±3% Transmission distance: No more than 8 meters Transmission medium: Cable transmission Connection mode：Three wires Working temperature：-40℃~80℃ Wiring map：VCC (Red), GND (Black),Voltage (Yellow), Current (Blue) Weight：1Kg Documents: Wiki Doc

The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000ppm.   The sensor's output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC. Specifications: Power supply: 5V Documents: MQ7 datasheet Wiring sample 

INTRODUCTION CCS811 Air Quality Sensor can measure the eCO2 (equivalent CO2) and TVOC (Total Volatile Organic Compounds) density. It can be widely used in many applications, such as air quality detection, air purifiers, ventilation system, and so on. This CCS811 air quality sensor uses AMS's unique micro-hot plate technology. Compared to conventional gas sensors, the heating wire is lower power consumption, heating faster, and smaller. Internally integrated ADCs and MCUs allow data to be collected, calculated, and returned via I2C. The CCS811 supports a concentration alarm, which is triggered when the concentration exceeds the user-set threshold. The CCS811 air quality sensor supports multiple modes, such as detect in every second, in every 10s, in every one minute, in every 250ms and sleep mode. These modes are optimized for low power consumption during the sensor measurement, so the CCS811 is also suitable for portable applications. NOTE: The chip has stretched the clock in I2C. So, it is not compatible with some controllers, such as Raspberry Pi. FEATURES Short warm-up time Low power consumption High integrated MCUs and ADCs IAQ threshold alert APPLICATIONS Air quality detection in cars Indoor air quality detections Air purifiers Smart home Ventilation system SPECIFICATION Operating Voltage: 3.3V~5.5V Warm-up Time: <15s I2C Address: 0x5A (in default) / 0x5B Operating Temperature Range: -40℃~85℃ Operating Humidity Range: 10%RH~95%RH eCO2 Measuring Range: 400ppm~8000ppm TVOC Measuring Range: 0ppb~1100ppb Dimension: 16*20mm / 0.63*0.79“ SHIPPING LIST CCS811 Air Quality Sensor x1 2.54-7P Black Single Row Pin x1

F1031V Mass Air Flow Sensor adopts thermodynamic principle to detect flow rate of gas medium in the flow channel, with high precision and good repeatability. It comes with built-in temperature sensor to provide temperature compensation for measured data. Meanwhile, the sensor has liner analog voltage output, easy to use. It can be used in applications like ventilator, air purifiers, etc. Features: High precision, fast response, good repeatability Completely calibrated and temperature compensated Applications: Intensive care ventilator Portable ventilator Industrial process control Environment protection Air purifier Specifications: Measuring Range: 150SLM (SLM: standard litre per minute. Standard-state: 20℃ gas temperature and 101.325 kPa gas pressure )  Power Supply: 5V Operating Current: 25mA Accuracy: <4%FS Response Time: 50ms Operating Temperature Range: -25℃~65℃ Working Pressure: <100kPa Documents: Product wiki

This Fermion: ENS160 Air Quality Sensor, based on ScioSense's new ENS160 sensor chip, is specifically designed for indoor air quality monitoring and offers detection of multiple IAQ data(TVOC, eCO2, AQI). The innovative TrueVOC™ technology combines the metal oxide(MOX) technology that brings this sensor superior accuracy, fast response, anti-interference, etc. With intelligent on-chip algorithms, the ENS160 can directly output rich and easy-to-understand environmental data. Preheat the sensor 3 minutes before use then you can obtain accurate data more quickly. What's more, the built-in automatic baseline correction algorithm ensures the long-term stability of the sensor.                                                                                                              Board Overview                                                                          Connection Diagram (with FireBeetle Board ESP32-E)                                                                                   Connection Diagram (with Raspberry Pi) Features: Multiple IAQ outputs (TVOC, eCO2, AQI), various environmental data Less than 3 minutes warm-up time, get data faster Built-in algorithm, more accurate output Automatic baseline correction, more stable for long-term use Applications: Air purification/home automation device Environmental pollution detection HVAC/Ventilation system Building automation/smart thermostat Electrical appliances/ range hoods Specifications: Power Supply Voltage: 3.3V Working Current: 29mA Interface Mode: I2C, SPI I2C Address: 0x52, 0x53(Default) Operating Temperature Range: -40℃~85℃ Working Humidity Range: 5%RH~95%RH eCO2 Measurement Range: 400ppm~65000ppm TVOC Measuring Range: 0ppb~65000ppb Product Size: 20 x 15mm/ 0.79 x 0.59” Documents: Product wiki Dimension ENS160 Manual DXF STP PCB Package

This is a hydrogen and nitrogen oxide gas concentration sensor launched by DFRobot. The sensor uses MEMS technology to support gas concentration detection of NO, NO2 and H2. The matching sample code integrates the concentration conversion formula of various gas to facilitate the testing and use of sensors. The product supports 5V power supply, analog voltage output, and has power supply enable/disable pins for low power consumption.                                                                                                                        Board Overview                                                                                                                                     Connect Diagram Features: Integrates the concentration conversion formula Low power consumption. Applications: Gas leak detection Gas safety equipment Air environment detection Specifications: Detection of Physical Quantities: Gas concentration or gas leakage of NO, NO2, H2 Operating voltage: 4.9～5.1V DC Power dissipation: 0.45W Output signal: Analog quantity Measuring range:         1 – 1000ppm(Hydrogen H2)         0.05 – 10ppm(Nitrogen dioxide NO2 ) Working temperature: -30～85℃ Working humidity: 5～95%RH （No condensation） Storage temperature: -40~85℃ Lifespan: >2 years（in the air） Circuit board size：12mm×16mm Mounting hole size：Inner diameter 2mm/outer diameter 4mm Documents: Product wiki MiCS-5524 Datasheet Schematics Diagram Dimension and Component Layout

This is a hydrogen and nitrogen oxide gas concentration sensor launched by DFRobot. The sensor uses MEMS technology to support gas concentration detection of CO, CH4, C2H5OH, C3H8, C4H10, H2, H2S and NH3. The matching sample code integrates the concentration conversion formula of various gas to facilitate the testing and use of sensors. The product supports 5V power supply, analog voltage output, and has power supply enable/disable pins for low power consumption. Connection Diagram: Features: Support a variety of harmful gas detection Integrate the calculation formulas of various gas concentration Low power consumption I2C digital output Compatible with the 3.3~5.5V master controller Applications: Gas leak detection Gas safety equipment Air environment detection Specifications: Detection of Physical Quantities: Gas concentration or gas leakage of CO, CH4, 2H5OH, C3H8, C4H10, H2, H2S, NH3 Operating voltage: 4.9～5.1V DC Power dissipation: 0.45W Output signal: Analog quantity Measuring range:         1 – 1000ppm (Carbon monoxide CO)         10 – 500ppm (Ethanol C2H5OH)         1 – 1000ppm (Hydrogen H2)         1 – 500ppm (Ammonia NH3)         >1000ppm (Methane CH4) Working temperature: -30～85℃ Working humidity: 5～95%RH (No condensation) Storage temperature: -40~85℃ Lifespan: >2 years (in the air) Circuit board size：12mm x 16mm Mounting hole size：Inner diameter 2mm/ outer diameter 4mm Documents: Product wiki MiCS-5524 Datasheet Schematics Diagram Dimension and Component Layout

The SGP40 Air Quality sensor adopts the new SGP40 digital VOC sensor chip launched by the well-known Sensirion. Based on the Sensirion’s CMOSens® technology, the SGP40 offers a complete sensor system on a single chip, a temperature-controlled micro-hotplate and a humidity-compensated indoor air quality signal. In combination with Sensirion’s powerful VOC algorithm, the sensor signal can be directly used to evaluate indoor air quality. It features low power(2.6mA), and fast response(2s). The data from the sensor can be directly used to evaluate air quality without calibration. With compact and small body, this Breakout SGP40 Air Quality sensor is very suitable for indoor projects that will be used for a long time, such as refitting air purifiers, kitchen hoods, etc. Besides, we provide you with C and Python libraries for using with different main-controllers. Note: VOC index is obtained by converting the detected ethanol equivalent in air. Features: Ultra-low Power Consumption(2.6mA) Built-in Temperature and Humidity Compensation, no need to calibrate VOC Index for direct Air Quality Indication Applications: Air Purifiers Kitchen Hoods Demand-controlled Ventilation Thermostats Indoor Air Quality Monitoring Specifications: Power Supply: 3.3V~5V Operating Current: 2.6mA Preheat Time: 10S Response Time: 2S Communication: I2C I2C Address: 0x59 Operating Temperature Range: -10℃~50℃ Storage Temperature Range: 5℃~30℃ Operating Humidity Range: 0%RH~90%RH VOC Index: 0-500 Measuring Range: 0-1000ppm(Ethanol Equivalent) Dimension: 18*11.5mm/ 0.71*0.45” Documents: Product wiki

This is an Arduino compatible alcohol sensor module from DFRobot with a 0-5ppm measuring range, supporting I2C and UART outputs. Aiming at fast and accurate detection of alcohol gas concentration in the air, the sensor is well applicable to the small alcohol concentration measurement in the breathalyzer, smart vehicle, and so on. Based on the electrochemistry principle, this alcohol sensor has been calibrated before the factory. It is characterized by strong anti-interference, high stability, and sensitivity and up to 2 years of service life. The module supports 0.01ppm(10ppb) resolution and 3.3~5.5V wide-range voltage input and works well with mainstream controllers like Arduino, ESP32, and Raspberry Pi. With the easy-to-use Gravity interface and the sample program provided by us, you can conveniently build your alcohol concentration detector using this sensor.                                                                                                                        Board Overview Specifications: Detected Gas: alcohol Interfering Gas: benzene(C6H6), toluene(C7H8), acetic acid(CH3COOH), hydrogen sulfide(H2S), carbon monoxide(CO) Operating Voltage: 3.3～5.5V DC Power: 0.05W（5V） Signal Output: I2C, UART(0~3V) Measuring Range: 0~5ppm Resolution: ≤0.01ppm（10ppb） Preheat Time: ≤3min Response Time: ≤60s Recover Time: ≤60s Operating Temperature: -20～50℃ Operating Humidity: 15～90%RH (No condense) Storage Temperature: 0~25℃ Service Life: >2 years(In the air) Board Dimension: 27mm×37mm/1.06×1.46" Documents: Product wiki More Documents

This is an Arduino Carbon Monoxide Sensor. It uses MQ7 probe to detect Carbon Monoxide (CO)  concentrations in the air from 20 to 2000ppm. The sensitivity can be adjusted by the potentiometer.  The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.   To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino microcontroller. Specifications: Power supply needs: 5V Interface type: Analog Pin Definition:  1-Output  2-GND  3-VCC High sensitivity to carbon monoxide Fast response Stable and long life Size: 40x20mm(1.57"x0.79") Documents: Wiki (Analog Carbon Monoxide Sensor (MQ7) For Arduino) MQ7 datasheet Schematic

This is an Arduino CO/Combustible Gas sensor. It uses MQ-9 to dectect Carbon Monoxide. The sensor can be used to detect different gases containing CO and combustible gases, it is low cost and suitable for a variety of applications.  The core sensing material of MQ-9 gas sensor is SnO2, which has a lower conductivity in clean air. It makes detection by cycling high and low temperature, and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When temperature rises (heated by 5.0V), it detects Methane, Propane, combustible gas,etc  and cleans the other gases adsorbed under low temperature. The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.    To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino microcontroller.  Applications: Domestic gas leakage detector Industrial gas detector Portable gas detector Specifications: Power supply needs: 5V Interface type: Analog Sensor Type: Semiconductor Concentration: 10-1000ppm CO 100-10000ppm combustible gas Good sensitivity to CO/Combustible gas High sensitivity to Methane, Propane and CO Long life and low cost Size: 36.4x26.6mm(1.43"x1.05") Documents: Wiki Doc                   Schematic MQ9 Datasheet

INTRODUCTION "Greenhouse Effect" is melting the Earth ice core every minute and creating dangerous icebergs. By knowing the exact concentration of CO2, we can do something to reduce the CO2 and to protect our Earth. For that reason, this CO2 sensor is designed by DFRobot engineer. This is the first CO2 sensor in Arduino market.  The output voltage of the module falls as the concentration of the CO2 increases. The potentiometer onboard is designed to set the threshold of voltage. As long as the CO2 concentration is high enough (voltage is lower than threshold),  a digital signal (ON/OFF) will be released. It has MG-811 sensor module onboard which is highly sensitive to CO2 and less sensitive to alcohol and CO, low humidity & temperature dependency. All components have industrial quality for stability and reproducibility. Onboard heating circuit brings the best temperature for sensor to function. Internal power boosting to 6V for heating sensor best performance.  This sensor has an onboard conditioning circuit for amplifying output signal.  Notice:The new version of analog sensor port pin mapping has been changed as the following two features.Please check the tips for changing sensor cable pin mapping while using the I/O Expansion shield. We will continue to update. For the inconvenience caused, please understand. APPLICATIONS Air Quality Control Ferment Process Control Room Temperature CO2 concentration Detection SPECIFICATION Operating voltage:5V Interface: Analog One digital output High quality connector Immersion gold surface Onboard heating circuit Size:32x42mm

This is a generic Arduino gas sensor. It has MQ2 probe which is able to detect LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke. It can be used in gas leakage detecting device in consumer and industry markets. It has a high sensitivity and fast response time. The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.  To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino. As this sensor can work at 3.3V which makes it compatible with Raspberry Pi, intel edison, joule and curie.  Improvement List: Standard assembling structure (Times-of-5mm Center distance between two 3mm mounting holes) Easily recognitive interfaces of sensors ("A" for analog and "D" for digital) Icons to simplely illustrate sensor function  High quality connector Immersion gold surface Specifications: Power supply needs: 5V Interface type: Analog Wide detecting scope Fast response and High sensitivity Simple drive circuit Stable and long life Size:36.4x26.6mm (1.4x1'') Documents: Wiki Doc MQ2 datasheet Schematic

This is an Arduino hydrogen gas sensor. It has high sensitivity to Hydrogen (H2) and less sensitivity to alcohol, LPG,cooking fumes . Hydrogen gas is highly flammable and will burn in air at a very wide range of concentrations   The sensitivity is able to be adjusted by the potentiometer.  The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.    To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino microcontroller.    What is Hydrogen?  Hydrogen is a chemical element with chemical symbol H and atomic number 1.    SPECIFICATION Power supply needs: 5V Interface type: Analog Pin Definition:  1-Output  2-GND  3-VCC High sensitivity to Hydrogen (H2) Small sensitivity to alcohol, LPG,cooking fumes Stable and long life Size: 40x20mm(1.57"x0.79")   SHIPPING LIST Arduino Hydrogen Gas Sensor (MQ8) x1  

The concentration of carbon dioxide (0.03% usuallly) is related to daily life. Recently, there’s a study showing that the atmospheric CO2 content has reached 0.0385% (385 ppm) which is the highest value since 2.1 million years. The raise of atmospheric CO2 content to some extent results in global climate change. How to accurately measure the carbon dioxide gas concentration is becoming a universal research topic.DFRobot released its latest high-precision analog infrared arduino CO2 sensor. The effectively measuring range is from 0 to 5000ppm. This sensor is based on non-dispersive infrared (NDIR) technology and has good selectivity and oxygen-free dependency. Besides, its service life could up to 5 years! It integrates temperature compensation and support DAC output. Most importantly, the product is easy to use; it is compatible with all types of microcontrollers such as Arduino with ADC function.In addition, this Gravity: Analog Infrared CO2 Sensor For Arduino (0~5000 ppm) is a high-performance sensor that combines technology of mature infrared absorption gas detection with precision optical circuit design as well as sophisticated circuit design. It has characteristics such as high sensitivity, high resolution, low power consumption, fast response, anti-water vapor interference, no poisoning, high stability and long life.This Gravity: Analog Infrared CO2 Sensor is able to directly compatible with the DFRobot Arduino IO expansion board thanks to its external DFRobot Gravity interface. This character simplify the use of the sensor as it is plug and play and no need additional wiring.This CO2 Sensor could be widely used in HVAC, indoor air quality monitoring, industrial process and security protection monitoring, agriculture and animal husbandry production process monitoring.DFRobot provides detailed tutorials and code, please check the product wiki.       DFRobot LCD Keypad Shield with Infrared Co2 Sensor This is a 0~5000ppm CO2 sensor with analog output. It supports Arduino and other microcontrollers with ADC function. In addition, we also have a 0~50000 ppm wide range infrared sensor with Gravity UART interface, Compatible with Arduino, Raspberry Pi and other microcontrollers: Gravity: UART Infrared CO2 Sensor (0~50000ppm).   Analog Infrared CO2 Sensor For Arduino Tutorial: ESP32 Arduino: Using an infrared CO2 sensor ESP32 Arduino: Temperature, humidity and CO2 concentration web server   FEATURES Waterproof and anti-corrosion High sensitivity Low power consumption Excellent stability Temperature compensation Excellent linear output High cycle life Anti-water vapor interference No poisoning SPECIFICATION Gas Detection: Carbon Dioxide Operating Voltage: 4.5 ~ 5.5V DC Average Current: <60mA @ 5V Peak Current: 150mA @ 5V Output Signal: Analog output (0.4 ~ 2V) Measuring Range: 0 ~ 5000ppm Accuracy: ± (50ppm + 3% reading) Preheating Time: 3min Response Time: 120s Operating Temperature: 0 ~ 50 ℃ Operating Humidity: 0 ~ 95% RH (no condensation) Service Life: >5 years Size: 37mm * 69mm weight: 34g SHIPPING LIST Gravity: Analog Infrared CO2 Sensor For Arduino x1 Analog Sensor Cable for Arduino x1

This is an Arduino LPG gas sensor. It has MQ5 probe which is very sensitive with LPG, natural gas , town gas. It is less sensitive with alcohol, cooking fumes and cigarette smoke. The sensitivity can be adjusted by the potentiometer.  The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.  To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino.  Specifications: Power supply needs: 5V Interface type: Analog Pin Definition:  1-Output  2-GND  3-VCC High sensitivity to LPG, natural gas, town gas Small sensitivity to alcohol, smoke Fast response Stable and long life Simple drive circuit Size: 40x20mm(1.57"x0.79") Documents: Wiki Doc MQ5 datasheet Schematic

This is an Arduino Propane Gas Sensor. It uses MQ6  probe to detect iso-butane, propane and liquefied petroleum gas (LPG). It is less sensitive with alcohol, cooking fumes and cigarette smoke. It can be used in gas leakage detecting equipment in consumer and industry applications,  The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of gas. You can use analog reading to read the data from this sensor.  To ease the difficulty of using this sensor,  a Gravity Interface is adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this senor connecting to your Arduino.  Specifications: Working Voltage: 5V Interface type: Analog Pin Definition:  1-Output  2-GND  3-VCC High sensitivity to LPG, iso-butane, propane Small sensitivity to alcohol, smoke Fast response Stable and long life Simple drive circuit Size: 40x20mm(1.57"x0.79") Documents: Wiki Doc MQ6 datasheet Schematic

Gravity: CCS811 Air Quality Sensor can measure the eCO2 (equivalent CO2) and TVOC (Total Volatile Organic Compounds) density. It can be widely used in many applications, such as air quality detection, air purifiers, ventilation system and so on. This CCS811 air quality sensor uses AMS's unique micro-hot plate technology. Compared to conventional gas sensors, the heating wire is lower power consumption, heating faster, and smaller. Internally integrated ADCs and MCUs allow data to be collected, calculated and returned via IIC. The CCS811 supports a concentration alarm, which is triggered when the concentration exceeds the user-set threshold. The CCS811 air quality sensor supports multiple modes, such as detect in every second, in every 10s, in every one minute, in every 250ms and sleep mode. These modes are optimized for low power consumption during the sensor measurement, so the CCS811 is also suitable for portable applications. NOTE: The chip has stretched the clock in IIC. So, it is not compatible with some controllers, such as Raspberry Pi. FEATURES Short warm-up time Low power consumption High integrated MCUs and ADCs IAQ threshold alert APPLICATIONS Air quality detection in cars Indoor air quality detections Air purifiers Smart home Ventilation system SPECIFICATION Operating Voltage: 3.3V~5.5V Current in Sleep: 0.7uA Warm-up Time: <15s IIC Address: 0x5A (in default) / 0x5B Operating Temperature Range: -40℃~85℃ Operating Humidity Range: 0ppb~1100ppb Dimension: 22*31mm / 0.87*1.22inch SHIPPING LIST Gravity: CCS811 Air Quality Sensor x1 Gravity-4P I2C/UART Wire x1 2.54-4P Black Pin x2

This is a sensor that detects chlorine concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of chlorine in the environment. Can be widely used in the detection of chlorine in the chemical, pharmaceutical production, and environmental protection fields. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a chlorine concentration detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications: Chemical chlorine detection pharmaceutical production chlorine detection Environmental protection device Specifications: Detection Gas: Chlorine (CL2) Detection range: 0~10ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: ＞2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki

This is a sensor that detects carbon monoxide and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of carbon monoxide in the environment. Can be widely applied to fields like portable devices, air quality monitoring devices, industries, mines, warehouses, and other spaces where the air is not easy to circulate. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a carbon monoxide detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications: Petrochemical carbon monoxide detection Metallurgy carbon monoxide detection Mining carbon monoxide detection Environmental protection Specifications: Detection Gas: Carbon Monoxide (CO) Detection range: 0-1000ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: >2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki

INTRODUCTION Sharp GP2Y1010AU Dust Sensor requires some wiring on the breadboard and a list of components to make it Arduino compatible. This has turned down several people due to the thin wires of the sharp sensor making it yet another addition to the drawer. We've listened your requests and created this adapter so you can get started right away on your project.  If you are planning to assemble several sensors for your air station and need to have it working soon, this adapter will save time on circuit building and debugging. Not only this but it is also fully compatible with our sensor connectors, so you can directly connect it to our expansion boards all together with our large range of sensors. APPLICATIONS Air monitoring. Air filtering. Air quality station. SPECIFICATION Voltage:  5V Size:  27x27mm Integrated LED for power indicator. On-board silkscreen: A is for analog pin D is for digital pin?     SHIPPING LIST Dust Sensor Adapter  x1 Adapter cable  x1 Digital cable  x1 Analog  cable  x1

This Gravity: ENS160 Air Quality Sensor, based on ScioSense's new ENS160 sensor chip, is specifically designed for indoor air quality monitoring and offers detection of multiple IAQ data (TVOC, eCO2, AQI). The innovative TrueVOC™ technology combines the metal oxide (MOX) technology that brings this sensor superior accuracy, fast response, anti-interference, etc. With intelligent on-chip algorithms, the ENS160 can directly output rich and easy-to-understand environmental data. Preheat the sensor 3 minutes before use then you can obtain accurate data more quickly. What's more, the built-in automatic baseline correction algorithm ensures the long-term stability of the sensor.                                                                                                                      Board Overview                                                                                                                                         Connection Diagram Features: Multiple IAQ outputs (TVOC, eCO2, AQI), various environmental data Less than 3 minutes warm-up time, get data faster Built-in algorithm, more accurate output Automatic baseline correction, more stable for long-term use Applications: Air purification/home automation device Environmental pollution detection HVAC/Ventilation system Building automation/smart thermostat Electrical appliances/ range hoods Specifications: Power Supply Voltage: 3.3 V~5.5 V Working Current: 29 mA Interface Mode: I2C I2C Address: 0x52, 0x53 Operating Temperature Range: -40℃~85℃ Working Humidity Range: 5 %RH~95 %RH eCO2 Measurement Range: 400 ppm~65000ppm TVOC Measuring Range: 0ppb~65000ppb Product Size: 30x22 mm/1.18x0.87 inch Documents: Product wiki Schematics Dimension ENS160 Manual

The Formaldehyde (HCHO) sensor is an Arduino & Raspberry Pi compatible module, which is the ideal solution for indoor air quality monitor.This is a HCHO(CH2O) sensor module. It can be used to measure HCHO in air. Through it, you can know the air quality. This sensor module is widely used in many air testing applications, such as indoor air quality, real time quality monitoring stations. Our HCHO sensor module can detect and measure HCHO accurately. Many advantages are available, such as strong anti-jamming capability, high stability, ATC, high sensitivity(up to 0.01ppm) and long life(2 years in air). Integrated with Gravity Interface which is easy to used, wide input voltage, and optional output signal, Our module can be almost compatible with all MCU. According our sample codes , an HCHO detector can be made very quickly.This is a formaldehyde (HCHO) sensor module with small size, and Arduino compatibility. Through it, you can measure the concentration of formaldehyde in air and know the Real-Time air quality. It can be widely used in many air testing applications, such as indoor air quality, real time quality monitoring stations. Applied in a DIY formaldehyde detector is also suitable.The common solution to measure HCHO in air is the reagent or colourimetric card. But this solution will occupy much time, and used only once. And the result is not very accurate and you just know probably. VOC gas sensor is second generation solution. it can detect HCHO roughly, because this sensor only expresses the whole concentration of VOC gas, not just HCHO only.DFRobot Gravity Formaldehyde sensor module can detect and measure HCHO gas concentration accurately. Many advantages are available, such as strong anti-jamming capability, high stability, ATC, high sensitivity(up to 0.01ppm) and long life(2 years in air). It also support 3.3~6V wide range power supply, it means it could be used with Arduino and Raspberry Pi directly. The Formaldehyde monitor integrates with Gravity Interface, easy to use, plug and play. According the sample codes, it is easy to make your own formaldehyde detector. Combined with IOT, it is possible to make an automaic air quality station which can measure HCHO in different sites.     Cautions:1. When using the sensor module, do not touch the white sensing film.2. Please keep away from high concentration Hydrogen sulfide, hydrogen, methanol, ethanol, carbon monoxide. These gases will affect the precision and 3. reduce the service life.4. Please keep the modules warming up for at least 5 minutes when first using.5. The sensor shall avoid organic solvent, coatings, medicine, oil and high concentration gases6. Please do not plug the sensor which on the module, and do not modify components on the PCB.7. Excessive impact or vibration should be avoided.8. Please do not use the modules in systems which related to human being’s safety.9. Please do not use the modules in strong air convection environment.10. Please do not expose the modules in high concentration organic gas for a long time. FEATURES  High stability and sensitivity Automatic temperature compensation Wide input voltage(3.3~6V) Support DAC and UART output Long life(2 years in air) High resolution (0.01ppm) SPECIFICATION Input Voltage: 3.3~6V Target Gas: HCHO Interference Gas: Alcohol, CO & etc Detection Range: 0~5ppm Resolution: 0.01ppm Warm Up Time: ≤3 minutes Response Time: ≤60 seconds Resume Time: ≤60 seconds Interface Type: Gravity-3Pin Output Signal: Optional DAC(0.4～2V,for 0-5ppm) or UART(9600) Operating Temp: 0~50℃ Operating Hum: 15%RH-90％RH(No Condensation) Storage Temp: 0~50℃ Working Life: 2 years(in air) Dimension: 38*28*15mm/1.50*1.10*0.59inches Weight: 22 g SHIPPING LIST HCHO Sensor Module x1 Digital Gravity 3Pin Cable x1 M3 * 10 nylon column x4 M3 * 5 screw x8

This is a sensor that detects hydrogen concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen in the environment. Can be widely used in the detection of hydrogen in industrial and environmental protection fields. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a hydrogen concentration detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications: Industrial hydrogen detection Environmental protection device Speicifications: Detection Gas: Hydrogen (H2) Detection range: 0~1000ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: >2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki

This is a sensor that detects hydrogen sulfide concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen sulfide in the environment. Can be widely used in the detection of hydrogen sulfide in industrial, underground, and environmental protection fields. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a hydrogen sulfide concentration detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications: Underground hydrogen sulfide detection Industrial hydrogen sulfide detection Environmental protection device Specificatios: Detection Gas: Hydrogen sulfide (H2S) Detection range: 0~100ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: ＞2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki

This is a sensor that detects hydrogen chloride concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen chloride in the environment. Can be widely used in the detection of hydrogen chloride in the industrial, underground, and environmental protection fields. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a hydrogen chloride concentration detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications: Industrial hydrogen chloride detection Underground hydrogen chloride detection Environmental protection device Specifications: Detection Gas: Hydrogen chloride (HCL) Detection range: 0~10ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: >2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki

This is a sensor that detects hydrogen fluoride concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen fluoride in the environment. Can be widely used in the detection of hydrogen fluoride in industrial and environmental protection fields. The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a hydrogen fluoride concentration detector. DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs. Features: Strong anti-interference ability High stability High sensitivity Applications:Features: Industrial hydrogen fluoride detection Environmental protection device Specifications: Detection Gas: Hydrogen fluoride (HF) Detection range: 0~10ppm Working Voltage: 3.3～5.5V DC Working Current: ＜5mA Output Signal: I2C, UART (0~3V), analog voltage Working Temperature: -20～50℃ Working Humidity: 15～90%RH (non-condensing) Storage Temperature: -20～50℃ Storage Humidity: 15～90%RH (non-condensing) Lifespan: >2 years (in the air) Adapter Plate Size: 37*32mm Compatibility: Arduino, ESP32, Raspberry pi Documents: Product wiki