Gas Sensors
BME680 (Temperature, Humidity, Pressure and Gas Sensor)
This little sensor contains temperature, humidity, barometric pressure, and VOC gas sensing capabilities. All over SPI or I2C at a great price! Like the BME280 & BMP280, this precision sensor from Bosch can measure humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuracy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with ±1 meter or better accuracy! The BME680 takes those sensors to the next step in that it contains a small MOX sensor. The heated metal oxide changes resistance based on the volatile organic compounds (VOC) in the air, so it can be used to detect gasses & alcohols such as Ethanol, Alcohol and Carbon Monoxide, and perform air quality measurements.Note: it will give you one resistance value, with overall VOC content, but it cannot differentiate gasses or alcohols.
MiCS-5524 (CO, Alcohol and VOC Gas Sensor)
Features:
- MiCS5524 CO, Alcohol and VOC Gas Sensor
- Robust MEMS (Micro Electro Mechanical System) Sensor
- Operating Voltage: 4.9V to 5.1V
- Analog Output via Ao pin (voltage increases as amount of any of the detected gases increases)
- For hobby use
- Current Draw: 25 to 35mA
- Works with Arduino, Teensy & Photon boards. Can be used with Raspberry Pi if you can use an Analog to Digital Converter
MICS-6814 (Air Quality Co, NH3, Nitrogen Oxide Gas Sensor)
The MiCS-6814 is a 3 sensor device suitable for gas leak detection and outdoor air quality monitoring. MiCS-6814 can detect many unhealthful gases, and three gases can be measured simultaneously due to its multi channels, so it can help you to monitor the concentration of gases where you expect the existence of more than one gas.
Detectable gases:
- Carbon monoxide CO 1 – 1000ppm
- Nitrogen dioxide NO2 0.05 – 10ppm
- Ethanol C2H5OH 10 – 500ppm
- Hydrogen H2 1 – 1000ppm
- Ammonia NH3 1 – 500ppm
- Methane CH4 >1000ppm
- Propane C3H8 >1000ppm
- Iso-butane C4H10 >1000ppm
MQ-135 (Air Quality Control Gas Sensor)
MQ-137 (Ammonia (NH3) Sensor Module)
Sensitive material of MQ-137 gas sensor is SnO2, which acts as lower conductivity in clean air. When the target combustible gas exist, the sensor's conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
MQ137 gas sensor has high sensitivity to Ammonia, also to other organic amine. The sensor could be used to detect different gases which are contained Ammonia. It is a low cost module and suitable for different environmental protective application.
MQ-2 (Smoke sensor-HBO, propane, hydrogen)
MQ2 Arduino Sensor is used to detect gas leakage of LPG, Butane Gas or Hydrogen Gas. Great with the project for safety purposes.MQ2 Smoke Gas Sensor Module is a general purpose gas sensor able to detect LPG, butane, methane, alcohol, hydrogen, and smoke. This sensor has a high sensitivity and fast response time. The module outputs a voltage from 0 to 5V relative to the gas concentration.
MQ-3 (Alcohol ethanol Gas sensor)
MQ-4 (Methane Gas Sensor module for Arduino)
MQ-5 (Gas Sensor module LPG, Natural Gas, Coal Gas)
Overview
- Sensitive for LPG, natural gas, coal gas
- An increase in the output voltage along with the concentration of the measured gases
- Rapid reaction and recovery
- Adjustable sensitivity
- Output indicator
Gas Sensor type | Sensitive gas | Application |
| MQ-135 Gas Sensor | Benzene, alcohol, smoke | Air Quality Monitoring |
| MQ-2 gas sensor | HBO, propane, hydrogen | Gas leak detector |
| MQ-3 gas sensor | Alcohol, ethanol | Carbon alcohol, Breathalyzer |
| MQ-5 Gas Sensor | CIS, natural gas, coal gas | Gas leak detector |
| MQ-7 gas sensor | Carbon monoxide | Carbon Monoxide Monitor |
MQ-6 LPG Gas Sensor Module
This is a simple-to-use liquefied petroleum gas (LPG) sensor, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 300 to 10000ppm. This sensor has a high sensitivity and fast response time. 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.
MQ-7 (Carbon Monoxide Gas Sensor Module)
MQ-7 Carbon Monoxide Gas Sensor Module is used to detect Carbon Monoxide (CO) concentration, it can detect CO-gas concentrations anywhere from 20 to 2000ppm. This sensor has a high sensitivity and fast response time. The module outputs a voltage from 0 to 5V relative to the CO concentration. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V.