Product description
MQ-7 sensor module for carbon monoxide (CO). The sensitive material in the MQ-7 gas sensor is SnO2, which has low conductivity in clean air. When the target gas is present, the sensor’s conductivity increases with the gas concentration. A simple electronic circuit can be used to convert this change in conductivity into a corresponding output signal representing the gas concentration.
Specifications:
- High sensitivity to carbon monoxide (CO)
- Adjustable sensitivity
- Supply voltage: 5 V
- Power: 350 mW (the sensor becomes hot during operation)
- Detection range: 20–2000 ppm
- Both digital and analog output
- Dimensions: 52 × 20 × 13 mm
Applications:
- Gas detector for incomplete combustion, e.g. from wood stoves, LPG heaters, and vehicle exhaust gases
- Industrial detector, e.g. for garages
- Portable gas detector
- Popular sensor – many available examples for different platforms
Pin connections:
- AO: Analog output
- DO: Digital output
- GND: Ground
- VCC: 5 V supply voltage
