MQ7 - Carbon Monoxide Gas Sensor Module
Description:
MQ7 Gas Sensor Module is a highly sensitive, reliable, and cost-effective sensor used for detecting Carbon Monoxide (CO) gas in the air. It is widely used in safety and environmental monitoring systems like gas leakage alarms, industrial safety systems, home security, and smart monitoring applications. MQ7 sensor works based on a chemical sensing element (SnO₂ - Tin Dioxide), whose conductivity changes when CO gas is present in the environment. This change is converted into readable electrical signals by a microcontroller or ADC circuit.
Features:
1. High sensitivity to Carbon Monoxide (CO)
2. Quick response and recovery time
3. Analog and Digital Output
4. Adjustable sensitivity via onboard potentiometer
5. Long life & low cost
6. Stable and reliable performance
7. Built-in heating element for accurate sensing
Diagram:
Specifications:
| Sensor Type | Semiconductor Gas Sensor |
| Detectable Gas | Carbon Monoxide (CO) |
| Detection Range | 10 ppm to 1000 ppm CO |
| Operating Voltage | 5V DC |
| Output Type | Analog & Digital |
| Heating Voltage | 5V (High Heat) / 1.5V (Low Heat) |
| Preheat Time | 24-48 hours for initial calibration |
| Operating Temperature | -10°C to +50°C |
| Operating Humidity | 20% ~ 90% RH |
| Power Consumption | 150mA (High Heat) / 50mA (Low Heat) |
| Size | 32mm x 20mm x 22mm |
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