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ESP32 CAM WiFi Module with OV3660 Camera Module 2MP
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MQ-2 Gas Sensor Module For H2, LPG, CH4, CO, Smoke or Propane Detector Module
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#define sensorPin A0 // analog input pin for MQ-2
int sensorValue = 0;
void setup() {
Serial.begin(9600);
Serial.println("MQ-2 Gas Sensor Test");
delay(2000); // sensor stabilisation
}
void loop() {
sensorValue = analogRead(sensorPin);
Serial.print("Gas Sensor Reading: ");
Serial.println(sensorValue);
if (sensorValue > 400) { // adjust threshold as needed
Serial.println(">> Gas/Smoke Detected! <<");
}
delay(1000);
}
| Feature | MQ-2 | MQ-3 | MQ-7 |
|---|---|---|---|
| Main target gases | Combustible gases & smoke (LPG, propane, methane, hydrogen, etc.) | Alcohol/ethanol vapour (also benzine, smoke to lesser extent) | Carbon monoxide (CO) primarily |
| Typical operation voltage | 5 V heater standard | 5 V heater standard | Complex heating cycle (e.g., 5 V then 1.4 V low-heater mode) for CO detection |
| Specific usage notes | General-purpose gas and smoke sensor; wide detection scope but less selective | More selective toward alcohol vapour; used in breathalyzers and alcohol detection systems | Specialised for CO; requires heating cycle and calibration for accurate measurement |
| Calibration & complexity | Relatively simple; heat up, read analog output | Simple; read analog output, target is alcohol so environment matters | More complex; proper heater cycling and careful calibration needed |
| Best for | Home/DIY gas leak & smoke detection projects | Projects detecting alcohol vapour (e.g., breath analysis, security systems) | Applications where CO detection is important (ventilation, safety, industrial) |
| Considerations / trade-offs | Not very selective; may trigger for a range of combustible gases & smoke | May also respond to other vapours or solvents, not purely alcohol | Higher cost, more complex setup, slower response; careful calibration required |
| Model | MQ2 Gas Sensor |
| Operating Voltage | 5V (DC) |
| Analog Output Voltage | 0V to 5V |
| Digital Output Voltage | 0V or 5V (TTL Logic) |
| Dimensions | 3.6 x 2 x 1 cms |
| Weight | 5 grams |
