BoardPilotMQ-6 LPG sensor with ESP32
Supply 5 V
Bus ANALOG
Measures lpg, gas
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | VIN | Needs 5 V for the heater (about 150 mA): use VIN |
| GND | Ground | GND | |
| DO | Output (the part drives it) | D25 | Threshold output. Its HIGH level is 5 V: use a voltage divider |
| AO | Analog output | D34 | Can reach 5 V: use a voltage divider before the ADC |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Starter code (Arduino)
void setup() { Serial.begin(115200); }
void loop() {
int mv = analogReadMilliVolts(34); // AO on GPIO 34
Serial.println(mv);
delay(200);
}Sources
- Hanwei MQ-6 datasheet, Most sensitive to LPG, isobutane and propane
- Hanwei MQ-6 datasheet, Heater 5 V; needs a burn-in / warm-up time before readings are stable
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.