Gravity: Analog Alcohol Sensor (MQ3)
MQ3-based analog alcohol sensor with high sensitivity to ethanol and lower sensitivity to benzene. Adjustable sensitivity; plug-and-play Gravity interface with analog cable included.
Pinout
- OutputOfficial table 2 row 1
Signal Output
Type · GPIO - 5VOfficial table 2 row 2
Power
Type · Power - GNDOfficial table 2 row 3
GND
Type · Ground
| Pin | Position | Type | Function |
|---|---|---|---|
| Output | Official table 2 row 1 | GPIO | Signal Output |
| 5V | Official table 2 row 2 | Power | Power |
| GND | Official table 2 row 3 | Ground | GND |
Pin details
3 connections- OutputOfficial table 2 row 1
Signal Output
GPIO - 5VOfficial table 2 row 2
Power
Power - GNDOfficial table 2 row 3
GND
Ground
Start wiring
I2C · Analog · UART · 3.3 – 5 V · Breakout
Waveshare lists MQ-2 for combustible gases and smoke, MQ-3 for alcohol, and MQ-135 for mixed indoor pollutants such as NH3, NOx, alcohol,…
Module pins: 5V, GND. Schematik maps them to your board in the app.
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