The MQ-3 Alcohol Sensor Module detects alcohol vapour (ethanol) with high sensitivity and low response to other gases. It is commonly used to build breath alcohol checkers and drunk-driving prevention projects with Arduino.
| Sensor | MQ-3 |
|---|---|
| Detects | Alcohol / ethanol vapour |
| Range | 0.04 – 4 mg/L alcohol |
| Supply voltage | 5V |
| Output | Analog (AO) + Digital (DO) |
| Adjustment | Potentiometer for threshold |
What is the operating voltage?
5V.
Is it accurate like a police breathalyser?
No, it is for projects and learning, not legal measurement.
Does it need warm-up?
Yes, allow a few minutes of heating before reading.
Can I buy the MQ3 Alcohol Sensor Module in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
