# MQ-3 Alcohol Ethanol Gas Sensor

> MQ-3 gas sensor module for detecting alcohol and ethanol vapors, suitable for Arduino projects and safety automation. Supply voltage 5VDC, current draw 150mA. Provides an analog output 0-5V that varies with the detected concentration, plus a digital TTL output with adjustable threshold. Main chips LM393 and ZYMQ, LM393 comparator for simple integration.

- Page: https://sigmanortec.ro/en/mq-3-alcohol-ethanol-gas-sensor
- Price: 15.23 RON
- Availability: In stock; 1-2 zile
- Reference: 22132 · EAN: 5947650793591
- Category: Mechatronics and IoT > Sensors and Modules > Gas and Air Quality Sensors
- Specifications: tension: AD; Input Voltage: 5 VDC
- Package (shipping data): 0.006 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 02:22 (Europe/Bucharest)

## Description

Alcohol and ethanol vapor detection module, ideal for Arduino projects and safety automation. It operates at 5V and has low consumption, offers 0-5V analog output with variable level depending on concentration, plus TTL digital output for thresholds, simple integration thanks to the LM393 comparator.
MQ3 sensor used to detect Alcohol and Ethanol gases.
Specifications:
Supply voltage: 5VDC, 150mA
Output: Digital pin or Analog pin
Main chip: LM393, ZYMQ
Analog output: 0 - 5V; the voltage increases or decreases depending on the detected concentration
TTL Digital Output
Analogue reading code example:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(sensorValue);
delay(1); // delay in between readings for stability
}