# MQ-2 gas sensor

> MQ-2 gas sensor (reference 22131), powered at 5VDC, used to detect a wide range of gases: GPL, H2, CH4, CO, alcohol, smoke and propane. Provides analog or digital output, covers concentrations of approximately 300 - 1000 ppm, and allows simple monitoring, for example by reading pin A0 and displaying via Serial, suitable for Arduino projects and safety systems.

- Page: https://sigmanortec.ro/en/mq-2-gas-sensor
- Price: 9.73 RON
- Availability: In stock; 1-2 zile
- Reference: 22131 · EAN: 5947120772286
- Category: Mechatronics and IoT > Sensors and Modules > Gas and Air Quality Sensors
- Specifications: tension: AD; Input Voltage: 5 VDC
- Package (shipping data): 0.008 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 01:42 (Europe/Bucharest)

## Description

Ideal for Arduino projects and safety systems, this sensor detects a wide range of gases such as LPG, H2, CH4, CO, alcohol, smoke and propane. It operates at 5VDC, offers analog or digital output for fast integration, covers concentrations from approximately 300 to 1000 ppm and allows simple monitoring by reading on A0 and displaying in Serial.
Sensor used to detect gases in general (LPG, H2, CH4, CO, Alcohol, Smoke and Propane).
Specifications:
Supply voltage: 5VDC
Output: Digital pin or Analog pin
Detected concentration: 300 - 1000ppm
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
}