# MQ-9 CO Gas Sensor

> MQ-9 sensor module for detecting carbon monoxide and other combustible gases, suitable for Arduino projects and air quality monitoring systems. Detects 10-1000ppm CO and 10-1000ppm other combustion gases. Power supply 5VDC, approx. 50mA. Analog output 0-5V proportional to concentration and digital TTL output for alarm thresholds.

- Page: https://sigmanortec.ro/en/mq-9-co-gas-sensor
- Price: 13.79 RON
- Availability: In stock; 1-2 zile
- Reference: 22138 · EAN: 5940764832781
- Category: Mechatronics and IoT > Sensors and Modules > Gas and Air Quality Sensors
- Package (shipping data): 0.005 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 03:25 (Europe/Bucharest)

## Description

Module for detecting carbon monoxide and other combustible gases, ideal for Arduino projects and air monitoring systems. Detects 10-1000ppm CO and 10-1000ppm combustion gases, operates at 5V with low consumption, provides 0-5V analog output proportional to concentration and TTL digital output for alarm thresholds.
MQ5 sensor used for carbon monoxide detection.
Specifications:
Detected concentration: 10 - 1000ppmCO; 10 1000ppm other combustion gases
Supply voltage: 5VDC, a50mA
Output: Digital pin or Analog pin
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
}