Introduction

The MQ7 is a simple-to-use Carbon Monoxide (CO) sensor suitable for sensing CO concentrations in the air. It can detect CO-gas concentrations anywhere from 20 to 2000ppm. The sensitivity can be adjusted by the potentiometer.

Specification

• Power supply needs: 5V
• Interface type: Analog
• Pin Definition: 1-Output 2-VCC 3-GND
• High sensitivity to carbon monoxide
• Fast response
• Stable and long life
• Size: 40x20mm

Pin Definition

1. Signal Output
2. Power
3. GND

Connection Diagram

Sample Code

///Arduino Sample Code
void setup()
{
  Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}