Robot Pi Shop

MQ-9 Carbon Monoxide, Flammable Gasses

$3.50
Quantity

This is an easy to use sensor module you can use to sense the amount of contaminant in surrounding air, giving the reading of air quality index. This is a famous sensor module commonly used with Arduino to build smoke detectors, IoT environment monitoring and smart agricultural projects.

Note : This sensor works with both digital and analog mode. You can connect analog output (AO) to get the air quality index reading (conversion required), or you can connect the digital output (DO) to sense the threshold of air quality. Adjust the potentiometer (a.k.a. trimmer) to set the digital output (DO) sensitivity.

This gas sensor heating element is alternating between 1.4V and 5V.

Sensitive to Gas

  • Carbon Monoxide (CO)
  • Flammable gases

Common Features

  • Operating voltage : 5V
  • Output type : DIGITAL and ANALOG
  • Preheat duration : 20s
  • Adjustable sensitivity via potentiometer
  • Comes with LED indicators for POWER and OUTPUT
  • Fixed screw holes for easy installation
  • Model : FC-22

Pinout and Wiring:

Label Meaning Connection
VCC Power source Connect to 5V of system
GND Ground Connect to GND of system
DO Digital Output Connect to digital IO pin
AO Analog Output Connect to analog input pin

Code

Hardware Components

You will require the following hardware for Interfacing MQ-9 Gas Sensor with Arduino:

S.no Component Value Qty
1. Arduino UNO 1
2. Gas Sensor MQ9 1
3. Red LED 1
4. Resistor 1KΩ 1
5. Breadboard 1
6. Jumper Wires 1

 

Schematic

Make connections according to the circuit diagram given below.MQ-9 Gas Sensor with Arduino-Circuit-Schematic

Wiring / Connections

Arduino MQ9 Gas Sensor LED
5V VCC
GND GND -ve with Resistor
A0 A0
D8 D0
D2 Positive