Skip to content

README.md

Latest commit

 

History

History
85 lines (61 loc) · 2.36 KB

README.md

File metadata and controls

85 lines (61 loc) · 2.36 KB

MQ-7 Based Carbon Monoxide Monitoring System using ESP32 (MicroPython)

Project Overview

This project demonstrates a Carbon Monoxide (CO) Monitoring System using the MQ-7 gas sensor interfaced with an ESP32 microcontroller programmed in MicroPython.
The system reads analog values from the MQ-7 sensor after a warm-up period and continuously monitors CO presence in the environment.

Objectives

  • Interface MQ-7 CO sensor with ESP32
  • Read and process analog sensor data using ESP32 ADC
  • Monitor real-time CO level variations
  • Understand gas sensor warm-up and averaging concepts

Components Required

  • ESP32 Development Board
  • MQ-7 Carbon Monoxide Gas Sensor Module
  • Breadboard
  • Jumper Wires
  • USB Cable

Circuit Connections

Circuit Diagram

MQ-7 Sensor Pin ESP32 Pin
AOUT GPIO 35
VCC 5V
GND GND

Working Principle

  • MQ-7 sensor changes its output voltage in the presence of Carbon Monoxide.
  • ESP32 reads this voltage using its built-in 12-bit ADC.
  • A 60-second warm-up is provided before measurements.
  • Multiple ADC readings are averaged to reduce noise.
  • The averaged value is displayed via the Serial Monitor.

Technical Specifications

  • ADC Resolution: 12-bit (0–4095)
  • ADC Attenuation: 11 dB (0–3.3 V range)
  • Sampling Method: Averaging of 10 readings
  • Programming Language: MicroPython

Output

  • Displays real-time averaged ADC values of the MQ-7 sensor.
  • Increase in ADC value indicates higher CO concentration near the sensor.

Learning Outcomes

  • ESP32 ADC configuration using MicroPython
  • Interfacing gas sensors with microcontrollers
  • Handling sensor warm-up requirements
  • Noise reduction using averaging techniques

Future Scope

  • Add LED/Buzzer alerts for high CO levels
  • Convert ADC readings to CO concentration (PPM)
  • WiFi-based monitoring using ESP32
  • Integration into a complete Air Quality Monitoring System

Author

Kritish Mohapatra
MicroPython | ESP32 | Embedded Systems | IoT Projects
GitHub: [https://github.com/kritishmohapatra]

⭐ Support

If you like this project, give it a ⭐ on GitHub
and feel free to fork or improve it!