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affordable-air-quality-sensor-7cdd11-en.md

1. Assemble the Circuit

Mq-135

A0 to A0

VCC to 5v

GND to GND

RGB LED

R to 11

G to 10

B to 9

GND to GND

2. Upload the Code.

The Mq-135 sensor will measure the air quality and set the RGB to a color, feel free to change the color and the elseif statments.

EXPANDED TECHNICAL DETAILS

Low-Cost Environmental Health Monitoring

This project provides an accessible solution for monitoring indoor air pollution and hazardous gas concentrations.

  • MQ-135 Gas Correlation: The Arduino monitors the analog output of an MQ-135 sensor. The firmware applies a logarithmic conversion to estimate the CO2, Alcohol, or Smoke concentration in parts per million (PPM).
  • Traffic-Light Health Indicator: Uses three LEDs (Green, Yellow, Red) to categorize the air quality. Green for "Fresh," Yellow for "Warning," and Red for "Hazardous," providing an instant visual health check for families.

Reliability

  • 60-Second Preheat Timer: Includes an LCD countdown on startup, ensuring the MQ-135's internal heater reaches its operational temperature for accurate data reading.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Affordable air quality sensor"
description: "A Arduino Air quality sensor using an MQ-135 Sensor and a RGB LED"
author: "eaglestrike66"
category: ""
tags:
  - "environmental sensing"
  - "health"
  - "data collection"
views: 1550
likes: 2
price: 870
difficulty: "Easy"
components:
  - "1x RGB Diffused Common Cathode"
  - "1x Solderless Breadboard Half Size"
  - "1x Plastic Enclosure, Project Box"
  - "1x Arduino UNO"
  - "1x Jumper wires (generic)"
  - "1x MQ-135"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles: []
documentationLinks: []
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seoDescription: "Build an affordable Arduino air quality sensor using MQ-135 Sensor and RGB LED. Simple DIY project for environmental monitoring."
videoLinks: []
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/affordable-air-quality-sensor-7cdd11_cover.jpg"
lang: "en"