Inaki Iturriaga

ARGENTINA • + Follow

wang hero111

AUSTRALIA
- 2
- 0
1

Components

	MQ135 air quality sensor module	x 1
	WeMos D1 Mini	x 1
	0.96" OLED Display	x 1
	18650 battery and holder	x 1
	slideswitch	x 1

Tools, APP Software Used etc.

	arduino IDE Arduino
	Soldering Iron Kit

Description

Air Quality Monitor

Welcome to our DIY tutorial on assembling an Air Quality Monitoring Device. This project is perfect for those interested in environmental technology and DIY electronics. Utilizing a custom PCB, this device offers a compact and effective way to monitor air quality in your immediate surroundings.

Disclaimer

This device is intended for educational and hobbyist purposes. It should not be used for critical health or safety decisions.

Applications:

Environmental Monitoring: Ideal for tracking air quality in homes, offices, or outdoors.
Educational Tool: Great for learning about sensors, microcontrollers, and data visualization.
Personal Health: Useful for those interested in monitoring the air quality around them.

Building Guide - Air Quality Monitoring Device:

Gather Your Tools and Materials

Custom PCB designed for this project.
Wemos D1 Mini microcontroller.
MQ-135 Air Quality Sensor.
Small OLED Display.
Slide Switch.
18650 Battery and Holder.
Soldering iron, solder, and flux.
Tweezers or small pliers.

Assembly

Prepare Your Workspace: Choose a well-lit, clean area to work in. Safety first!
Mount the Wemos D1 Mini: Fit the Wemos D1 Mini into its designated slot on the PCB. Solder it into place.
Attach the MQ-135 Sensor: Place the MQ-135 sensor onto its designated spot on the PCB. Ensure proper alignment and solder it.
Install the OLED Display: Align the OLED display with its spot on the PCB. Carefully solder the connections.
Set Up the Slide Switch: This will control the power to your device. Solder it onto the PCB.
Battery Connection: Place the 18650 battery in its holder and connect it to the PCB. Ensure secure and proper orientation.
Programming the Wemos D1 Mini
Install Necessary Libraries: Use the Arduino IDE to install libraries for the OLED display and sensor handling.
Connect the Wemos D1 Mini: Use a micro USB cable to connect it to your computer.
Write the Code: Develop code to read data from the MQ-135 sensor, process it, and display the readings on the OLED screen.
Upload the Code: Transfer the code to the Wemos D1 Mini.

Conclusion

You now have a fully functioning Air Quality Monitoring Device. It's an excellent opportunity to explore environmental sensing, data handling, and electronic design. Enjoy monitoring air quality and remember to calibrate your device for accurate readings. Happy building!

Code

Example code

Arduino

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET     -1
#define MQ135_PIN A0

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);

  // Initialize OLED Display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();

  // Display initial text
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println(F("MQ-135 Air Quality"));
  display.display();
  delay(2000);
}

void loop() {
  int sensorValue = analogRead(MQ135_PIN);
  float airQuality = calculateAirQuality(sensorValue);

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);

  display.println(F("Air Quality (ppm):"));
  display.print(airQuality);
  display.display();

  delay(1000);
}

float calculateAirQuality(int sensorValue) {
  // Example conversion formula - this is an approximation and should be calibrated
  float sensorVoltage = sensorValue * (5.0 / 1023.0);
  float airQuality = (sensorVoltage - 0.6) * 100;
  return airQuality;
}

CAD-Custom parts and enclosures

Part 1

AQM1.stl

Part 2

AQM2.stl

Download Gerbers Download BOM(Bill of materials)

Nov 30,2023

898 views

Air Quality Monitor

Portable DIY Air Quality Monitor: Track your environment's health in real-time!

898

Published: Nov 30,2023

Download Gerber file 8

BOM(Bill of materials)

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