Indoor Air Quality Meter

Simple project to check the air quality in your house.

Since we stay/work from home a lot lately, it might be a good idea to monitor the quality of the air and remind yourself when it’s time to open the window and get some fresh air in.

Step 1: Parts and Tools

Parts

Tools

Soldering iron

Step 2: Wiring Diagram

Wiring Diagram

Step 3: The Code

The code is available here: https://github.com/zangaby/ESP8266_BME680_air_quality

Based on https://github.com/3KUdelta/heltec_wifi_kit_32_BM…

Calculates IAQ with a BME680 sensor.

Reading of raw temperature, humidity and gas resistance Allow offset for temperature calibration Automatically calculate respective humidity using the August-Roche-Magnus approximation Calculate IAQ from temperature, humidity and gas resistance following Dr. Julie Riggs, The IAQ Rating Index, www.iaquk.org.uk

Code for those who are interested in using a BME680 sensor via I2C and Adafruit libraries to calculate IAQ without the proprietary libraries from Bosch.

Adafruit´s library: This is a library for the BME280 humidity, temperature & pressure sensor Designed specifically to work with the Adafruit BME280 Breakout —-> www.iaquk.org.uk These sensors use I2C or SPI to communicate, 2 or 4 pins are required to interface. The device’s I2C address is either 0x76 or 0x77. Adafruit invests time and resources providing this open source code, please support Adafruit andopen-source hardware by purchasing products from Adafruit! Written by Limor Fried & Kevin Townsend for Adafruit Industries. BSD license, all text above must be included in any redistribution

Libraries needed:

ThingPulse SSD1306 (https://github.com/ThingPulse/esp8266-oled-ssd1306)

General Adafruit Sensor (Arduino Library Manager)

Adafruit BME680 (Arduino Library Manager)

SoftwWire Steve Marple (Arduino Library Manager)

AsyncDelay Steve Marple (Arduino Library Manager)

Step 4: Connect Everything

OLED
VCC – 3.3v

GND – GND

SCL – D1

SDA – D2

BME680

VCC – 3.3v

GND – GND

SCL – D1

SDA – D2

Since both the sensor and the OLED are connected using I2C, they are connected to the same pins. In order to do that you can cut a dupont cable in half, and solder the cables to have some Y shaped cables.

Step 5: ​Further Ideas

Further Ideas

  • Send the data to MQTT/Blink/Thingspeak
  • Add a battery

Hope you enjoyed this project and if you have any questions feel free to ask.

Source: Indoor Air Quality Meter

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