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Air Quality Monitor

This is an Air Quality Monitor which will display data such as the temperature, pressure, and relative humidity on an screen using the LittlevGL graphics framework and the RIOT operating system.

Example board setup

The application works on any board that has an screen and some sensors attached to it. However the recommended and most tested setup is with:

• The ESP32-WROVER-KIT board, which has a built-in ILI9341 screen.
• A BME280 I2C Humidity/Pressure/Temperature sensor.
• A GP2Y1010AU0F Compact Optical Dust sensor.

The wiring of the BME280 sensor to the ESP32-WROVER-KIT is as follows:

BME280	ESP32-WROVER-KIT
VCC	Any 3.3V pin
GND	Any GND pin
SCL	IO27
SDA	IO26

Depending on the breakout board for a BME280 sensor you may need to change the I2C address directly on the Makefile file.

The wiring of the GP2Y1010AU0F dust sensor to the ESP32-WROVER-KIT is as follows:

GP2Y1010AU0F	ESP32-WROVER-KIT
VCC	Any 3.3V pin
GND	Any GND pin
ILED	IO22
AOUT	IO34

• ⚠️ the dust sensor normally uses 5V to operate, Waveshare breakout boards can be plugged directly to a 3.3V supply.

Compiling and flashing the application

To compile the project you may need to first install required tools, on the case of an ESP32 board you can find instructions here:

• RIOT ESP32 Toolchain

Then you may need to clone the RIOT-OS repository on a different path than this project that you can reference through the RIOTBASE environment variable, example:

cd $HOME
git clone https://github.com/RIOT-OS/RIOT
export RIOTBASE=$HOME/RIOT

As the application works without modification on the esp32-wrover-kit board. To build, flash and run the application for this board, just use:

make flash