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Air Quality Monitor with RP2040

(for CO2, TVOC, Temperature and Humidity)

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I am working on an air quality monitor device using the stamp-size micro-controller RP2040-Zero. This is a mini version of RP Pico. It fits small project better because you don't need to use all the GPIO anyway. You will have a compact design using this. More important is the price, this one is cheaper that the original Pico. This is an upgrade version of the air quality monitor device here https://www.instructables.com/Air-Monitor-With-RP2040-Zero-SSD1306-Oled-Screen-a/ I have tested different types of sensor for the job. In this version I used * SHT31 humidity and temperature sensor * SGP30 air quality sensor (CO2 and TVOC) The results are shown on SSD1306 oled screen. You can download all the code from my Github https://github.com/hongloan/RP2240-Zero-air-monitor

RP2040ZeroOledSGP30_bb.png

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  • 1 × RP2040-Zero microcontroller This is a mini version of RP Pico. It fits small project better because you don't need to use all the GPIO anyway. You will have a compact design using this. More important is the price, this one is cheaper that the original Pico.
  • 1 × SHT31 This Humidity and Temperature sensor is popular thanks to the accuracy and repeatablity. It is much better than DHT11 or DHT22 which are usually come with beginner kit.
  • 1 × SGP30 Multi-gas (VOC and CO₂eq) sensor.
  • 1 × 0.96" in. oled SSD1306 In this versio I used the 2-colors yellow and blue, you should update the address of the screen in the ssd1306.py (line 105) to 0x3D instead of 0x3C

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