Loutre-LNO / CO2_sensor

CO2 measurement

CO2 measurement with ESP32 and SCD30 sensor

Features

• Measurement every 5 seconds of the CO2 rate in the air, the temperature and the humidity rate
• Two display modes, navigation with buttons
  • Display of instantaneous values ​​with an RGB color code proportional to the CO2 level
  • Display of a graph with the last 200 measurements
• Calibration (long press on button 2)
• Standby (Deep Sleep) (long press on button 1)
• Battery level monitoring
• Automatic shutdown if battery low

Parts list

• TTGO T-Display (ESP32 + 1.14" screen)
• Sensirion SCD30 CO2 sensor
• (Optional) 3.7V Lithium Battery

Wiring

ESP32 T-Display	SCD30
3V3	VIN
GND	GND
GPIO-22/SCL	SCL
GPIO21/SDA	SDA

Inspired by

• https://github.com/fvanderbiest/arduino-sketches/tree/main/sketch_scd30_ssd1306_neopixel
• http://nousaerons.fr/makersco2/

Licence

Published under MIT License