CO2 traffic light for rooms
green: under 700 ppm CO2
yellow: between 700 and 999 ppm CO2
red: over 1000 ppm CO2 (or below 300 ppm)
Parts:
- Arduino Uno (https://www.arduino.cc)
- Relais Shield (https://de.aliexpress.com/item/32982923249.html)
- LED Traffic Light (https://de.aliexpress.com/item/4000282316360.html)
- MH-Z19B CO2 Sensor (https://de.aliexpress.com/item/4001122072228.html)
Libraries
Photos
