CO2 traffic light - only PCB

The CO2-Ampel shows a color according to the application and the CO2 concentration.

On powerup the sensor needs approx. 30s until a valid value is displayed (standard measuring interval: 3s).

The light sensor is checked every hour and when it is dark, the brightness is reduced and the measuring interval is increased to 30s.

for covid prevention (preinstalled firmware)

• up to 799 ppm -> green
• 800 to 999 ppm -> yellow
• 1000 to 1199 ppm -> red
• 1200 to 1399 ppm -> red flashing
• 1400 ppm and higher -> red flashing + buzzer

against tiredness

• up to 999 ppm -> green
• 1000 to 1199 ppm -> yellow
• 1200 to 1399 ppm -> red
• 1400 to 1599 ppm -> red flashing
• 1600 ppm and higher -> red flashing + buzzer

The controller comes with a Arduino compatible bootloader and so you can flash or modify the firmware via the Arduino IDE.

On Board you will find:

• Microchip SAMD21G18 - Cortex-M0 microcontroller 
• 4 pcs World Semi WS2812B - RGB LEDs
• Qwiic compatible I2C connector
• Piezo buzzer
• USB-C connector for power supply and firmware updates

The set contains assembled and tested PCB (without SCD30 sensor).