CO2 multimon
CO2 monitor with support for different sensors, displays and microcontrollers.
Firmware and the printed circuit board include support for all of these components. No special boards or firmware versions are needed. Sensors and the display are automatically detected by the firmware.
Supported CO2 sensors
- SCD30
- MH-Z14A, MH-Z19B
- T67xx
Supported displays
- 1.8" SPI TFT (ST7735 controller)
- 1.3" OLED (must have the following pinout: Vdd, GND, SCK, SDA - most 0.96" OLED displays will not work!) Note: Try to get the 1.8" TFT instead of the OLED. OLED displays will 'burn out' after approx. 1 month of continous use. Therefor OLED support is meant as a makeshift if you cannot get the TFT.
Supported microcontrollers
ATMega328P 'Nano V3' Boards
For this variant you need to solder a few 0805 resistors and 3x SOT-23 components to side B of the PCB.
STM32F042K6T6
Fot this variant you need to solder the LQFP-32 controller, a SOT-23 component, the micro-USB connector, a 1210 fuse and a few 0603 passives to side A of the PCB.