PR2040 CO2 monitor build guide Chapt. 0 Setup Raspberry Pi Documentation - MicroPython Raspberry Pi Documentation - The C/C++ SDK Chapt. 1 Hello World 1-1 Blink; beginning of everything 1-2 Hello World by serial communication Chapt. 2 Device communitcation 2-1 Hello World on OLED 2-2 Senor input Chapt.3 CO2 monitor 3-1 Diplay data 3-2 Display chart