papra-pcb-firmware
Firmware is intended to be loaded on this PCB: https://github.com/tetrabiodistributed/PAPRA-PCB
Use the following arduino settings, change the chip to match the one you are using.
Note: for ATtiny204 and ATtiny214 have 2K flash memory for program space. The preprocessor for TWOKFLASHCHIP must be uncommented prior to compiling. See Line 9.