Server 16 Raspberry Specs

[admin]

Power supply: DC12V 2.5A
Digital input: 16CH with optocoupler isolation
cable MAX: 500 meter
dry contact signal
if want connect input voltage:
logic "1": input DC0V
logic "0": input DC12V

free GPIOs from CM4 pins:
GPIO16
GPIO17
GPIO20
GPIO21
GPIO22
GPIO23
GPIO24
GPIO25

here are CM4 hardware resource: https://www.kincony.com/forum/showthread.php?tid=5418
Do you want use install home assistant?