My project is currently running on POE using a TP-Link splitter that can output 5,9 or 12V. The RFID keypad is supposed to take 12V but works OK on 9V and the Arduino can handle 9V in too - there's a temperature sensor inside the enclosure to make sure things aren't getting too hot (it's been runnin…

Stepping down voltages (which PSU?)

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