I'm trying to power up to 100 Arduinos that will be spread across a 25m wall using a single power line.
The idea is each Arduino will have a few a few buttons, leds & an oled screen and will all communicate to a master server using rs485.
====[A0]====[A1]====[A2]====[A3]====[A4]== ... ==[A99]
I've already followed this brilliant post http://www.gammon.com.au/forum/?id=11428 to implement the data connection using an rs485 bus.
However I'm struggling to understand how I could power multiple Arduinos from the one line without affecting the quality of the data bus.
Would I be able to use a 48v power rail with buck converter for each Arduino?
Would I have to isolate each Arduino and rs485 driver (my concern is the length of the wire will create different ground potential and effect the quality of the data bus)?