Hi all, I have 4 Arduino linked together, sometime one of this can be power off but on its gpio can be a voltage that come from other Arduino. This can damage the chip. So I must to isolate all the digital input with optocoupler, but i don't know what is the best solution for the analog input, can y…

Tension on shutted down gpio

system October 7, 2012, 12:13am 7

Those diodes are rated 20ma. It would take over 200v to kill those diodes + 10k resistor.

Not to mention the low-pass filtered you got there.

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