Hi there, I am new here so please be gently... :slight_smile: I have a problem to make working together UNO, W5100 and manual button which call the interrupt (attachInterrupt()) that controls the relay. UNO and W5100 check a device on the network and if cannot connect to it the relay is started. …

UNO + Ethernet shield + interrupts

ieee488 May 3, 2018, 2:29am 2

If you are connecting the relay to the Arduino, that is very bad.

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