If I have two Arduinos 50m apart and send a HIGH signal on one will it be received by the other even though it is so far away? Do i need a pull down resistor? assume using 1mm house electric wire. [image] Thanks all. Brendan

Log distance Signal

LarryD June 15, 2019, 7:06pm 5

BTW, using an opto coupler can prevent ground loop problems.

A 6N137/138 is a good choice.

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