Reply To: EZIO2X4 – How to use I3/I4 as simple "dry contacts" 2017-12-21T11:23:13+00:00

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Anonymous
Post count: 192

Yes a pull up would be needed.
Connect a 10,000 Ohm 1/4 Watt resistor from I3 to +5 volts and a 10,000 Ohm 1/4 watt resistor from I4 to +5.
Then connect the dry contact switch from I3 and Ground and the other dry contact switch from I4 and Ground.

A 4,700 Ohm resistor would also be fine for the pull up resistors.