Hi, I've got a problem with inputs being very unstable. i defined the inputs as INPUT_PULLUP. at 3 of my arduino's there is no problem (Wire length < 1m) but at one of my arduino the wire length is +/- 5m and all 6 of the inputs are constantly switching. (at this arduino i've got also 6 inputs …

unstable inputs

Wawa August 21, 2016, 12:39am 8

A simple 100n capacitor from input to ground (on the Arduino side) also fixes most problems.
Leo..

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