Need Advice on Max Length of GPIO Input Leads - Raspberry Pi Forums

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my home controller system spreading on house...

gpio outputs go via short leads driver boards, inputs come buttons , other sensors 10m away, , need go further.

long cables go simple buttons, or mechanical relays (e.g. in pir motion detectors.) configured internal pull-up resistor. add electronic pir detectors have direct 3.3v output; came without specs, don't know how far can reliably go, issue.

far seems work ok. there should doing protect inputs damage or filter out noise? should using opto-isolators?

a series resistor of few kohms @ rpi end prudent protection. pull-up (or -down) should @ non-rpi end of resistor. if inputs low frequency toggles capacitor gpio pin ground can reduce noise. possible, earth rpi's ground not elsewhere.


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