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My Arduino Uno controls a couple LEDs in a watertight enclosure. I'm running wires from ground, a data pin and the 5V pin into the enclosure. The Arduino is powered through the DC jack.

What measures can I take to handle failure of the watertight enclosure, which would short-circuit the wires? Can i protect the Arduino, or at least prevent a fire?

  • simply put a fuse inline with the power jack, say 1 amp (if the LEDs aren't powerful). Also, water won't cause a dead-short, and with only 5v, you don't really have to worry about a fire, unless you're doing something weird you didn't mention. – dandavis Aug 17 '18 at 16:08
  • Nothing weird! Thank you. Do you mean to put the fuse right after the 5V pin? What would be an appropriate fuse for this? – Anna Aug 17 '18 at 16:19
  • Se this WONDERFULL vid (is just 8 mins!!!) – k.Cyborg Aug 17 '18 at 16:23
  • they make pre-assembled DC inline fuses (like these) if you don't want to solder in a fuse holder. The fuse should be sized as 1.5-2X your expected load in amps. – dandavis Aug 17 '18 at 16:26
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    @k.Cyborg Thank you, seems I hade several misconception about water. – Anna Aug 17 '18 at 17:30

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