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This question may be more appropriate for EE stack exchange. It will all depend on how beefy is your 5 V power source, on how much current the relay uses, and on your supply decoupling capacitors.Edgar Bonet– Edgar Bonet2018-08-04 08:48:58 +00:00Commented Aug 4, 2018 at 8:48
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Why not use a solid state relay? Often they work on 5V/the output pins of a microcontroller.aaa– aaa2018-08-04 09:58:27 +00:00Commented Aug 4, 2018 at 9:58
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@Paul: most solid state relays are for AC (triac-based) and won't work in automotive application. a MOSFET or MOSFET-based SSR designed for DC would work.dandavis– dandavis2018-08-04 19:43:26 +00:00Commented Aug 4, 2018 at 19:43
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@EdgarBonet shooting for 5v 500mA, the relay I mentioned has a coil draw of 40mA and attiny is around 13mAdawm– dawm2018-08-04 21:34:43 +00:00Commented Aug 4, 2018 at 21:34
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