Power supply for relay

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i have project involving relay, pir sensor, , ac fan. works intended ugly, ugly, 2 wall warts, 1 supplying arduino, relay, , wire fan, coming power strip. single wire ac outlet box more elegant.  assume arduino , relay can't supplied single wart via transistor, or in case, tip120?  mains power accessed single terminal inside project box 2 warts? ignorant question, coming wall gives me willies!

you have not said voltages , currents using.

i can guess relay requires more 5 v and/or more 30 ma.  perhaps should different relay.

if relay used 5v , <30 ma can run directly arduino pin without separate power supply or transistor driver.  if uses 5v , >30 ma (up 400 ma) can drive arduino transistor.


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Power supply for relay


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