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  • How to use any relay with your arduino the safe way

    Not sure if all of these points are valid:1.) not enough voltage = use external supply or 5V relay2.) not enough current = almost any transistor will do3.) inductive transients = use flyback diode across relay4.) electromagnetic noise... was that ever problem in reality? i only had problem with noise on INPUT pins without properly set pullups. not on output...5.) safety in case of relay isolation breakdown... this is true... but i am not sure how dangerous relays really are... if you couldn't trust relay for isolation, how could you trust optocoupler? both are made for isolation... but well... both uses different techniques. i am not very sure about this...

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