Hi all I write from very inexpert with programming...
I have an arduino nano and i would like to control an alarm buzzer ( it should buzz every 2 sec on for 300 millsec)
this buzzer absorb 140 ma (i know each output limit of arduino is 40ma) .... i don't want to use a relay (for space problems) , i thought i can attach the red wire to four digital output pin, so it will be possible to give until 160 ma... is it right or maybe i had to use something better ?
btw i have a lipo battery 7,4 v to power the nano and eventually the buzzer (with a transistor ??)
it's not a problem about sketch, it more , what to use and connect
be patient, "i'm not so expert :D " thanks in advance Andrea