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Speedy Builder5	10/02/2021 20:49:08
2878 forum posts 248 photos	I have an Arduino circuit for driving stepper motors and using a second Arduino for the display from Electronoobs LINK The grounds are all tied together, but should the 5volt lines be commoned between the two Arduinos. The schema in the link shows an Arduino Uno and a second Nano, but I will be using 2 Nanos both being powered by an external 12volt regulated DC supply. Help Bob
Martin Kyte	10/02/2021 21:10:05
3445 forum posts 62 photos	Keep the +5V local to the stuff connected to each nano. regards Martin
duncan webster	10/02/2021 21:58:30
5307 forum posts 83 photos	Or fit a 7805 and power everything from that, the Arduino internal regulators are not the most robust devices as I know to my cost
Speedy Builder5	11/02/2021 06:41:35
2878 forum posts 248 photos	Thanks for the replies. I will keep the 5v separate for the time being Duncan, using the 7805, you would then feed that directly to the 5 volt pin on both Arduinos ? and in effect tie both of them to the same 5v level. Bob

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