24VDC and 5VDC to the same 0V

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so trying use atmega328 , arduino software control 24v industrial equipment relays.  have 24vdc power supply i'm converting down 5vdc atmega328 , associated parts.  sake of ease have 0v end of components, 24v , 5v, going same 0v line.  right? or going blow myself up?

that right.  entire circuit need same reference point gnd connect grounds together.  no puppies should harmed  :)

geoff


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