Tying negative poles from two power supplies together

Thread Starter

tenorjazz

Joined Mar 15, 2013
2
I am building an Arduino circuit that will be driving high powered lights using Mosfets to do the switching. My question is, do you tie the ground from the Arduino to the negative pole of the high power battery to make a common ground for everything to work?
 

MaxHeadRoom

Joined Jul 18, 2013
20,000
Yes, If the Arduino is fed from the same source, otherwise it is optional, if isolation is required, then opto isolators can be used.
Max.
 

ErnieM

Joined Apr 24, 2011
8,019
I hate the term common ground here since you want to connect the digital stuff ground to the power stuff ground at a single point if at all possible.
 
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