Concern about common ground with different sensors

Hello!

So basically I’m rebuilding a PSU that I made when I started my career (1.2v to 24v - 1A) and instead of using the old analog voltmeters, I’m designing an Atmega328 based multimeter. I already have all the design completed but during a check up of all the circuitry I noticed that all the grounds were connected to the main ground on the transformer, there is any problem with that? I’m a little concerned with the acs712 being connected to the same ground as the main variable DC outputs.

In the attachment you can find a basic layout of the PSU.

I’m open to any suggestion, feel free to comment :slight_smile:

Sebastian

ensure the datalines (to arduino) dont exceed 5V avoid ground loops (choose common point) looks OK to me