Gnd pins

Hello,

I have a question : Well, is there any difference between the ground pin which is next to the digital pins and the other two ground pins ?

No, they are all electrically the same.

Lefty

Ok, thank you very much !

Power group ground pin is a digital ground. ground pin close to aref is an analog ground.

There is no difference is you don't use "AREF".

If you use "AREF" you have to connect pin ground close to aref to a good ground plane.

Thanks 68tjs for your reply!