Using Ground from ICSP

I need more ground pins for my project than the UNO supplies. Can I use the ground pins from the ICSP header?

Yes.

Yes, but only for sensors and other low-current devices. Don't use it for a motor or servo.

Thanks! This will be used for a switch.

MorganS:
Yes, but only for sensors and other low-current devices. Don't use it for a motor or servo.

But that does apply for every pin on the Arduino :slight_smile:

It's not a normal way but I have once used the digital Pin as a GND, I have simply made it LOW and used it as a GND, worked perfectly.

jackthom41:
It's not a normal way but I have once used the digital Pin as a GND, I have simply made it LOW and used it as a GND, worked perfectly.

Well no, its wasn't perfect, it was good enough for your circuit no doubt, but a pin held low isn't ground, its about 40 ohms to ground, and could be damaged by currents over 40mA. Not appropriate for suppling power ground to anything, just signal ground.

This is of course, an XY problem. :roll_eyes:

Clearly, the problem is how the project is being constructed in general. :astonished:

You can simply splice wires as well... and connect dozens of ground connections to one ground pin (just make sure the total current is not too much).