Ground in schematics to which ground the battery or arduino ?

Using Arduino General Electronics
1

I have a read a topic on L298 H bridge and i was given this schematic... The schematic has 4 grounds which grounds do I connect to arduino (5v) and which to the other power supply for the motors (12v battery)

L298.jpg
L298.jpg808×1060 106 KB

2

All grounds need to be connected.
Preferably all to the same point, the battery - , but that is not always practical.

3

Thanks for replying in a short time :), So I can connect all the grounds to the same ground (arduino 5v or bateery 12v) ? Is that true ? Thanks in advance :slight_smile:

4

Yes. Connect all grounds. Ground is used as the reference point for all signals.
Battery -
Arduino Ground
Any signal grounds

5

I thought that you couldn't (without some more components) connect a v5 ground and a different voltage ground... Am I wrong on this?

6

All grounds need to be connected unless the portions of the system are electrically isolated. I don't see that here.

7

Thanks CrossRoads.