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[on:]

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)

[Reply #1 on:]

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

[Reply #2 on:]

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

[Reply #3 on:]

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

[Reply #4 on:]

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

[Reply #5 on:]

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

[Reply #6 on:]

Thanks CrossRoads.