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Author Topic: Ground in schematics to which ground the battery or arduino ?  (Read 533 times)
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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)


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All grounds need to be connected.
Preferably all to the same point, the battery - , but that is not always practical.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Thanks for replying in a short time smiley, So I can connect all the grounds to the same ground (arduino 5v or bateery 12v) ? Is that true ? Thanks in advance smiley
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Yes. Connect all grounds. Ground is used as the reference point for all signals.
Battery -
Arduino Ground
Any signal grounds
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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I thought that you couldn't (without some more components) connect a v5 ground and a different voltage ground...  Am I wrong on this?
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All grounds need to be connected unless the portions of the system are electrically isolated. I don't see that here.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Thanks CrossRoads.
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//LiNK

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