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The L293D has about a 2.6V drop on the output pins. That means for a 3V motor you need to provide about 5.6v for it to run at full speed. 5V will work, but it will run slightly slow and underpowered. 9V batteries are useless. Only any good for very low power applications like smoke alarms. They just can't provide the current you need. Instead you need to be ...


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You could also use a 4 channel relay for making the motors work and they can be independent of using power from arduino and is really effective, I sometimes use it for high voltage optocoupling and can be used for small ones too all you need to do is build logic and everything would work fine I assume you know how to reverse polarity on a dc motor. Relays ...


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