I seem to be having a problem getting my L293D working with my arduino...
I am designing a circuit that will eventually allow me to power central locking motors in my car, and I am currently using a L293D in the circuit.
I tested the basic system on a breadboard, with the L293D hooked up to the arduino and a basic motor I found for testing. Everything worked fine.
I've now soldered the whole thing down to a PCB, but for some reason it no longer works =/
The strange thing is... is that the Arduino is sending out the correct voltages (Enable 1 is HIGH, and the two control pins are alternating between HIGH,LOW and LOW,HIGH). Only one motor is connected.
On the motor output of the L293D, I have the correct voltages coming out also, +12v, then -12v. As soon as I connect a motor however, the only thing that happens is the motor performs a feeble jerk, and the arduino resets itself. It is almost as though the power supply (an external variable voltage/amp box thingy - I cant remember the name), is not putting out enough power, yet according to all my meter readings it is.
The arduino is being powered through VIN through a voltage regulator connected to the external supply. I have also tried USB, but nothing different happens. All grounds are connected together; all four ground pins of the L293D are wired to the arduino and external ground.
I have used my multimeter to make sure that no pins are shorting together and that nothing is touching where it shouldn't be. I should also note that when connected directly to the power supply the motor works fine.
I have no idea whatsoever why this fails to work... so if anyone could help it would be much appreciated!
...Oh and happy new year everyone! insert party emoticon here