I've been given a motor to build into a project i'm working on to make a fake bomb. I've got the whole process working, from wire test, through to a solenoid popping balloon. (here's the lovely little sparkfun display doing it's thing: http://designersfront.com/dwfe/BOMB_DISPLAY.MOV
I just can't get the motor to work. I've tried a few tutorials, and I've wired up a couple of motors before (typically steppers), using this H-bridge and the texas instruments SN754410. It makes me realise I perhaps don't even know what I'm on about. What are the four wires on this motor actually doing? Does anyone recognise this motor, know where to find a datasheet?
I've tried wiring up as recomended here: http://luckylarry.co.uk/arduino-projects/control-a-dc-motor-with-arduino-and-l293d-chip/
and with the SN754410 using an external power source.
As you can see from the attached image it came with a motor driver circuit already wired that they informed me worked fine with it, but I can't see where to put the external current in, as all four corner pins are connected to 5v on the arduino.
Code wise I've just been trying combinations of writing the four pins high and low, with very little effect. I have been able to get it going forward jerkily a few times, but not really been able to make sense of whats happening. Do I need PWM or perhaps are the wires doing something more complicated than just back and forward?