Hi all, I've got a 4wire bipolar 20 step stepper from a floppy drive, I have it running nicely using an L293D and the stepper library running through the standard bipolar wiring diagram on the arduino tutorial. Both of my enable pins are tied to arduino +5v, everything works nicely for this stepper.
I've also got a 48step bipolar pulled from a printer, its rated at 24V, so before wiring up I tested the motor using 4xAA batteries (4.8V) and a 12V battery, mainly to see what kind of holding torque it had at lower voltages and if it would even respond at ~5V, both were adequate.
As I understand things to put 12V through the L293D I put + from the battery to pin8 VS on the L293D, where exactly does battery - go? I've tried multiple points on the l293/circuit, 4,5,12,13, the - rail on the breadboard before and after any other connections to - rail, I'm farily stumped as to what else to try. I don't get any response from the stepper at all, no chatter, no movement at all. the l293 circuit is still working correctly from the arduino end as each input pin on the l293 has a led attached that indicate which coils are energised.
any clues as to what I'm doing wrong?