Hi, Here on tutorial: http://www.arduino.cc/en/Tutorial/StepperBipolar
I read "...These motors can be found in old floppy drives and are easy to control...".
The motor I got out of floppy was little different. I first setup from another Arduino tutorial I can't find link of it, the L293D circuit. I used diods for back EMF as it is usual, and the included example of Arduino IDE using digi-pins of 8-11. It works, but the chip (brand new for the project) and motor both get hot very fast.
I first decided to go back to the original tutorial with ULN2003, but the motor there has 5 wires with vcc separated, while my stepper has only 4.
I thought to ask here before changing setup that may be I'm doing something wrong with L293D that motor and chip get that hot?
I checked with datasheet of L293D and I've nothing in difference with. I'm not using heat sink / fan, but well, anyway it should not get that much fast so hot (max around 15 seconds and I can't touch the chip).
Also I'm using good isolated wires so no false contact.
Any idea please, where from the heat is coming from?
How I must go with the missing vcc wire of my stepper, if I get back to ULN2003 please?