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General Mach Discussion / Re: Unipolar stepper motor with ULN2003?
« on: July 08, 2010, 07:47:53 AM »
You need to current limit the supply to each coil to ensure it doesn't exceed 500mA per driver (series resistors in line with pins 13 - 16). Also you may need to heatsink the ULN2003.
Remember - the computers printer port (LPT) is fragile and it is always best to use a buffered or opto isolated BoB when experimenting like this.
Good fortune and don't make expensive smoke
Tweakie.
Remember - the computers printer port (LPT) is fragile and it is always best to use a buffered or opto isolated BoB when experimenting like this.
Good fortune and don't make expensive smoke
Tweakie.