Hey guys i'm trying to interface a unipolar stepper motor with a 89s52 and the program runs fine in proteus, now the problem i'm facing is that when the pin is high from the controller this should invert the signal and move the stepper motor but my problem is in hardware, when i check the controller through DMM i see i'm getting 3 to 5V from the output pin of the controller but when i connect a jumper to the uln2003A the voltage goes down to 1V or 1.7V and doesnt work. Without connecting the inverter its fine, can anyone please tell me why is this?? and i have used the following fig to just connect the stepper motor **broken link removed**
I have been using the ULN2003A, but I always pin 10 open.
What a difference 10 ULN2003A pin in the open and let the connecting pin 10 with vcc
Such series I have ever tried, but the motor is not strong, My STEPPER motor 0.45A. after I replace it with L297, until now a good motor