View Full Version : stepper motor circuit...

08-09-2008, 10:31 AM
I have created the stepper motor circuit using the following link


the motor is in bipolar mode.. i am using Atmega16 micro controller..
the power supply to the motor is directly thru a Li Ion battery and the power to the micro controller is given thru IC 7805 using the same battery as input power..
but when i start the ckt, the 7805 gets heated up and the 7805 o/p becomes equal to the voltage of the battery which is 7 volts... This damaged my micro..
can u tell me what is the problem with my circuit?

08-09-2008, 01:35 PM
it would be better if you give complete circuit because problem might be very silly which may be difficult to get by description only....... from your description i don't think there is any problem if you have connected all ics and properly........
still you can try following:
1) use a zener diode across uC power supply
2) use a capacitor(>1uF) between motor power supply
3) check if 7805 is working properly

09-04-2008, 02:29 PM
Also make sure that you don't forget to put heat sink on 7805.

09-12-2008, 09:33 AM
Well saw that people still are having quite some doubts on the stepper motor post that i had put up. so i thot to make that abstact clear i better put the exact circuit and the code here.
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09-12-2008, 10:10 AM

where is your post, circuit & code??