Hi, I have followed the instructions for the bipolar stepper motor from this link Arduino and Stepper Motor Configurations | Arduino Documentation. The motor runs when only the Arduino is powered with 5v. When I add a battery of more than 5v to the circuit the motor starts stalling. Can you explain why this happens. The motor I am using is a Nema 17 stepper motor and the spec says it needs 12v.
What kind of battery are you using?
Poste your project wiring e code.
Nema17 is a mounting plate size. It has nothing to do with electrical specifications.
The 4-wire bipolar stepper part of the article assumes a high-impedance stepper, which most of them are not. Common low voltage/high current stepper motors need 12-24volt supplies and current controlled stepper drivers. Not a common H-bridge like the SN754410/L293D.
So which stepper motor do you have.
Leo..
Please post a link to the datasheet or product page for the motor, or at least the model number on the nameplate.
The 754410 will go into thermal shutdown if overloaded. You may need to get a better driver,
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