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Steppers won't run without USB - Printable Version

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Steppers won't run without USB - gamike - 07-26-2015 02:54 AM

My Robot is no longer working properly. When hooked up to a battery, the brain shield appears to power up. The WiFiBee connects and the Leonardo appears to be powered, but the stepper motors will not turn.

If I plug the USB plug into the Leonardo and THEN plug in the battery, the stepper motors WILL turn.

I checked the voltage coming off of the 7805 voltage regulator and it is giving me high voltages between 5.8 and 6.8 volts if the USB is not plugged in. If I start the power up procedure with the USB plugged in and then plugging in the battery, the voltage from that 7805 is 5 Volts.

I tried swapping the 7805 for another that I have lying around and it has the same problem, so I think the 7805 is good.

Does anyone have any suggestions?


RE: Steppers won't run without USB - JohnQ - 08-06-2015 08:15 PM

HI Gamike,
Sounds weird.
Can you connect to the WIFI?
There are to ways to power up the Brain Shield, using the Leonardo Vin connector and the B-robot Shield Vin. Try both. What is the voltage of the battery you are currently using?