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Hi i had follow your built instruction and everything is working fine (thanks!). the control of my car with the app works great, except that my car stop after moving for about 100cm. then i let it rest for about 1 minute, and it can move again. same as turning and spinning. I am suspecting is my battery problem. i am powering my arduino board with a 9v Li-ion rechargeable and another 9v li-ion rechargeable for the adafruit motorshield v1. The power jumper on the motor shield is remove so that it only received power directly from 2nd power source and not from arduino board.I am using 2 6v-9v motor with Tamiya Dual Gear Box. any idea why it stop and need to rest to continue? Thanks