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« on: July 22, 2013, 12:52:39 PM »
I am having difficulty getting my Tiny Shield Motor driver to work. I suspect that it has to do with the ground connections.
I know that my code is running since I added an LED Shield and it is blinking as programmed. I am using 2 AA batteries and measure 3VDC going into the Motor Driver, but the motor is not turning (it works on 3VDC).
I followed the wiring instructions on the Tiny-Circuits site, copied below:
◦ "Step 3: Add a wire between the GND pin on the Motor x4 TinyShield and the negative terminal on the battery holder."
My Tiny Duino has a coin battery holder, but I am using an external battery. The negative terminal was “hidden” under the battery holder clip, so I used a cardboard piece to press a black ground wire into the coin space. I checked that there was indeed a 3VDC difference between the ground wire and positive terminal.
◦ "Step 4: Add a wire between the VM pin on the Motor x4 TinyShield and the positive terminal on the battery holder."
I soldered a red wire to the spot where the coin holder is attached to the Tiny Duino.
◦ "Step 5: Add a wire between the positive connection on the battery holder and the ‘+’ hole on the TinyDuino processor Board. This will connect the VM and VCC power supplies together."
I soldered a red wire to the ‘+’ on the Tiny Duino board.
I then tied the black wire to the AA batteries ground and into the Motor Driver GND. I tied all red wires together and the AA battery positive, and tied it to the Motor Driver VM input.
Nothing was working so I tried connecting the ‘-‘ on the Tiny Duino to the rest of the grounds but that did not help either.
I have used H-bridges and motor drivers before, but have spent 2 days on this and am stuck. I already tried a second motor driver shield. Any advice would be much appreciated.
Thanks
Nate