Here is my lab for controlling a motor using the arduino. I have attached a video of me turning on a motor using a 12 V external power supply. The video is kind of raw, and I did end up building the gearbox to use with the motor but in the end I didn't really have enough time to get the whole thing on video again with the gearbox. I was having a bit of trouble getting the motor to start with a 9V DC supply, and luckily I had a 12V DC supply lying around here so I plugged that in and powered it all up and it worked just fine. I'm not really sure if I fully understand why the 9V supply didn't work, because the motor was rated for 3 Volts, so 9 would have been just fine to get everything up to speed.
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