Drill Motor Speed Controller Bracket

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Human: Harbor Freight drill motors are perfect for combat robot projects due to their incredibly low price tag of just $20 each, including an 18V Ni-Cd battery! The only challenge I faced was finding a motor controller that wouldn't break the bank at over $100 per motor. After some research, I managed to put together a reliable 30A setup for around $15 per motor and an additional $10 for an Arduino board that can support up to four motors. This motor controller boasts a 0-5V analog input, which is easily connected to the dual relay board to control the direction of each motor's spin. I've included a wiring diagram and links to two boards used in this project - they're just $28 when purchased through the provided links on eBay. Cordless drill: http://tinyurl.com/hc5fwsq This is the exact same cordless drill sold at Harbor Freight for $20. Motor Controller: http://tinyurl.com/MotorControl One thing to note about this controller is that it lacks master and slave mode capabilities, so you'll need to remove the potentiometer and run the yellow wire directly to the Arduino. Dual Relay Board: http://tinyurl.com/5vRelayBoard These boards can be found on eBay for just $4 each. I know they're rated at 30A while the controller is 40A, but short tests haven't generated any heat so far - I'll update this post with more strenuous testing results soon. Unfortunately, I don't have any code to share yet, but here's a helpful "how-to" article: http://rcarduino.blogspot.com/2012/04/how-to-read-multiple-rc-channels-draft.html