On 10/08/2012 11:36 AM, Hugh Clark wrote: > Perhaps I don't fully understand the problem, but couldn't you use an > H-bridge to control the motor (only needing 1 DC power supply) and an ADC > on the Arduino to measure the position? The code in the Arduino would > provide the basic feedback loop allowing you to set rough ADC values from > the pot for your 3 positions.
Of course. I said all that before[1]. Digital circuits are nice, but nothing beats the reliability of a simple analog circuit. I found some good info on op-amps, how they work, unipolar circuits, and exactly what the different resistance values give you. My application is in a very rough environment (dirt, dust, vibration, and extreme temperatures). The simpler the circuit the better. Arduino is way overkill for this application. All in all, this is a case study in why we computer people could probably use a bit of electronics (analog as well as digital) knowledge rather than falling back to code, though that does work very well in many cases. And if I was making a robot I would do it in code, and not use an analog circuit. [1] I've noticed a strong correlation between top-posting and not reading the e-mail one is responding too! You missed the last paragraph of my last e-mail. Posting inline with the quotes helps eliminate this problem. Just saying... /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
