slightly OT, need some electronic circuit help
torriem at gmail.com
Mon Oct 8 11:57:07 MDT 2012
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. 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
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.
 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...
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