| Electronics > Beginners |
| Measure reversible voltage without PD drop? |
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| 12407622:
Well, that worked out much easier than had been anticipated: https://youtu.be/1_PeoERrCLw 12407622 ;D |
| ledtester:
Can you post a schematic of what you eventually went with? Thanks - and congratulations on getting it working! |
| 12407622:
--- Quote from: ledtester on August 14, 2019, 06:40:50 pm --- Can you post a schematic of what you eventually went with? Thanks - and congratulations on getting it working! --- End quote --- Hi ledtester, Boring old germanium diode bridge wired across the motor terminals, 10K pot from +output of that to gnd, with very tiny greencap (3mm x 8mm x 2mm) and 4V7 clamp zener from wiper output to gnd. The running motor is disabled for 2ms, each 1/12th of a second, after which period the back EMF from 2 successive measurements is averaged. Yet to be properly tuned PID does the rest. A small Kp, much larger Ki, and almost none, but some very small Kd. Sorry, a diagram would be just scribble, as I'm still recovering from an 'accident' with the hard drive I kept all those type of programs on. I hope the description was clear enough for anyone to follow. Thanks very much for your interest, and fabo suggestions, everyone. :) 12407622 |
| 12407622:
Hi, A little larger smoothing capacitor added for better noise immunity, and a stop on collision facility added. https://youtu.be/doWnCFVbF9Y Circuit attached: T. :) |
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