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Sharing some project planning phase: A (digital) ELECTRO-MECHANICAL Network

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RJSV:
Coppertone2:
  My recall is that a coil, say wound on thick nail, is fairly weak, in voltage output, especially compared with a piezo sensor. Like, 0. 070 volts vs. 1.8 volts, for loud noises.
But, with added X8 OP amp circuit, (Lm324 has four),
not bad voltage.  Always possible, some foil sheild sometimes grounding that, and wrap around, will help, for hf electrical noise, nearby .

   Of course, for scope trigger, could always trigger on electric dc switched in, for toy motor, then, somewhere, for diagnostics, another toy motor used as generator, creates 'pulse', but that's kind of vague, and besides; single shot stuff on scope won't show well, especially is it changes, each trigger time.

RJSV:
   These 2 diagrams, (enclosed photo), perhaps not related directly, show the kinds of timing, in the milli-Seconds range, generally.
Bottom diagram features a 'SQUARE WAVE' generator, having also those periods of mechanical output 'rest', at standstill while gears still turn (somewhere).

   Upper diagram features the timing (I think...), estimations for the two existing 'OVERFLOW' gear outputs.  The 'L' (left side) gear will turn for a bit, RUN-OUT, until toggle lever TIP gear disengages, approx 90 mSec.
The 'R' (right side) or SET OVERFLOW will run, after TIP gear contact engagement, for as long as input.

RJSV:
I had a really tough time, on this SQUARE WAVE generator. Thinking it would be easy, you have your ON time, plus another timed 'off' time period...at least in ttl electronics...
   This thing does the sequence, for 1 SQ wave cycle, in 'brute force', setting an output and timing that (T1 in diagram). You get the needed positive contact result, at the end of T1, for an assertive response, which is to issue an 'End of T1' signal, signifying the switch had reached end of swing travel.
That starts up action, to soon pull (switch T3), to end the cycle timed by T1, plus the short wind-down T3 represents.
For the (empty action time) of T2, that signifies the off or stationary period, timed and issuing an 'END' pulse, to next section.
  The next section, not shown, is virtually the same, except that it times things for a CCW or counter- clockwise output, in the SQUARE wave.

   Also not shown, is the reset, or 'RECOVERY' mode, where everything (in diagram) needs to be returned to start, for another timed square wave cycle.

RJSV:
   As to any errors, there are plenty...for example, that previous 'SQUARE WAVE' Generator layout showed incomplete waveform diagram, it needed the second 'rest' time, that brings that waveform to 1. 4  seconds, or call it 0. 7  hz.
   Now, innovation for avoiding complete self-destruct, by abrupt direction flips suggests: DON'T DO THAT...
But that doesn't help.
   What can do is:
   Double-up your little system, this is Test Equipment, (potentially), and only making a few...there.
So, one impulse timer/generator runs a pulse output, CW or clockwise, say, once per second.
Now, with attention to phase, exact 180 ° (degrees), another separate little gear layout does the exact same thing, out of phase, and going south (pulse rotates to CCW or counter-clockwise).
Build those two simple sources, and, diagram shows
a simple phase sensitive controller (gear-switch), coordinates start times.
  The two, opposing-coordinated signals mix, logical-or style.

Possibilities include un-conventional timing overlaps, doing unexpected things...

RJSV:
   A brief run through the issues of scale distortion, just common friction being stubborn; I.E. viscous grease + drag...
   Figured, est. that 0 degrees thru 60°, to be way, way slow, at first, at 42 X SLOWER !
Wow, but the stick is static hold, electrons got comfortable stationary, etc etc.
  So, after first 11 degrees or so, figured estimate was:
Go up, decent, and turn curve (see fig.) slope down; Classic 'S' curve, where speed became, essentially without acceleration. Otherwise called peak limited.

   The right side diagram features that same 'S' curve function. Notice, starting the diagram for clockwise, that curve starts with 'jump', to 90 mSec, for only 11 degrees, a bare sixth of total angular travel.
Seems fairly normal. Big dots signify more linear response, travel position, VS. time.

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