Stumbled onto this project, thought some might be interested... Schematic, source and hex compiled for ATmega8 @ 8Mhz
http://davidegironi.blogspot.gr/2014/05/a-pickup-winding-machine-built-on.html#.U5PhwXJdXK1
https://www.youtube.com/watch?v=gNgywx7ITok
One wonders why do a complicated uP design when a very simple glue logic design will do the job. If it was completely automagic (as in set it up & walk away), then I could see the value. All that said, I suppose it would be a lot less wiring than a few counters & 7-segment displays - but (I expect) a LOT more effort in code - especially in a high-level language like C*. There was a time, not all that long ago, when a nice veeder-root mechanical counter would have been cheaper still :)
david (transformer/coil winder from WAY back!)
*I designed, built and coded a coin rejector programmer for electronic coin mechs using an 8031 and 2x16 row display (in 8051 assembly) about 20 years ago.
Looks like an analog output to control the speed, the DC motor has it's own PWM controller?
If you are going to take the leap to a micro-controller, I would think it would be easier to get a stepper motor from an old printer, and use a few digital outs, with transistors to step up the currents/voltages, and run the stepper motor directly...
Then a simple counter accumulates your # turns (scaled for steps/revolution).
Using an analog output requires a properly scaled integration function over time to accumulate the # turns, especially when using a ramp up function.
The alternative is a handlheld drill, and LCD counter, a magnet, and a reed switch.....the last three can be had from China these days for about $12....
Instead of an actual counter, you can use the *cheapest* calculator. (Does not work on better calcs.)
Wire your switch across the "=" key.
Press "1" then "+".
Turn. Each pulse does a "+1" and the count goes up.
Quote from: PRR on June 08, 2014, 11:11:24 PM
Instead of an actual counter, you can use the *cheapest* calculator. (Does not work on better calcs.)
Wire your switch across the "=" key.
Press "1" then "+".
Turn. Each pulse does a "+1" and the count goes up.
I saw a YouTube video where a guy used a calculator and a sewing machine to wind pups. He wired a momentary on the sewing machine to a calculator. Then used the machines footpedal to control the speed.
That's the way I would wind a pup. Seems like a simple effective way to do it.