This is new/old project - Coil Counter
The idea of Coil Counter is to replace mechanical counting of turns with electronic device which will provide precise implementation of coil. Also I wanted to show that you can make diy, reliable&useful device with minimal costs, this device cost me around 20$. I have to mention that I just made electronic implementation while mechanical isn't finished yet.
How it works?
It works on quite simple way. First when you turn it on, you will see message
Coil Counter then it will switch to menu
Number of turns: now it's your turn to write how many turns you want via 3x4 matrix keyboard. Next, when you finished writing using navigation button
# confirm your data. Next menu will ask you to write speed of motor in a way
PWM: -30%+ , plus and minus are navigation buttons (- ==4, +==6) so with 4,6 buttons you can increase or decrease PWM by 5%. Also when you finished confirm it with
#. The next menu is final it shows you all your written data (Nmbr of turns, PWM) So if you are satisfied confirm it with
# or cancel it with *. It's possible to cancel data at any menu.
Maybe you wonder why PWM is set to 30%?
Well, I came to 30% empirically, testing motor speed at various PWM percentage. In that way 30% seemed just great to be initial value.
Take a look on Schematic.
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| Coil Counter Schematic |
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| Assembly layer |
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| Bottom Layer PCB |
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| 3D |
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| 3D |
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| 3D |
As for sensors I used simple sensor with IR diode and photodiode aka. IR Sensor
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| Burned Speaker coil |
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| New Speaker coil |
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