I bought some of those stepper motors you linked above. Really cheap, small with a gearbox, but be aware they are wired so you cannot use them with a standard stepper driver module. These have five...
mark_s - 16th July 2025, 16:38Thanks Mark!
I was considering laying a limit switch flat along the outer edge of the disk, and use a notch to catch the limit switch roller. But I'm liking the hall sensor even more:
- no...
You can also use a hall effect IC and a small magnet. The hall effect ic's come in a 3 pin TO-92 package and are easy to interface to your micro.
For example
...
ARGH! That's what they're called. :D I knew these existed, I just didn't know their names.
Demon - 15th July 2025, 22:53Search optical interrupter. These are used often for homing.
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There will be minimal light leakage. These will be on either side of a disk, as close as I can get them.
I plan on putting black heatshrink over the LEDs as close as I can to the rotating disk.
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if there is any ambient light leakage a ir sensor like SEN-19018 would be better than a photo diode, with the bonus of making
led modulation unnecessary too.
if the distance between led and...
Using this 940nm LED set on Amazon: https://www.amazon.ca/dp/B01HGIQ8NG
Can I have the transmitter LED on without any pulsing? (resistor values are temporary, did not do any calculations yet)
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Re: InfraRed ramblings
Yeah, these are unipolar steppers, not bipolar.
Demon - 16th July 2025, 23:27I'm using the ULN2003 as driver that came with them. I'll be switching to a ULN2803 for my use.