InfraRed ramblings

[mark_s]

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

https://dronebotworkshop.com/stepper-motor-hall-effect/

[Demon]

Thanks 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 moving parts,
- impervious to dirt or light seepage,
- can sit directly on the PCB,
- lower cost,
- and waaaay less bulky.


Going to try this hall sensor:
https://www.digikey.ca/en/products/d...ULPGM/12165112

And these magnets:
https://www.digikey.ca/en/products/d...c/8189/5400498

[mark_s]

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 leads (4 phases and a common) so your micro must generate four phases to make it run. It is easier to use a step and direction driver like the one in the hall effect video. I was able to modify the motors to run on a standard driver using this info.

https://forum.arduino.cc/t/howto-mod...-4wire/1132680

[Demon]

Yeah, these are unipolar steppers, not bipolar.

I'm using the ULN2003 as driver that came with them. I'll be switching to a ULN2803 for my use.