Hi my name is GerryK - Introduce Yourself

RE: Hi my name is GerryK

Will — Mon, 08 Nov 2021 18:23:37 +0000

@gpdkeogh

I would just rotate the BYJ stepper (fairly slowly) until the Hall sensor goes HIGH and then set your location to zero.

I don't know your layout so I can't comment on how to position the sensor. I presume that your stepper shaft drives a magnet through some kind of path and that, on startup, you need the position to be set to a known location. If you position the magnet at a point where it just triggers the sensor when it's properly situated, then you're finished.

Using a toggle switch will be frustrating and inaccurate.

So, if your Hall sensor is on pin hallPin ...

while (!digitalRead(hallPin)) {

... // advance one or more steps depending on the accuracy required

}

position = 0; // At starting location

This will rotate the shaft until the Hall sensor goes high which is, I think, what you wanted.

Note that this can also be used at any time during operation if you need to reset the device.

hope this helps.

RE: Hi my name is GerryK

gpdkeogh — Mon, 08 Nov 2021 17:38:23 +0000

question: Yes I am using the ULN2003 driver chip with the Arduino Uno R3 board. I am trying to find a way to use magnetic hall effect switch to zero the position on start-up of the stepper motor. Once find zero immediately stop. A toggle switch moves the stepper forward 1/4 motor revolution (2048 steps / 4). What is the best software approach to use? While loop??

RE: Hi my name is GerryK

Will — Mon, 08 Nov 2021 16:40:26 +0000

@gpdkeogh

Welcome to the forum.

I've used BYJ motors with the basic ULN drivers, but never had need to home them.

What questions do you have ?

RE: Hi my name is GerryK

YurkshireLad — Mon, 08 Nov 2021 16:02:37 +0000

Welcome Gerry! I claim to be a developer by day, and there are also numerous people here who can also help you out with your code.

Hi my name is GerryK

gpdkeogh — Mon, 08 Nov 2021 15:37:23 +0000

Hi my name is Gerry and I am have an electronics hardware background mostly in power electronics and and now working on an interesting new project but am new to software development. I have some basic understanding of computer programming that is very dated so need to get myself up to speed. I am joining the Forum to share my project and get ideas on code for same.

I would like to hear from those who have experience using 28BYJ-48 stepper motor control and "homing" on power up using a Hall Effect device and external digital input to turn the motor certain number of steps.

So far I have the motor turning and changing directions using a Hall effect.

Thanks for any feedback.

Gerry