Hall Effect Senor

I am planning on making my own hall effect sensor with a A3144 sensor, but I am a bit confused on the wiring. Can you just wire it directly? A lot of other designs seem to have resistor and capacitors, and I dont know what their purpose is.

Not advisable to wire directly. Hall effect sensors usually give analog output, proportional to distance of magnetic field.

All the solutions I have seen have an adjusting knob, that means you can set a point where the output is triggered to give a definite digital response to the endstop input on your controller.

If you wire direct, you will have to set up manually, and that is a recompilation job every time you want to adjust! Lots more work.

It's worth paying the few pounds extra for a board with an adjustable threshold. Saves a lot of messing about.

The A3144 is a digital output Hall sensor, so you can wire it directly to an endstop connector. It needs 5V power. You should connect a 100nF capacitor between the Supply and Ground pins, close to the sensor. The output will go low when a magnet is near, so if you are using it as an endstop, this is the opposite of a normally-closed switch.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

OK. But if the "near" factor isn't the right distance, you will have issues adjusting the distance. That is my concern - what do you do, use a bigger magnet if too close? Or a smaller magnet if it is too distant? Regular units you can adjust very easily. I really do not know how you would go about that with a digital sensor - how else do you adjust the trigger threshold if you wire it directly?

Edited 1 time(s). Last edit at 01/28/2017 03:56PM by DragonFire.