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Cheap-O (the sub $2 magnetic endstop)

by hmeyer, published

Cheap-O (the sub $2 magnetic endstop) by hmeyer Jun 3, 2012
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Summary

This is the simplified DIY version of a magnetic endstop. Instead of using a hall effect sensor and some logic, it uses a hall switch. So the board is much simpler.
PLUS - it has a control LED.

Cheap-O in action: http://www.youtube.com/watch?v=smRay_nAUWA

Update: Improved STL for super slim design.

Instructions

Get a TLE4905 (for about 1 EUR), 2 x 4.7 nF caps, a LED, 1.2kOhm and 3.3kOhm resistors and a tiny piece of strip board pcb (I needed 7 strips by 5 holes).
Drill 2 3 mm holes.
Solder according to photos and schematic.
Mount.
Glue a magnet to your axis (I used 3 mm neodym cubes).

enjoy your cheap and accurate endstop.

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Am I reading it wrong, or does your schematic have the resistor values swapped?

I built a couple, with the resistors changed around, and they seem to work so far, except for one thing that I don't understand.

In your video, the LED comes on when the magnet approaches the sensor.

With mine, the LED goes off when the magnet approaches the sensor. Should I care?

strange. Maybe you swapped +5V and GND and also reversed the LED?

Anyway...if you swap +5V and GND now and reverse the LED you should have the desired behaviour.

I have +5 at the side opposite the LED, and Ground at the center, as per the datasheet. However, it appears that the TLE is fine with negative Vs, so swapping things around would also work.

In my final version, I connected the LED resistor to +5 rather than ground, and reversed the LED, which gave it the expected behavior.

Perhaps the magnetic pole affects the switch? ie flip the magnet?

if you flip the magnet it stops working entirely.

corrected

Oh. You are correct. I'll have to correct that.

I love it!

looks like you forgot the capacitors in the instructions 8-) no problem, we can see them in the pics and schematics.

Thank you for sharing this!

Thank you. Just added the caps.

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