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Using back EMF to detect mechanical limits

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Published on Oct 27, 2013

In this video I'm using back EMF to know when the rails reach their mechanical limits.


I took some drawer slides, and used them to create a cursor which can move left/right as well as up/down using 2 DC motors and a chain drive.

First the cursor moves left, then when it cannot go any further, it starts going up. Again when it cannot go any further to moves right, then down, and left again. And so on, indefinitely.

I didn't put any switches or buttons to detect the end of a run, it's all done using back EMF. It detects when the motor stalls essentially, and changes course.

It's all done using an Arduino micro-controller and L298 H-Bridges. Back-EMF circuitry is explained here: https://robidouille.wordpress.com/200...

I'm using my back EMF library to do this:
https://github.com/robidouille/robido...

http://www.robidouille.com
https://www.google.com/+Robidouille

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