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fully printable optical potentiometer/encoder

by thunderbug, published

fully printable optical potentiometer/encoder by thunderbug Jun 12, 2013

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2700Views 526Downloads Found in Robotics

Summary

Have you ever needed to add a rotational sensor to a robot? They are really expensive and so I tried to make a fully printable optical potentiometer.

Take a look at my Blog to get more informations
http://coolrobotprojects.blogspot.co.at/

The open-Frameworks-Code that generates the Gradient/Encoder-pattern:
https://github.com/thunderbug1/encoder_pattern_generat

The generation of the non radial pattern works but the radial ones don´t.

The thing that´s still missing is a little paper ring with a gradient on it and which is glued to the rotor.

MK1: (First version)

for the photoelectric fork sensor I use this: http://www.pollin.de/shop/downloads/D120592D.PDF

MK2: (Actual early preview)

Sensor: http://www.pollin.de/shop/downloads/D120525D.PDF (Version A)

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No results.

Today I did some tests regarding the printed sensor-wheel and made a blog-post here : http://coolrobotprojects.blogspot.co.at/http://coolrobotprojects.blogs...

as it turns out it will better to simply use printed slots on the wheel and use it as a quadruple sensor.

The actual concept of a printable potentiometer turns out to be not so practical because it would have a precision of +-20 degree.
But I have to add, that I used my crappy HP Officejet 5605z printer to print the test-strips. Maybe someone else with access to a high quality printer is able to get more precision.

mk2 now uses a new sensor, cause the old one didn´t work that well.

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