Time to put this DIY absolute position encoder to work as a clock

Being able to derive the absolute position of an object is vital in countless applications, primarily for anything that uses a motor. Instructables user holybaf had the idea to build their own rotary encoder, which has 60 degrees of resolution and utilizes a CD to act as a precise clock.

To accomplish this, they first laid down a single circular track featuring patterns of light and dark areas that each correspond to a single value. By reading these areas with a set of six infrared emitters/detectors and comparing their current reading to the previous one, an absolute position can be determined. 

– Werbung –

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