Treadmill smart upgrades

We have a fairly old (~10 years) treadmill. But it’s still solid and good (even though my wife reminds me that it is ugly and big). 

For a long time I have thought about adding a optical sensor to the belt to count revolutions of the running belt, and have a second opinion on the speed I’m running at – as I do not believe that the built in speed settings are terribly accurate.

I may still do this – but came across a alternative :

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Hm! It’s still tempting to build my own – but…..

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