There are a huge amount of treadmills on the market: https://www.google.ch/search?q=treadmill&lr=&sca_esv=581454130&tbm=isch&sxsrf=AM9HkKn7Y17TmJrTzFfOn-HXLsbHO-ID8w:1699688482683&source=lnms&sa=X&ved=2ahUKEwjcyPSBubuCAxVy3wIHHZ70AjQQ_AUoAnoECAQQBA&biw=1760&bih=850&dpr=1.09 But which one to choose? With a universal Treadmill speed sensor based Raspberry Pi we have a sensor with which we can separate wheat from chaff among the treadmills: From which one can we get data with which we can do something? But this …