RPM math

A project log for Adding BLE to a "dumb" treadmill

I have a Gold Gym 410 which is perfect for my purposes. But I always had an itch about tapping into speed and inclination data.

Enzo LombardiEnzo Lombardi 08/05/2022 at 18:020 Comments

Quick math to determine the RPM range.

The pulley driving the belt has a diameter of 44mm.

That puts the number of RPMs at 10mph to a bit shy of 2000.
Which means that four digits are enough to accomodate the RPMs at unit precision.

2000 RPMs is also 33.3 RPSs. Which gives a period of 30 milliseconds at maximum speed.