Measuring speed directly from hall sensor.

[8o887]

As far as I can tell, it should be easy to measure the angular velocity of the motor by triggering interrupts on an Arduino directly from one of the Hall sensor leads to the controller. I'm wondering why this is not one of the standard ways of doing it (or if it actually is)?

 

[E-HP]

As far as I can tell, it should be easy to measure the angular velocity of the motor by triggering interrupts on an Arduino directly from one of the Hall sensor leads to the controller. I'm wondering why this is not one of the standard ways of doing it (or if it actually is)?

The Cycle Analyst does that through it CA connector to the controller. For controllers without a CA plug, you tap into the hall sensor wires when making a custom plug:

http://www.ebikeschool.com/add-cycle-analyst-connector-controller/

 

[8o887]

Thanks very much for the quick reply! I was planning to tap into the motor connector. Do you happen to know if there are voltage spikes above 5V on those lines when the motor is running, or are they already filtered by an upstream capacitor somewhere?