I am building a project where I plan on using:
- 50:1 Micro Metal Gearmotor HPCB 12V with Extended Motor Shaft
- Pololu Wheel 32×7mm Pair - Black
- Magnetic Encoder Pair Kit for Micro Metal Gearmotors, 12 CPR, 2.7-18V (HPCB compatible)
- Pololu Jrk 21v3 USB Motor Controller with Feedback
The wheel will be used to reel a tape measure in and out of it’s housing. The goal is to use the encoder to know how far (within ~1cm) the measuring tape has been reeled out.
As I read about the encoder, it looks like it spins at the RPM of the motor not the output RPM after the gearbox. That leads me to believe this encoder spins at 30k RPM, which seems way too fast to reliably count individual pulses in order to achieve the above goal. Would I be able to measure distance (not just speed) using the setup described?
If not, are there alternative encoders that spin at the lower output frequency? It looks like all Pololu wheel encoders have been discontinued?