Question

You are building a motor controller which attempts to keep a motor turning at 1300 RPM. Your motor uses a code wheel show below. The code wheel has 100 slits that let light through to an optical sensor which converts the light to an electrical signal. What time between pulses should the microcontroller attempt to achieve to maintain 1300 RPM?

Answer 1

we need motor rotating at speed of 1300 revolution per minute.

and code wheel has 100 slits to pass the light upto the sensor so that sensor converts light into electrical signals such tha microcontroller senses that current and rotates the wheel accordingly.

one revolution = 60/1300 seconds =0.0461 seconds

and 100 slits are present in on revolution of wheel.

therefore total time for per slit= 0.0461/100= 0.461 milliseconds.

hence time gap between each slit must be 0.461 milli seconds to achieve 1300 RPM.