I am using an NPN Sensor mounted near the propeller shaft which will detect a metal edge on the propeller shaft and will give me one pulse per revolution. Can you please rectify my code for measuring RPM.
What happens when you run your existing code with your hardware? Does it produce a RPM reading and how does that reading compare to your actual RPM?
4000 RPM with one pulse per rev = 4000 pulses per minute = 66.67 pulses per second = a period of 15mS. Your bottom loop is running every 50mS. Much too slow. This loop needs to run much faster that the pulses are coming in.
