I'm doing some study on PID AC motor controller. I have a commercial PID motor controller (AC/single phase/220V/50Hz) in hand. It is based on 80535A. I just traced it and drawn the schematic. I noticed an interesting thing that the RPM sensor is not connected to an INT port. It is just connected to a standard IO0 port. Seems RPM signal is converted to analog signal. My question is, how it is then counting RPM?
I wanted to attach the sensor part here. Anybody can explain?
I am very sorry. Numbers are very confused. We looked at a 80535 but it was first a 80517A.
We have lots of source code all in KEIL C. Now we want to adjust the board for our code.
We did consider a analog processor but know that today a digital processor will be faster and we like the 80 processor.
I will post the full details and code on youtube. you can reply there.