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posted on 2013/04/12 07:08:34 AM CEST
the project uses PIC 16F887 and I'm programming using MPLAB IDE low level assembly language. the microcontroller should be able to detect a change in frequency on an external pulse train and count the number of times the train changes frequency in a five minute period. the train has a resonant frequency of about 80kHz which the microcontroller can determine on just after start-up (after a delay of one minute). thereafter the train changes by about plus or minus 5kHz and after every change it returns to its resonant frequency.
