freq counter 0-70hz pic16f877

**Acetronics2** · - 10th January 2006, 12:31

Originally Posted by picpower

i only have to messure I and U and the speed.

it is possible to start timer0 when i receive a high pulse and stop the counter when the next high pulse is coming?

and can the pic do other things when the timer0 counts?

Hi,PicPw

You can use the CCP in capture Mode ...

You could also use Timer 1 as a free running timer and read it periodically ...see Microchip datasheet Timer section for details.

There are many many ways to do it ...

Alain

**Darrenmac** · - 11th January 2006, 08:39

I too would like to get some pointers for a similar project. I want to decode CTCSS tones using a pic. These are pre defined tones lying between 50 and 300Hz. How would I go about having a lookup table of tones and comparing the incomming tone with one in the lookup table? this would have to be done very quickly, 100ms or better

**arniepj** · - 13th January 2006, 01:50

Attached is a program for counting pulses using Tmr1 set in the counter mode and Tmr0 set as an interrupt timer.The interrupt timer counts ticks,after 1 second Tmr1's accumulated count is serial outputed.