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IR based home automation HOW TO COUNT THE PULSE CODE MODULATION OUTPUT

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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pdi33

Sat Jul 12 2008, 11:52AM

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well, if there are two timer/counters in the PIC,i think u may need both of them, one in the counter mode to count the pulses and one in the timer mode (internal clock) to measure the time. just start the timer and counter simultaneously and read the counter value when the internal timer reaches a fixed pre determined value.

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electronicfreak

sashijoseph

Sun Jul 13 2008, 12:01AM

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Guys,I think the OP wants to decode the RC5 codes rather than count pulses.

Calling electronicfreak....... do you want to decode the RC5 pulses in order to determine which key was pressed or do you want to count the number of pulses received?

Let there be music........

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electronicfreak

pdi33

Sun Jul 13 2008, 12:02AM

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right arun , i got it now.
actually , i was thinking on the lines that the pulses are continuous, but the IR sensor would give a burst of pulses which can happen randomly in real time so yes, u need the interrupt to sense when that occurs, right?

good thinking .

* inspired to develop,developing to inspire *

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electronicfreak

electronicfreak

Sun Jul 13 2008, 09:44PM

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sashijoseph wrote ...

i want to determine which key was pressed .. which ever the way ,its counting pulses of the burst or the other

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Ajay

Mon Jul 14 2008, 08:05AM

Rickey's World Admin

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Electronicfreak, he is not angry on anyone

Please take it lightly..

anyway.. there are number of ways you can decode the IR signal. as i told you my asm code do the same. you can take it as a reference.

I have considered the fixed timing of IR signal which is known as per RC5 protocol. other way is you calculate the timing on runtime by using timer controlled by interrupt.

If you do the timer way, your program will become clock frequency independent. So you can use either way you want.

You can download the code from download section and test it and analyze it carefully.

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