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More and more IR PIC ?s

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New Member
I'm sorry to beat this to death but when I get one thing down, it opens more questions.

I have been reading several tutorials on sending pulses out using the 16F628 and I have found a couple of code examples that I like.

One turns on the IR for 9 instructions and then turns off the IR for 15 instructions and then repeats for X amount of times.

The other turns on for 13 then off for 10 and repeats for X amount of times.

What affect does this have on freq? Or other factors? We will be making/programming our own receiver if it makes a difference.

I found some code for a receiver that checks for the pulses and then compares the values. It only checks for how many times it pulsed and not so much on the data. This will work fine for what we want to do.


Well-Known Member
What you do is set the pin your using to oscillate at say 38khz
Then you turn it on 10us and that's a high 1
Then off for 20us that's a low 0
Now the Ir detector is checking for a signal that is riding on a 38khz carrier so to no that it is good data you would send out a start bit like a 1 that is 10us followed by a 40us low then the code you want to send 10us and 20us blocks I just used the time as example
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Well-Known Member
HA HA it was fast 38khz spelled that wrong didn't I oscillate
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* An additional definition is "to bring into focus or tune, to attune".
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