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Re: 38Khz IR carrier - best way to turn it on and off - SOLVED
Thanks Everyone!
It worked!
The answer was a pull down resistor. It got rid of that slope. I tried a few, and worked out that 4.7K was the highest value I could use. That gave me a final voltage about 4.2V which should be fine.
Then I had to play with the frequency I specified to get exactly 38 pulses in 1mS. Even though the scope's measurement function still reports it as 38.46KHz - I told you it was a cheap scope!
Here are two images of what I have now.
Thanks again!
Andy
Attachment 8114
"I have noticed that even those who assert that everything is predestined and that
we can change nothing about it still look both ways before they cross the street"
-Stephen Hawking
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Re: 38Khz IR carrier - best way to turn it on and off
the scope is actually correct.- I told you it was a cheap scope!
38.462KHz is as close as you can get to 38KHz hpwm with a 4MHz osc
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Re: 38Khz IR carrier - best way to turn it on and off
I'm using the 8Mhz internal oscillator. I'm curious how you figured that out though, could you educate me?Originally Posted by richard
What if I used a 10 or 16Mhz crystal? I have both on hand.
"I have noticed that even those who assert that everything is predestined and that
we can change nothing about it still look both ways before they cross the street"
-Stephen Hawking
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Re: 38Khz IR carrier - best way to turn it on and off
search the forum for PicMultiCalc by mistere
@8m you can get 37.736 KHz , 38.462 KHz
@16m 38.095 KHz , 38.462 KHz
@10 37.879 KHz , 39.063 KHz
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