38Khz IR carrier - best way to turn it on and off


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    Default 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

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