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  1. #1
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    PAIJO SULOYO's Avatar
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    FM radio frequency meter

    hi

    i wanna to measure the frequency from FM radio kit when i playing it, then display it on LCD 16x2.

    someone please teach me how to do it use Microcontroller, i just only know ASM languge


    thanks before

    •   Alt15th June 2012, 05:35

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  2. #2
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    Re: FM radio frequency meter

    Assuming 4 digits readout is sufficient, every tenth of a second...

    You must first scale down the carrier frequency, by using a series of divide-by-10 stages.

    Then run the result to a frequency counter. Then to the LCD. There are all-in-one IC's to make this part easy.

    It's likely you can do all the above with a microcontroller. (I have no experience with them.)

    If it cannot handle 100 MHz waveforms then you'll still need to use one or more separate pre-scalers.



    •   Alt15th June 2012, 19:55

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  3. #3
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    Re: FM radio frequency meter

    frequency counter with PIC microcontroller e.g.

    http://www.qsl.net/dl4yhf/freq_count...q_counter.html



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