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Frequency Analyzer using Microcontroller

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satria02

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I have microcontroller AVR ATmega32, Direct Digital Synthesizer (DDS AD9951), mixer SA612A, Low Pass Filter Max 297, and ADC ADCS7476....

Do you have some idea to read the frequency signal by using that IC device?

thanks alot

Satria
 

mehtadhaval

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If the freq. range to be measured is in the lower range (~1 MHz) , you can do one thing : make a schmitt trigger and give the inpput signal to the schmitt trigger. Also, set the o/p of schmitt trigger on TTL level. And apply this o/p to any pin of the Micro-controller. On the micro-controller, you can run a code that counts the no. of HIGHs and LOWs in predetermined time window (say 100ms or 500 ms or 1 S). This way you can count the frequency of the signal.
 

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