how is the signal frequency (sinus) measured in Atmega8?

[Dana Sorani]

hi
we can measuring sinus signal in atmega8 ?
if Yes Why ?
or No Why ?
Please Explenastion in detail thanks alot

 

[paulfjujo]

hello,

measuring sinus signal ?
amplitude voltage or frequency ?

if Amplitude voltage, you must first scale your peak to peak signal to 5V peak to peak , ( +2,5V maxi -2,5V mini)
and add a DC value of 2,5V to keep in range of ADC input..
then takes ADC measurmement at high speed (mini is Freq of signal * 10 ) to get 10 sample per sinusoide

if frequency
-add and external trigger to transform the sinus in square TTL level
and use Timer counter..