Which Pic Should I choose?

[cGr]

Hi..I am new in this site..There are very useful informations..Thanks..
I need a pic model that I want to get 2 sine signal and compare them about their phase difference?And I want to use the pic to generate 40 kHZ frequency..Do you have any idea about this?
Thanks for your help..

 

[Nigel Goodwin]

Generating 40KHz is trivial, check my IR tutorial - as for comparing sinewaves, square them first, and compare the squarewaves.

Presumably you're looking at ultrasonic sensors of some kind?.

 

[cGr]

Thanks..Yes,I will use ultrasonic sensors with my pic..And ı want to compare two signal in my pic..One ADC and 2 analog input is enough for this process?

 

[Nigel Goodwin]

I don't see where you need analogue inputs at all? - like I said, convert the inputs to squarewaves and compare those. However, I'm a little confused about the two waveforms to compare anyway - why two?.

 

[theo92]

40KHz frequency can be very easily generated by a NE555 timer IC in astable mode....I used it in my school projects

 

[cGr]

I should learn that how much is the phase shifting between these two signal with using pic?

 

[philba]

What Nigel is saying is that you don't need analog to determine phase relationship of 2 sine waves. Think about it - how could you represent the phase relationship digitally.