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Thanks to everypost. You guys really helped me out. I've just seen all the replies. I will try all of them and write a feedback here. Thanks.

Hi Everyone;

Now i take 64 samples at each time and send them to matlab. I write a delay (delay_ms(2)) in order to obtain a sampling frequency of 500Hz = 1/2ms. (I Know, This calculation is theoric ...

Create a 2ms interrupt. Use that to control the ADC timing. That way you'll not miss any data. The ADC could continue whilst sending data out.

A problem I see with 1000 samples is you're close to r ...

Hi everyone,

Thanks for all the advice. This project is my final project in my engineering faculty so I have to complete this task with USB and use MATLAB for signal processing. I will write a MATL ...

Hi guys,

I know ECG signal magnitude is about milivolts. But i use amplifier, gain controller and DC adder to adjust it between 0-5 V. I have no problem with hardware and i already took samples of ...

Hi everyone,

I'm new here. I made an ADC circuit with 18F2550. I need to take samples from an ECG signal. Maksimum frequency of ECG signal is about 45 Hz. My pic doesn't take sample fastly so i lo ...