Main_algorithm_Sampling_board.cpp

// C++ code
//

int amp = 0;
void setup()
{
  Serial.begin(9600);
  // TIMER 1 for interrupt frequency 20 Hz:
  cli(); // stop interrupts
  TCCR1A = 0; // set entire TCCR1A register to 0
  TCCR1B = 0; // same for TCCR1B
  TCNT1  = 0; // initialize counter value to 0
  // set compare match register for 20 Hz increments
  OCR1A = 12499; // = 16000000 / (64 * 20) - 1 (must be <65536)
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS12, CS11 and CS10 bits for 64 prescaler
  TCCR1B |= (0 << CS12) | (1 << CS11) | (1 << CS10);
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
  sei(); // allow interrupts
}

void loop()
{
 
}

ISR(TIMER1_COMPA_vect){
   //interrupt commands for TIMER 1 here
  amp = analogRead(A0);
  amp /= 4;
  Serial.print(amp);
  Serial.print(',');
}