Arduino Interrupt Counter

[wdussault]

I am counting interrupts and no matter what I do it goes 1,2, 10, 210.... I cannot figure out why

Here is the code:

/***********************************************************************************************************************

• Function Name: countPulses

• Description : Increments pulses counter, this is called everytime the pin of the flowmeter goes from LOW to HIGH

• Arguments : none

• Return Value : none
  ***********************************************************************************************************************/
  void countPulses_one() {
  //increment number of pulses by 1, this is us counting number of pulses

  // This gives the time between pulses in milliseconds
  int stop_time = millis();
  float pulse_time = stop_time - start_time;

  Serial.print(String(pulse_time, 3));
  Serial.print(" Pulse Time ");

  pulses_one_sum += pulse_time;
  pulses_one++;
  delay(10);
  Serial.print(String(pulses_one, 3));
  Serial.print(" Pulses ");

  if(pulses_one == 16){
  pulses_one_sum = pulses_one_sum/16;
  float freq = 1000/pulses_one_sum;
  Serial.print(String(freq, 5));
  Serial.println(" ");
  //zero them back out
  pulses_one_sum = 0;
  pulses_one_sum = 0;
  }

  start_time = stop_time;

}

[gilshultz]

Two suggestions, post the Code and a Schematic, not a frizzy thing. With the information you gave us. Currently we are in the same boat, I cannot figure out why either.

[paulpaulson]

Hello,
do you have really delay()s and Serial.println() within in ISR?

[6v6gt]

. . . and you know about defining variables which are set in an ISR and used outside that ISR as volatile ?

[johnwasser]

... and you know about disabling interrupts when you read a multi-byte volatile variable?