#define IR_PIN 4
#define PULSE_COUNT 34
#define EDGE_COUNT PULSE_COUNT * 2

int count = 0;
unsigned long edge_times[EDGE_COUNT];
unsigned long now;

void IRAM_ATTR ISR() {
    now = micros();
    edge_times[count++] = now;
}

void printArray(const char *title, unsigned long *arr, int size) {
  Serial.println(title);
  Serial.print("[");
  for (int i=0; i<size - 1; i++) {
    Serial.print(arr[i]);
    Serial.print(",");
  }
  Serial.print(arr[size -1]);
  Serial.println("]");

}

//step 1
void printEdgeTimes() {
    printArray("Edge Times", edge_times, EDGE_COUNT);   
}

//step 2
void printPulseWidths() {
  unsigned long pulse_widths[PULSE_COUNT];
  for (int i=0; i<PULSE_COUNT; i++) {
    pulse_widths[i] = edge_times[2*i+1] - edge_times[2*i];
  }
  printArray("Pulse widths", pulse_widths, PULSE_COUNT);
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");  
  attachInterrupt(IR_PIN, ISR, CHANGE);
}

void loop() {
    if (count == EDGE_COUNT ) {
      detachInterrupt(IR_PIN);
      //printEdgeTimes();
     printPulseWidths();
    count = 0;
    }
    //Serial.println(count);
}