#include <VolAnalyzer.h>

#define LED_PIN 13
#define MIC_PIN A0
#define BAUD_SPEED 9600
#define CLAP_LVL 600
#define CLAP_WINDOW_H 500
#define CLAP_NUM 2

VolAnalyzer VA(MIC_PIN);

static bool LED_STATE = 0;
int DELAY = constrain(DELAY, 500, 2500);

void setup() {
  pinMode(MIC_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(BAUD_SPEED);
}

void loop() {  
  if(Serial.available() > 1){
    DELAY = Serial.parseInt();
    DELAY = constrain(DELAY, 500, 2500);
    Serial.println(DELAY);
  }

  static uint32_t timer = millis();
  static uint8_t counter = 0;
  static uint32_t i = 0;

  if(VA.tick()){
    if(VA.pulse() && (VA.getMax() >= CLAP_LVL)){
      Serial.print(i++);
      Serial.println(" Pulse");
      if((millis() - timer) >= DELAY && (millis() - timer) <= CLAP_WINDOW_H + DELAY)
        counter++;
      else counter = 0;
      timer = millis();
    }
  }

  if(counter && (millis() - timer) >= (DELAY + CLAP_WINDOW_H)){
    if(counter + 1 == CLAP_NUM){
      LED_STATE = !LED_STATE;
      digitalWrite(LED_PIN, LED_STATE);
      i = 0;
    }
    counter = 0;
  }
}