#include <stdint.h>

#define MIC_PIN A2
#define BUZZER_PIN 6
#define LED_PIN A0

//The minimum amount of clap loudness to be registered as a clap
const uint16_t CLAP_LOUDNESS_THRESHOLD = 400;

//The maximum loudness between the two claps
const uint16_t SILENT_LOUDNESS_THRESHOLD = 200;

//The amount of time from the detection of the first clap until testing if there is silence
const uint16_t PAUSE_TIME = 250;

volatile uint16_t mic_value;
unsigned long second_clap_timer;

bool leds_are_on = false;


void setup() {
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
  // put your setup code here, to run once:
  pinMode(MIC_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:


  //Take in mic reading for the first clap
  uint16_t mic_value = analogRead(MIC_PIN);
  //Check if it is greater than the threadhold
  if ( mic_value > CLAP_LOUDNESS_THRESHOLD ) {
    Serial.println("First clap detected!");
    delay(PAUSE_TIME); //Wait PAUSE_TIME
    //Read in a new mic value for the silence between the claps
    mic_value = analogRead(mic_value);
    Serial.println(mic_value);
    //If the value is under the threshold, then it is silent
    if ( mic_value < SILENT_LOUDNESS_THRESHOLD ) {
      Serial.println("Silence detected!");
      //wait a bit of time beforce looking for the second clap
      //delay(PAUSE_TIME);
      second_clap_timer = millis();
      while(((millis() - second_clap_timer) < 2000)){
        mic_value = analogRead(MIC_PIN);
        if(mic_value > CLAP_LOUDNESS_THRESHOLD){
          Serial.println("Second clap detected!");
          tone(BUZZER_PIN, 3038, 200);
          if( leds_are_on == false ){
            activate_light();
          }
          else{
            deactivate_light();
          }
          delay(1000);
          break;
        }
      }
      
    }
  }

  delay(1);
}

void activate_light() {
  digitalWrite(LED_PIN, HIGH);
  leds_are_on = true;
}

void deactivate_light() {
  digitalWrite(LED_PIN, LOW);
  leds_are_on = false;
  return;
}