#define Button 0
#define LED 2
#define Microphone 15
#define ECHO_PIN 14
#define TRIG_PIN 12

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  delay(1000);
  pinMode(Button, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  pinMode(Microphone, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

int lastState = HIGH;
int lastState2 = LOW;
bool isSpeaking = false;
int iniSample = 2048; //Microphone's flag
int cnt = 0;
void loop() {
  // put your main code here, to run repeatedly:
  button();
  microphone();
  distance();
} 

void button(){
  int value = digitalRead((Button));
  if (lastState != value) {
    lastState = value;
    if (value == HIGH) {
      cnt++;
      Serial.println(" released");
      //Serial.println(cnt%4);
    }
    if (value == LOW) {
      cnt++;
      Serial.println(" pressed");
      //Serial.println(cnt%4);
    }
  }
  led();
}

void microphone(){
  int sample = analogRead(Microphone);
  

  int delta = abs(sample - iniSample);
  //Serial.println(delta);

  if (delta > 50 && isSpeaking == false) {
    cnt++;
    Serial.println(" start speaking");
    isSpeaking = true;
  }
  if (delta < 10 && isSpeaking == true) { //说话结束
    cnt++;
    isSpeaking = false;
    Serial.println( "end speaking");
  }
  led();
  //delay(1000);
}

void led(){
  if (cnt%6 == 1){
    analogWrite(LED, 64);
    //Serial.println("On");
    delay(500);
  }
  if (cnt%6 ==3){
    analogWrite(LED, 1023);
    delay(500);
  }
  if (cnt%6 == 5){
    analogWrite(LED, 0);
    delay(500);
  }
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void distance(){
  float distance = readDistanceCM();
  int State = LOW;
  if (distance < 100){
    State = HIGH;
  }
  if (lastState2 == LOW && State == HIGH){
    cnt++;
    Serial.println(" near");
  }
  if (lastState2 == HIGH && State == LOW){
    cnt++;
    Serial.println(" far");
  }
  lastState2 = State;
  led();
}