const int btn1Pin = 9;
const int btn2Pin = 8;
bool btn1Val = 0;
bool btn2Val = 0;

const int light1Pin = 13;
const int light2Pin = 12;
const int light3Pin = 11;
const int light4Pin = 10;
bool light1Val = 0;
bool light2Val = 0;
bool light3Val = 0;
bool light4Val = 0;

const int ledPin = 7;

void setup() {
  pinMode(btn1Pin, INPUT_PULLUP);
  pinMode(btn2Pin, INPUT_PULLUP);

  pinMode(light1Pin, INPUT);
  pinMode(light2Pin, INPUT);
  pinMode(light3Pin, INPUT);

  pinMode(ledPin, OUTPUT);

  Serial.begin(9600);
}

void loop() {

  Serial.print("btn1: ");
  Serial.print(digitalRead(btn1Pin));
  Serial.print(" btn2: ");
  Serial.println(digitalRead(btn2Pin));

  Serial.print("light1Pin: ");
  Serial.print(digitalRead(light1Pin));
  Serial.print(", light2Pin: ");
  Serial.print(digitalRead(light2Pin));
  Serial.print(", light3Pin: ");
  Serial.print(digitalRead(light3Pin));
  Serial.print(", light4Pin: ");
  Serial.println(digitalRead(light4Pin));

  btn1Val = digitalRead(btn1Pin);
  btn2Val = digitalRead(btn2Pin);

  light1Val = digitalRead(light1Pin);
  light2Val = digitalRead(light2Pin);
  light3Val = digitalRead(light3Pin);
  light4Val = digitalRead(light4Pin);

  //第一页，只露出btn1，与LED直连
  //四个LDR全部挡住，此时light1Pin为1(黑)
  if(light1Val == 1){
    Serial.println("直连");
    //btn1按下，LED亮，btn1松开，LED灭
    if(btn1Val == 0){
      digitalWrite(ledPin, HIGH);
    }
    else{
      digitalWrite(ledPin, LOW);
    }
  }

  //第二页，只露出btn1，与LED“非”连接
  //露出一个LDR，此时light1Val为0（亮），且light2Val为1（黑）
  else if(light1Val == 0 && light2Val == 1){
    Serial.println("非");
    //btn1没按，LED亮，btn1按下，LED灭
    if(btn1Val == 0){
      digitalWrite(ledPin, LOW);
    }
    else{
      digitalWrite(ledPin, HIGH);
    }
  }

  //第三页，露出btn1和btn2，两个按钮与LED“与”连接
  //露出两个LDR，此时light2Val为0（亮），且light3Val为1（黑）
  else if(light2Val == 0 && light3Val == 1){
    Serial.println("与");
    //btn1，btn2同时按下，LED亮，有一个松开，LED灭
    if(btn1Val == 0 && btn2Val == 0){
      digitalWrite(ledPin, HIGH);
    }
    else{
      digitalWrite(ledPin, LOW);
    }
  }

  //第四页，露出btn1和btn2，两个按钮与LED“或”连接
  //露出三个LDR，此时light3Val为0（亮），light4Val为1（黑）
  else if(light3Val == 0 && light4Val == 1){
    Serial.println("或");
    //btn1，btn2按下任意一个，LED亮，两个一起按也能亮
    if(btn1Val == 0 || btn2Val == 0){
      digitalWrite(ledPin, HIGH);
    }
    else{
      digitalWrite(ledPin, LOW);
    }
  }

  //第五页，露出btn1和btn2，两个按钮与LED“异或”连接
  //异或，露出四个LDR，此时light4Val为0（亮）
  else if(light4Val == 0){
    Serial.println("异或");
    //btn1，btn2按下任意一个，LED亮，两个一起按灭
    if(btn1Val == 0 ^ btn2Val == 0){
      digitalWrite(ledPin, HIGH);
    }
    else{
      digitalWrite(ledPin, LOW);
    }
  }

  delay(100);
}