/*
23 MC猜数字 - 5 建立函数 - 3
太极创客
www.taichi-maker.com

此程序用于太极创客<<零基础入门学用Arduino教程>>23 MC猜数字 - 5 建立函数 

演示如何建立既有返回值又有参数的用户自定义函数。
2017-04-21
*/

void setup() {
  int pinNumber = 3;
  while(pinNumber <= 9){
    pinMode(pinNumber, OUTPUT);
    pinNumber = pinNumber + 1;
  }
}

// the loop function runs over and over again forever
void loop() {
  int myNumber = getRandomNumber(1, 4); //产生随机1-3数字
  displayNumber(myNumber);				//显示数字
  delay(500);
  displayClear();						//清理显示
  delay(500);  
}
int getRandomNumber(int minNumber, int maxNumber){  //产生随机数字
  int randomNumber;
  randomNumber = random(minNumber, maxNumber);
  
  return randomNumber;
}
void displayNumber(int ledNumber){  //LED数码管显示数字
  switch(ledNumber) { 
    case 1: //显示1
      digitalWrite(4, HIGH);
      digitalWrite(7, HIGH); 
      break;   
    case 2: //显示2
      digitalWrite(3, HIGH);
      digitalWrite(4, HIGH); 
      digitalWrite(5, HIGH); 
      digitalWrite(8, HIGH); 
      digitalWrite(9, HIGH); 
      break;   
    case 3: //显示3
      digitalWrite(3, HIGH);
      digitalWrite(4, HIGH); 
      digitalWrite(5, HIGH); 
      digitalWrite(7, HIGH); 
      digitalWrite(8, HIGH); 
      break;   
    default: //默认显示
        digitalWrite(4, HIGH); 
        digitalWrite(5, HIGH); 
        digitalWrite(7, HIGH); 
        digitalWrite(8, HIGH);  
        digitalWrite(9, HIGH);
  }
}

void displayClear(){  //清理LED数码管显示内容
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW); 
  digitalWrite(6, LOW); 
  digitalWrite(7, LOW); 
  digitalWrite(8, LOW); 
  digitalWrite(9, LOW); 
}