NCTU_2014Spring_Embeded System_lab01

//  Lab01
//  LM35 + 4*7 segment Display  
// 七段顯示器 reference: Cooper Maa

// define the LED digit patterns, from 0 - 9
// 1 = LED on, 0 = LED off, in this order:
//                    Arduino pin: 2,3,4,5,6,7,8 (Mapping a,b,c,d,e,f,g of Seven-Segment LED)
byte seven_seg_digits[10][7] = { { 1,1,1,1,1,1,0 },  // = 0
                                 { 0,1,1,0,0,0,0 },  // = 1
                                 { 1,1,0,1,1,0,1 },  // = 2
                                 { 1,1,1,1,0,0,1 },  // = 3
                                 { 0,1,1,0,0,1,1 },  // = 4
                                 { 1,0,1,1,0,1,1 },  // = 5
                                 { 1,0,1,1,1,1,1 },  // = 6
                                 { 1,1,1,0,0,0,0 },  // = 7
                                 { 1,1,1,1,1,1,1 },  // = 8
                                 { 1,1,1,0,0,1,1 }   // = 9
                             };

void setup() {      
  // 7-segment  
  pinMode(2, OUTPUT);  
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  //十位數 ７ 個位數
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  digitalWrite(9, 0);  // 關閉小數點
  Serial.begin(9600); 
}

// 在七段顯示器上顯示指定的一個數字 
void sevenSegWrite(byte digit) {
  byte pin = 2;
  for (byte seg = 0; seg < 7; ++seg) {
    digitalWrite(pin, seven_seg_digits[digit][seg]);
    ++pin;
  }
}

void loop() {
  float reading;
  int temp;
  reading = analogRead(A5);
  temp = (500 * reading) / 1024;
  //十位數輸出
  digitalWrite(10,LOW);
  sevenSegWrite(temp/10);
  delay(5);
  digitalWrite(10,HIGH);
  //個位數輸出
  digitalWrite(11,LOW);
  sevenSegWrite(temp%10);
  delay(5);
  digitalWrite(11,HIGH);
  //電腦顯示debug用
  Serial.println(temp);
}