Arduino 搶答器

本實驗就是將按鍵控制LED的實驗擴展成3 個按鍵對應3 個LED，佔用6 個數位I/O 端口。

int redled=10;     //LED

int yellowled=9;

int greenled=8;

int redpin=7;    //KEY

int yellowpin=6;

int greenpin=5;

int red;

int yellow;

int green;

void setup()

{

pinMode(redled,OUTPUT);      //output

pinMode(yellowled,OUTPUT);

pinMode(greenled,OUTPUT);

pinMode(redpin,INPUT);    //input

pinMode(yellowpin,INPUT);

pinMode(greenpin,INPUT);

}

void loop()

{

red=digitalRead(redpin);

if(red==LOW)

{ digitalWrite(redled,LOW);}

else

{ digitalWrite(redled,HIGH);}

yellow=digitalRead(yellowpin);

if(yellow==LOW)

{ digitalWrite(yellowled,LOW);}

else

{ digitalWrite(yellowled,HIGH);}

green=digitalRead(greenpin);

if(green==LOW)

{ digitalWrite(greenled,LOW);}

else

{ digitalWrite(greenled,HIGH);}

}