中断知识

 1 使用一个中断读取编码器的值,
 2 #define PinA 2  //中断0
 3 long count = 0; //计数值
 4 long num = 0;
 5 void setup() 
 6 {
 7 Serial.begin(9600); //窗口初始化
 8 pinMode(PinA,INPUT); //D2脚为输入
 9 pinMode(3,INPUT); //D3脚为输入
10 attachInterrupt(0, blinkA, RISING);  //注册中断0调用函数blinkA
11 }
12 void loop()
13 {
14 while (num != count)
15   {
16     num = count;
17     Serial.println(num);
18   }
19 }
20 void blinkA()
21 {
22   if(digitalRead(3)==1)
23        { count ++;}
24        if(digitalRead(3)==0)
25        {count--;}
26 }