Arduino程式碼如下
int val;
int encoder0PinA = 3;
int encoder0PinB = 4;
int encoder0Pos = 0;
int encoder0PinALast = LOW;
int n = LOW;

void setup() {
pinMode (encoder0PinA,INPUT);
pinMode (encoder0PinB,INPUT);
Serial.begin (9600);
}

void loop() {
n = digitalRead(encoder0PinA);
if ((encoder0PinALast == LOW) && (n == HIGH)) {//上升沿
if (digitalRead(encoder0PinB) == LOW) {
encoder0Pos--;
} else {
encoder0Pos++;
}
Serial.println (encoder0Pos);

}
encoder0PinALast = n;
}

而Unity的程式碼

using UnityEngine;
using System.IO.Ports;

public class Rotary : MonoBehaviour {
SerialPort serialPort = new SerialPort();
// Use this for initialization
void Start () {

    serialPort.PortName = "COM3";
    serialPort.BaudRate = 9600;
    serialPort.Open();
}

}
而Unity執行結果如下

上網爬文了很多人的寫法，可是結果依然存取被拒
有高手可以幫幫忙嗎~~~~謝謝!!!!!