# 旋轉可變電阻

![](https://1275793585-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2Fcavedu%2F-LwWyONY0SnQRXIxBYtd%2F-LwX0p4g55j1t-Xg2QDK%2F0.png?generation=1576823903241212\&alt=media)

## 專案說明

使用「科易KEYES Arduino UNO R3 開發板」連接「旋轉可變電阻」,讀取旋轉可變電阻數值變化。

此**旋轉可變電阻**包含於**「**[洞洞兩教學材料包 Education Kit 002](https://www.robotkingdom.com.tw/product/rk-education-kit-002/)**」**內。

## KEYES Arduino UNO R3電路圖

* [KEYES Arduino UNO R3](https://www.robotkingdom.com.tw/product/keyes-uno-r3/)
* 通用型彩色Sensor shield v5.0感測器擴充板
* 旋轉可變電阻

**旋轉可變電阻**是**類比訊號輸入**，可以接「A0 \~ A5」的KEYES Arduino UNO R3訊號端上。 本範例連接到「**A0」**

![](https://1275793585-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2Fcavedu%2F-LwWyONY0SnQRXIxBYtd%2F-LwX0p4hy9qCA6LSNRIV%2F1.png?generation=1576823903287485\&alt=media)

## Arduino 程式

每0.5秒鐘會讀取旋轉可變電阻的電位一次， 並顯示在序列埠監控視窗上。

![](https://1275793585-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2Fcavedu%2F-LwWyONY0SnQRXIxBYtd%2F-LwX0p4iREp5ayDGfaQa%2F2.png?generation=1576823903170891\&alt=media)

產生出的 Arduino 程式如下

```c
void setup()
{
 Serial.begin(9600);
}
void loop()
{
 Serial.println(analogRead(A0));
 delay(500);
}
```


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