# 繼電器
Grove Relay 模組為常開型繼電器，透過它可用低電壓 (3.3V \~ 5V) 進行高電壓的開關控制 (最高電壓支援至交流電 250V 或直流電 30V；最大電流為 5A)。且模組上配有 LED 燈，亮起時表示線路端點為連通狀態。欲取得更多關於此元件的資訊，請參考[官方 WiKi](http://wiki.seeed.cc/Grove-Relay/) 連結。接下來將示範利用繼電器開關 LED 的例子：
### 元件配置
依照下圖連接各元件以進行後續範例：
### 執行程式
1. 在 Arduino IDE 中貼上下列程式碼：
```
int val = 0;
int controlPin = 10;
int buttonPin = 6;
void pin_change(void)
{
val = !val;
}
void setup() {
Serial.begin(9600);
pinMode(controlPin, OUTPUT);
attachInterrupt(buttonPin, pin_change, RISING);
}
void loop() {
if (val)
{
digitalWrite(controlPin, HIGH);
Serial.println("High");
}
else
{
digitalWrite(controlPin, LOW);
Serial.println("Low");
}
delay(500);
}
```
2. 點選工具列上的 **Upload** 按鈕編譯並上傳程式至開發板。
3. 上傳完成後，即可藉由按壓 **USR** 按鈕控制繼電器的開關、進而影響 LED 的開關。
### 實際應用
一般常見的繼電器應用為控制家用電器的開關 (交流電)，線路連接範例如下：
藉由將供電線 (或插座) 中的火線經由繼電器接出，開發者就可透過程式控制的方式操作該電源線的開關。
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