# B05. Grove LED 燈條
### 專案說明
使用 **Grove擴充板** 連接 **LED 燈條** ([Grove -](http://wiki.seeed.cc/Grove-Relay/)[ LED Bar](http://wiki.seeed.cc/Grove-LED_Bar/))，控制燈條的亮度刻度從最低到最高，每秒進一格。
{% hint style="info" %}
此**燈條**包含於 [**Grove Starter Kit for LinkIt 7697**](https://www.seeedstudio.com/Grove-Starter-Kit-for-LinkIt-7697-p-2834.html) 內。 使用此範例前請先閱讀 [**Grove 相關基礎知識**](https://docs.labs.mediatek.com/linkit-7697-blocklyduino/b00-grove-12880112.html)， 並依照其內的說明步驟[**安裝 Grove 相關驅動程式**](https://docs.labs.mediatek.com/linkit-7697-blocklyduino/b00-grove-12880112.html#B00.Grove%E7%9B%B8%E9%97%9C%E5%9F%BA%E7%A4%8E%E7%9F%A5%E8%AD%98-grove_driver)
{% endhint %}
### 電路圖
* [LinkIt 7697](https://robotkingdom.com.tw/product/linkit-7697/)
* [Grove breakout for LinkIt 7697](https://robotkingdom.com.tw/product/linkit-7697-2/)
* [Grove - ](https://www.seeedstudio.com/Grove-Ultrasonic-Ranger-p-960.html)[LED Bar v2.0](https://www.seeedstudio.com/Grove-LED-Bar-v2.0-p-2474.html)
{% hint style="info" %}
**LED 燈條**是**數位訊號輸出**， 可以接 **D2/D3/D4/D10/D12** 的 Grove 連接埠。 本範例連接到 **D2**
{% endhint %}
### 積木畫布
產生出的 Arduino 程式如下
```
#include
int i;
Grove_LED_Bar __bar2(3, 2, 0);
void setup()
{
__bar2.begin();
}
void loop()
{
for (i = 0; i <= 10; i++) {
__bar2.setLevel(i);
delay(1000);
}
delay(1000);
}
```
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