程式設計可以改變您的未來(Programming can change your future)。
雲林SONG 全名為雲林軟體工程(SOftware eNGineering)，目標致力於軟體人才的培養並推廣開源軟體落實於資訊教育。程式設計的觀念是軟體產品的基礎，程式碼就像沙子一樣，要紮實，所建立出來的高塔才會穩固。本站也提供資訊教育相關的教學資源。
YunlinSONG stands for Yunlin SOftware eNGineering, offering tutorial for computer programming and promoting open-source software.
Teaching resources in information technology education are provided here.
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本文要使用線上的Arduino模擬環境來示範 LED 閃爍，並說明積木程式產生出來的Arduino C語言之間的對應關係。This tutorial will teach the reader to use Tinkcercad circuits designing a LED blinking project. And illustrate the relationships between the blocks and C code.
材料(Materials)：
Arduino UNO R3 x 1
LED x 1
220 ohm Resistor x 1
Small Breadboard x 1
電路(Circuit)：
LED blinking without breadboard
LED blinking with breadboard
The LED anode is connected to Arduino UNO pin 13. The LED cathode is connected to Arduino UNO ground.
程式碼(The Code)：
上圖左邊是積木程式，右邊是 Arduino C 語言。舉例來說，左邊的 set built-in LED to HIGH 積木所對應的C語言為 digitalWrite(13, HIGH)，wait 1 secs 對應的是 delay(1000)。也就是左邊的四個積木所對應的C語言程式碼是在右邊的 void loop() { .... } 裡。
The left side of the image is blocks and the right side of the image is Arduino C. For example, "set built-in LED to HIGH" is mapped to "digitalWrite(13, HIGH);" in Arduino C. That is, the four blocks on the left side of the image are mapped to the four lines of Arduino C code in the loop() body.
我們可以做底下的實驗(The Experiments)：
1. 不使用電阻，LED燈會怎麼樣？What happens to LED without a resistor?
2. 將LED的正極接到Arduino 的數位腳位 4 (或其他)，此時程式要怎麼修改？Connect LED anode to other Arduino digital pin(except 13). How to modify the code to let LED blinking?
