1void setup() {
 2  // put your setup code here, to run once:
 3    // 这里的代码在开始的时候运行一次
 4    code doing something;  // 每一行代码用分号结尾 
 5
 6}
 7
 8void loop() {
 9  // put your main code here, to run repeatedly:
10    // 这里的代码会循环重复运行
11
12}

 1/*
 2  Blink
 3
 4  Turns an LED on for one second, then off for one second, repeatedly.
 5  打开LED一秒钟，然后关闭一秒钟，重复。
 6  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
 7  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
 8  the correct LED pin independent of which board is used.
 9  If you want to know what pin the on-board LED is connected to on your Arduino
10  model, check the Technical Specs of your board at:
11  大多数arduino都有一个可以控制的板载LED。
12  在UNO， MEGA和ZERO上，它连接到数字引脚13，在MKR1000引脚6上。
13  领导_BUILTIN设置为正确的LED引脚，与使用哪个板无关。
14  如果您想知道板上LED连接到Arduino模型上的引脚，请查看板的技术规格：
15  https://www.arduino.cc/en/Main/Products
16
17  modified 8 May 2014
18  by Scott Fitzgerald
19  modified 2 Sep 2016
20  by Arturo Guadalupi
21  modified 8 Sep 2016
22  by Colby Newman
23
24  This example code is in the public domain.
25
26  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
27*/
28
29// the setup function runs once when you press reset or power the board
30// 按复位键或单板上电时，设置功能运行一次
31void setup() {
32  // initialize digital pin LED_BUILTIN as an output.
33  // 初始化数字引脚LED_BUILTIN作为输出。
34  pinMode(LED_BUILTIN, OUTPUT);
35}
36
37// the loop function runs over and over again forever
38// 循环函数会一直运行下去
39void loop() {
40  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level) 打开LED （HIGH是电压等级）
41  delay(1000);                      // wait for a second 等一秒  一秒是一千毫秒
42  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW 通过使电压低来关闭LED
43  delay(1000);                      // wait for a second
44}

 1int delaytime = 3000;
 2void setup() {
 3  // initialize digital pin LED_BUILTIN as an output.
 4  // 初始化数字引脚LED_BUILTIN作为输出。
 5  pinMode(LED_BUILTIN, OUTPUT);
 6}
 7
 8// the loop function runs over and over again forever
 9// 循环函数会一直运行下去
10void loop() {
11  delaytime = delaytime +1000 // 随着循环递加
12  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level) 打开LED （HIGH是电压等级）
13  delay(3000);                      // wait for 3 second 等一秒  一秒是一千毫秒
14  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW 通过使电压低来关闭LED
15  delay(delaytime);                      // wait for delaytime second
16}

 1int delaytime = 100;
 2int LED_pin = 13; 
 3// On the UNO, MEGA and ZERO it is attached to digital pin 13
 4// 连接到数字引脚13
 5void setup() {
 6  // initialize digital pin LED_BUILTIN as an output.
 7  // 初始化数字引脚LED_BUILTIN作为输出。
 8  pinMode(LED_pin, OUTPUT);
 9}
10
11// the loop function runs over and over again forever
12// 循环函数会一直运行下去
13void loop() {// 随着循环递加
14  digitalWrite(LED_pin, 5);  // turn the LED on (HIGH is the voltage level) 打开LED （HIGH是电压等级）
15  delay(delaytime);                      // wait for 3 second 等一秒  一秒是一千毫秒
16  digitalWrite(LED_pin, 0);   // turn the LED off by making the voltage LOW 通过使电压低来关闭LED
17  delay(delaytime);                      // wait for delaytime second
18}