Arduino学习笔记---Blink

Arduino学习笔记---Blink

Blink 应该是最简单的程序了

来自Arduino官网

/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a second
}

 

主要由两个函数组成：setup() 和 loop()

setup() 只在程序开始时运行一次

loop() 接下来一直运行

几个函数

 

pinMode( pin, INPUT / OUTPUT ) 设置接口的模式

digitalWrite( pin , HIGH / LOW )

在接口写入数字信号：高/低电平

HIGH / LOW 也可以写为 1 / 0

LED_BUILTIN 在这块板上默认是 13 号口

delay (ms) 延时，占用系统资源