今天拿到一块Arduino UNO R3板，迫不及待就开始试用了。相比Raspberry Pi是一个全能的电脑，Arduino则是个硬件开源的单片机，因为开源，资料和配件网上就很很多了，也就容易让初学者上手了。
Arduino特点:
- 开源，硬件标准化，配套传感器等模块很多；
- 结构简单
- 实时系统，稳定，启动只要0.5秒
Arduino IDE
上电测试
用USB线接在电脑USB口，然后在GND和PIN 13上插一个二极管，注意二极管正极插在PIN 13上, 如下图：
(注：还应该串联一个300欧姆的限流电阻才保险！)
上传代码
在Arduino IDE编辑好下面的代码，然后点Upload后就会运行了，会看到LED一闪一闪。
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
*/
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}