/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
*/
// the setup function runs once when you press reset or power the board
void setup() { // initialize digital pin 13 as an output.
pinMode(2, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(2, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(2, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
代码说明
pinMode(2,OUTPUT) – 在使用Arduino的引脚之前,你需要告诉Arduino Uno R3它是INPUT还是OUTPUT。我们使用一个内置的“函数”pinMode()来做到这一点。