初级点灯

int ledPin = 13; // LED connected to digital pin 13
void setup()
{pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{digitalWrite(ledPin, HIGH); // sets the LED ondelay(1000); // waits for a seconddigitalWrite(ledPin, LOW); // sets the LED offdelay(1000); // waits for a second
}

进阶点灯

1>一边点灯，一遍执行其他代码

int ledPin = 13; // LED connected to digital pin 13
int value = LOW; // previous value of the LED
long previousMillis = 0; // will store last time LED was updated上一次激活时间
long interval = 1000; // interval at which to blink (milliseconds)间隔
void setup()
{pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{// here is where you'd put code that needs to be running all the time.// check to see if it's time to blink the LED; that is, is the difference// between the current time and last time we blinked the LED bigger than// the interval at which we want to blink the LED.if (millis() - previousMillis > interval) {previousMillis = millis(); // remember the last time we blinked the LED// if the LED is off turn it on and vice-versa.if (value == LOW)value = HIGH;elsevalue = LOW;digitalWrite(ledPin, value);}
}

2>按钮点灯

int ledPin = 13; // choose the pin for the LED
int inPin = 2; // choose the input pin (for a pushbutton)
int val = 0; // variable for reading the pin status
void setup() {pinMode(ledPin, OUTPUT); // declare LED as outputpinMode(inPin, INPUT); // declare pushbutton as input
}
void loop(){val = digitalRead(inPin); // read input valueif (val == HIGH) { // check if the input is HIGH (button released)digitalWrite(ledPin, LOW); // turn LED OFF} else {digitalWrite(ledPin, HIGH); // turn LED ON}
}