HW09_01 : Blinking LED

/*

Blink

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

This example code is in the public domain.

*/

void setup() {

// initialize the digital pin as an output.

// Pin 13 has an LED connected on most Arduino boards:

pinMode(1, OUTPUT);

}

void loop() {

digitalWrite(1, HIGH); // set the LED on

delay(500); // wait for a second

digitalWrite(1, LOW); // set the LED off

delay(500); // wait for a second

}

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I knew how to make led turn off and on with Arduino. It show Port1 only is turned on and turned off.