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Blinking Led Running into Arduino Board


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MUSIC IEEE RMAUCSA   Music: Theme – Axel Foley!  😀

The most popular example or the ABC to learn the Arduino interactive form is the blinking led or toggle bits the output on the digital out of arduino board. The pin number 13 have an implementation of 220 ohm resistor, but it can use other electronics components that comsume the 220 ohm to prepare by connecting a LED, to protect the LED.  On the other hand, we use the 220 ohm resistor if we have to connect to other pin-out.  The example was refer of arduino team developers and just include on his web page.

To build the circuit, attach a 220-ohm resistor to pin 13. Then attach the long leg of an LED (the positive leg, called the anode) to the resistor. Attach the short leg (the negative leg, called the cathode) to ground. Then plug your Arduino board into your computer, start the Arduino program, and enter the code below.

Most Arduino boards already have an LED attached to pin 13 on the board itself. If you run this example with no hardware attached, you should see that LED blink.

 

Schematic

click the image to enlarge

Code

In the program below, the first thing you do is to initialize pin 13 as an output pin with the line

pinMode(13, OUTPUT);

In the main loop, you turn the LED on with the line:

digitalWrite(13, HIGH);

This supplies 5 volts to pin 13. That creates a voltage difference across the pins of the LED, and lights it up. Then you turn it off with the line:

digitalWrite(13, LOW);

That takes pin 13 back to 0 volts, and turns the LED off. In between the on and the off, you want enough time for a person to see the change, so the delay() commands tell the Arduino to do nothing for 1000 milliseconds, or one second. When you use the delay() command, nothing else happens for that amount of time. Once you’ve understood the basic examples, check out the BlinkWithoutDelay example to learn how to create a delay while doing other things.

Once you’ve understood this example, check out the DigitalReadSerial example to learn how read a switch connected to the Arduino.

/*
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
}

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