Getting Started with LED's

Now since we know how an Arduino works let us have some fun with the board.

For those of you who are new kindly have a look at the link given below.
Let us first design a smart led blinking system which will blink how we want it to, sounds fun right.

So let’s begin
Components Required

  • Resistor                        1No.  330ohms (Standard Red LED and 5V Input)
  • Led                               1No.
  • Arduino UNO              1No.
  • Few Connecting wires
  • Breadboard
Follow the below video for circuit connection reference:

Now since we have made the circuit let us do the coding part

// declare the pin to which LED is connected:
int led = 5; 
//The below is the setup block the part which we want to run only once we declare them in this block
void setup() // initialize the digital pin as an output.
pinMode(led, OUTPUT);
void loop() //The code we write inside void loop runs over and over again in 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

We can introduce delay according to our need Arduino IDE takes values in milliseconds inside the function delay, in the above code 1000 means a delay of 1 sec so if you want to increase or decrease the delay change the values accordingly. You can also use the function delayMicroseconds() if you want to give input in microseconds.
  • Arduino has an inbuilt Led at Pin no.13

The digital pin no. 13 of UNO is actually the 5th pin of port B (Atmega328 IC).

Which we have mapped using the boot-loader firmware.

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