LED Interfacing with Arduino

In this blog, we will see how to interface an LED with Arduino.

Hardware Required for interfacing LED with Arduino:

• Arduino (You can use any Arduino board for this project) - 1
• LED - 1 (You can use LED of any color)
• Resistor 330ohm - 1
• Jumper wires - As required
• Breadboard - 1

How to interface LED with an Arduino:

For interfacing an LED with Arduino, we need the above-mentioned components and connections have to be made as per the circuit diagram below.

What is an LED?

LED stands for Light-emitting diode. An LED is a device that produces light whenever current is passed through it.

In this blog, we will blink an LED using Arduino.

Pinout of LED:

Connection of LED with Arduino:

Make the connections as per the circuit diagram shown in the above image. Next, we have to program our Arduino. For programming our Arduino to blink an LED, we need Arduino IDE to be installed on our PC. You can download and install Arduino IDE suitable for your computer OS from arduino.cc

Once, the Arduino IDE is installed on your PC, we have to write a code to blink an LED in the interval of one second. Below is the code for blinking LED using Arduino.

Code:

Explanation:

#define led_pin 3

#define led_pin 3 : First, we have declared a pin name and pin number to which we are going to connect the LED using #define preprocessor constant. We are assigning GPIO 3 pin of Arduino to connect LED and given a name to that pin as “led_pin”.

void setup()

{

 pinMode(led_pin, OUTPUT);

}

void setup() : This function executes only once in our program. In this function, we have called a function called “pinMode(led_pin, OUTPUT);”. The pinMode function is used to tell Arduino, that the connected peripheral is either input or output peripheral. In this function, we are passing the “led_pin” as pin name and “OUTPUT” as type.

void loop()

{

 digitalWrite(led_pin, HIGH);   

 delay(1000);                       

 digitalWrite(led_pin, LOW);   

 delay(1000);                       

}

void loop() : This function executes infinitely in our program. In this function, we have called a function “digitalWrite();” in this function, we pass two arguments. Such as the pin name to which the LED is connected and the state of the pin. “digitalWrite(led_pin, HIGH);” makes the led_pin as HIGH means provides 5V at GPIO pin 3. “digitalWrite(led_pin, LOW);” makes the voltage on the GPIO pin 3 to 0V. In between these two functions, we have used a “delay();” function is used to pause the microcontroller for some period of time during the execution. In this program, we are passing “1000” as an argument to the delay(); function. Which gives a delay of 1000 milliseconds. i.e., 1 second. 

Conclusion:

Interfacing LED with Arduino is a fundamental step towards understanding the basics of hardware programming. By understanding the concepts of LED, its pinout, connection with Arduino, and the code involved, you can create amazing projects that light up your world. With this guide, you can confidently take on the challenge of interfacing LED with Arduino and start experimenting with more complex hardware projects. So grab your Arduino and LED, and let your creativity shine!

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Please do check out other blog posts about Interfacing ACS712 with Arduino , Arduino Interfacing with Ultrasonic Sensor , Interfacing GSM Module with Arduino , Interfacing MAX30100 Pulse Oximeter with Arduino , IR Sensor Interfacing with Arduino , How to connect ZMPT101B to Arduino and  How to use Buzzer with Arduino.

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