How To Program Blinking Led With Raspberry Pi Using Python 3

Blinking LED With Raspberry Pi Using Python In this tutorial, we will be creating a simple program to blink LED with Raspberry Pi. We will using the Python programming language to control the LED.

The Raspberry Pi is a credit card-sized computer that is powerful enough to be used for many tasks. It is a low-cost alternative to other more expensive computers and can be used for projects such as a media centre, a web server, or even a desktop PC. In this essay, I will explain how to make a LED blink using Raspberry Pi and Python.

Required Material

Building the Circuit Diagram of LED With Raspberry Pi

Every LED has two sides – one negative and one positive. First, you need to connect the LED to the Raspberry Pi. The positive lead of the LED should be connected to GPIO pin 23. The negative lead of the LED should be connected to a ground pin. Choose the negative one and using the resistor, connect it up to GND.

Setting Up the Raspberry

First, you’ll need to boot up the Raspberry Pi. Then you need to log in and open a terminal window. Now, you need to update the package version of Raspberry Pi using the below command. How to Setup a Raspberry Pi for the First Time | Getting Started with Raspberry Pi

sudo apt-get update

1	sudo apt-get update

sudo apt-get install idle3

1	sudo apt-get install idle3

You have to install the RPi.GPIO package. This package is necessary to access the GPIO pins of Raspberry Pi. You can install this package in raspberry pi 4 using the below command.

sudo apt-get install rpi.gpio

1	sudo apt-get install rpi.gpio

Code – Blinking LED With Raspberry Pi Using Python

Now, you can write Python code for blinking LED in a terminal window.

We will be using GPIO 23 for this tutorial. Once the LED is connected, you will need to open up a Python file. You can do this by opening the IDLE application that comes pre-installed on the Raspberry Pi.

Once IDLE is open, you will need to create a new file by clicking on File > New File. Now that you have a new file open, you will need to type in the following code

Source Code

Save the program named led.py and type “python led.py“ to run the program in a terminal window. Now, you will see that the two LEDs start blinking at one-second intervals. Here, you can see an image of a blinking LED.

#blinking with gpiozero library
from gpiozero import LED
from time import sleep
led = LED(23)
while True:
    led.on()
    print('LED ON')
    sleep(1)
    led.off()
    print('LED OFF')
    sleep(0.5)

#blinking with gpiozero library

from gpiozero import LED

from time import sleep

led = LED(23)

while True:

led.on()

print('LED ON')

sleep(1)

led.off()

print('LED OFF')

sleep(0.5)

Python Programming

Open Terminal
Launch IDLE IDE by typing
After the IDLE launches, open a new window by FILE>OPEN or Ctrl+N
Type the code below in the window
Save the code by FILE>SAVE or Ctrl+S
To run your code RUN>RUN or Ctrl+F5

The following script will turn the LED on for one second, then off for one second:

Blink Code using RPi.GPIO Library

import RPi.GPIO as GPIO
import time

ledPin = 16   #led Pin

def setup():
    GPIO.setmode(GPIO.BOARD)       
    GPIO.setup(ledPin, GPIO.OUT)  
    GPIO.output(ledPin, GPIO.LOW) 
    print ('using pin%d'%ledPin)

def loop():
    while True:
        GPIO.output(ledPin, GPIO.HIGH)  
        print ('LED ON >>>')     # print information on terminal
        time.sleep(1)                   # Wait for 1 second
        GPIO.output(ledPin, GPIO.LOW)   
        print ('LED OFF <<<')
        time.sleep(0.5)                   # Wait for 0.5 second

def destroy():
    GPIO.cleanup()                      # Release all GPIO

if __name__ == '__main__':   
    print ('Program is starting ... \n')
    setup()
    try:
        loop()
    except KeyboardInterrupt:   # Press ctrl-c to end the program.
        destroy()

import RPi.GPIO as GPIO

import time

ledPin = 16 #led Pin

def setup():

GPIO.setmode(GPIO.BOARD)

GPIO.setup(ledPin, GPIO.OUT)

GPIO.output(ledPin, GPIO.LOW)

print ('using pin%d'%ledPin)

def loop():

while True:

GPIO.output(ledPin, GPIO.HIGH)

print ('LED ON >>>') # print information on terminal

time.sleep(1) # Wait for 1 second

GPIO.output(ledPin, GPIO.LOW)

print ('LED OFF <<<')

time.sleep(0.5) # Wait for 0.5 second

def destroy():

GPIO.cleanup() # Release all GPIO

if __name__ == '__main__':

print ('Program is starting ... \n')

setup()

try:

loop()

except KeyboardInterrupt: # Press ctrl-c to end the program.

destroy()

Source Code For Breathing LED With Raspberry Pi

import RPi.GPIO as GPIO
import time

LedPin = 16     #  LED Pin

def setup():
    global p
    GPIO.setmode(GPIO.BOARD)      
    GPIO.setup(LedPin, GPIO.OUT)  
    GPIO.output(LedPin, GPIO.LOW)  

    p = GPIO.PWM(LedPin, 500)      #  PWM Frequence to 500Hz
    p.start(0)                     #  initial Duty Cycle to 0

def loop():
    while True:
        for dc in range(0, 101, 1):  
            p.ChangeDutyCycle(dc)    
            time.sleep(0.01)
        time.sleep(1)
        for dc in range(100, -1, -1):
            p.ChangeDutyCycle(dc)    
            time.sleep(0.01)
        time.sleep(1)

def destroy():
    p.stop() 
    GPIO.cleanup() 

if __name__ == '__main__':     
    print ('Program is starting ... ')
    setup()
    try:
        loop()
    except KeyboardInterrupt:  # Press ctrl-c to exit the program.
        destroy()

import RPi.GPIO as GPIO

import time

LedPin = 16 # LED Pin

def setup():

global p

GPIO.setmode(GPIO.BOARD)

GPIO.setup(LedPin, GPIO.OUT)

GPIO.output(LedPin, GPIO.LOW)

p = GPIO.PWM(LedPin, 500) # PWM Frequence to 500Hz

p.start(0) # initial Duty Cycle to 0

def loop():

while True:

for dc in range(0, 101, 1):

p.ChangeDutyCycle(dc)

time.sleep(0.01)

time.sleep(1)

for dc in range(100, -1, -1):

p.ChangeDutyCycle(dc)

time.sleep(0.01)

time.sleep(1)

def destroy():

p.stop()

GPIO.cleanup()

if __name__ == '__main__':

print ('Program is starting ... ')

setup()

try:

loop()

except KeyboardInterrupt: # Press ctrl-c to exit the program.

destroy()

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Blinking LED With Raspberry Pi Using Python

Required Material

Building the Circuit Diagram of LED With Raspberry Pi

Setting Up the Raspberry

Code – Blinking LED With Raspberry Pi Using Python

Source Code

Python Programming

Blink Code using RPi.GPIO Library

Source Code For Breathing LED With Raspberry Pi

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