User Desired LED Blinking

STEP 1:

Open LX-Terminal.

Create a file with .py extension

Ex: nano userinput.py

Nano is a type of editor used to write the code in that file named userinput.

Type the following code in that file by insert key or by typing letter I on keyboard.

STEP 2:

Program:

#! /usr/bin/python

Import os

Import time

Import RPi.GPIO as GPIO

GPIO.setmode (GPIO.BCM)

GPIO.setwarnings (False)

GPIO.setup (17, GPIO.OUT)          //configuring 17^th pin as output

GPIO.setup (27, GPIO.OUT)          // configuring 27^th pin as output

#Setup variables for user input

led_choice = 0

count = 0

os.system (‘clear’)

print “which LED would you like to blink”

print “1: Red?”

print “2: Blue?”

led_choice = input (“choose your option: “)               //user choice

if led_choice  == 1:                                                       // select led to blink

os.system (‘clear’)

                    print  “You picked the Red LED”

                    count = input (“How many times would you like it to blink? :  ”)                                                                                                                         //user enter purpose

                    while count > 0 :

                                       GPIO.output (27, GPIO.HIGH)

                                       time.sleep (1)                         //to sleep for one second

                                       GPIO.output (27, GPIO.LOW)

                                      time.sleep (1)                        // to sleep for one second

                                      count = count-1

if led_choice == 2:                                                    // select led to blink

                   os.system (‘clear’)

                   print ”You picked the Blue LED”

                   count = input (“How many times would you like to blink? :  ”) //user enter purpose

                   while count  > 0 :

                                      GPIO.output (17, GPIO.HIGH)

                                      time.sleep (1)                    // to sleep for one second

                                      GPIO.output (17, GPIO.LOW)

                                      Time.sleep (1)                  // to sleep for one second        

                                      count = count-1

Save the file by typing  :wq and then press enter.

To check the output:Type python userinput.py

Output 1:

Output 2:

Output 3:

Output 4:

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Program to blink LED

STEP 1:

Open LXTerminal.

Create a file with .py extension

Ex: nano example.py

Nano is a type of editor used to write the code in that file named example.

Type the following code in that file by insert key or by typing letter I on keyboard.

Program:

#! /usr/bin/python

Import time                                         //importing library called time

Import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

GPIO.setwarnings(False)

GPIO.setup (17, GPIO.OUT)          //configuring 17^th pin as output

GPIO.setup (27, GPIO.OUT)         //configuring 27^th pin as output

                                                           #Turn LED’S ON

GPIO.output (17, GPIO.HIGH)

GPIO.output (27, GPIO.HIGH)

Time.sleep (1)                                   //sleep for one second

                                                          #Turn LED’S OFF

GPIO.output (17, GPIO.LOW)

GPIO.output (27, GPIO.LOW)

Time.sleep (1)

                                                         # Turn LED’S ON

GPIO.output (17, GPIO.HIGH)

GPIO.output (27, GPIO.HIGH)

Time.sleep (1)

                                                       #Turn LED’S OFF

GPIO.output (17, GPIO.LOW)

GPIO.output (27, GPIO.LOW)

GPIO.cleanup

LED Blinking using WHILE Loop:

#! /usr/bin/python

Import time

Import RPi.GPIO as GPIO

GPIO.setmode (GPIO.BCM)

GPIO.setwarnings (False)

GPIO.setup (17, GPIO.OUT)    //configuring 17^th pin as output

GPIO.setup (27, GPIO.OUT)    //configuring 27^th pin as output

                                                     #while basically means loop foreverIt executes the code if some                                                               condition is true.

WHILE 1:                                   //give one tab in the while loop to overcome the indentation error                                                            while compiling

          GPIO.output (17, GPIO.HIGH)

          GPIO.output (27, GPIO.HIGH)

          Time.sleep (1)

          GPIO.output (17, GPIO.LOW)

          GPIO.output (27, GPIO.LOW)

          Time.sleep (1)

To check the output:Type python example.py in lx-terminal.

Output 1:

Output 2:

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