The document describes three Python programs for controlling LEDs using a Raspberry Pi: 1) A basic on/off program for a single LED. 2) A continuous blinking program for an LED. 3) A program that uses input from a switch to turn an LED on and off. The programs import GPIO libraries, set the pin modes and numbers, and output high or low voltages to turn the LED on or off, optionally adding delays to create blinking patterns.

5. LED PROGRAMME
import RPi.GPIO as GPIO
pinNum = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(17,GPIO.OUT)
GPIO.output(17,GPIO.HIGH)
GPIO.output(17,GPIO.LOW)

6. LED PROGRAMME(CONTINEOUS)
import RPi.GPIO as GPIO
import time
pinNum = 8
GPIO.setmode(GPIO.BCM)
GPIO.setup(8,GPIO.OUT)
while True:
GPIO.output(8,GPIO.HIGH)
time.sleep(0.5)
GPIO.output(8,GPIO.LOW)
time.sleep(0.5)

7. LED INTERFACING USING ONE
SWITCH

8. import RPi.GPIO as GPIO
import time
pinNum = 8
pinNum = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(8,GPIO.OUT)
GPIO.setup(17,GPIO.IN)
Input=GPIO.input(17)
while True:
if(GPIO.input(17)):
GPIO.output(8,GPIO.HIGH)
time.sleep(0.5)
GPIO.output(8,GPIO.LOW)
time.sleep(0.5)
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