Raspberry Pi GPIO user manual (LED, Button Control Sample)

As Raspberry Pi developing for IOT today we will go to learn about GPIO of KIT BOARD.
Firstly look on the GPIO structure.

To control GPIO we have 2 method (Python)

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM) or GPIO.setmode(GPIO.BOARD)

So what is difference between GPIO.BCM and GPIO.BOARD 

GPIO.BCM --> Follow the Board Com pin

GPIO.BOARD --> Follow the IO Header assembly in Raspberry Pi KIT

Let start to wiring Led into Raspberry KIT as bellow

When we use LED we need get a Resistor series connect   to prevent over load for LED.

R = (U_Input – U_Led)/I_Led = (3,3V – 2V)/0.005 = 260ohm 

U_Input: GPIO Voltage Output

ULed and I Led always around 1.2V ~ 3V & 5mA

#Programe Code:

import RPi.GPIO as GPIO
from time import sleep
 
GPIO.setmode(GPIO.BOARD)
GPIO.setup(29, GPIO.OUT)
GPIO.setup(35, GPIO.IN, pull_up_down=GPIO.PUD_UP)
try: 
while True:
    if GPIO.input(35) == False:
        GPIO.output(29, 1)
        sleep(0.3)

finally:

    GPIO.cleanup()  # clean up all port