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Home Raspberry Pi Interfacing LED with Raspberry Pi in GPIO
In this tutorial you will learn how to interface a LED with Raspberry Pi. Just follow the Instructions below. In order to setup VNC and control Raspberry Pi from your PC use this tutorial http://www.learn2crack.com/2013/08/setup-vnc-server-in-raspberry-pi-linux.html and to set up SD card for your Raspberry Pi use this tutorial http://www.learn2crack.com/2013/08/setup-sd-card-for-raspberry-pi.html.

Requirements:

1.Breadboards
2.LEDs
3.Jumper wires

Instructions to Glow LED:

1.Just take a look at the GPIO diagram of Raspberry Pi, which will give you a understanding of GPIO structure.
raspberry pi led gpio
2.Connect GPIO 25 of Raspberry Pi to to the Anode of the LED through connecting jumper wires and Breadboard.
3.Connect Ground of Raspberry Pi to Cathode of the LED through connecting wires and breadboard.
4.Now power up your Raspberry Pi and boot.
5.Open the terminal and enter the commands to glow an LED.
Enter sudo su to drop you into the root terminal
root@raspberrypi:/home/pi# echo 25 > /sys/class/gpio/export
root@raspberrypi:/home/pi# cd /sys/class/gpio/gpio25
root@raspberrypi:/sys/class/gpio/gpio25# echo out > direction
root@raspberrypi:/sys/class/gpio/gpio25# echo 1 > value
6.To turn of an LED enter the command in terminal
root@raspberrypi:/sys/class/gpio/gpio25# echo 0 > value
You can also combine these commands into shell script and execute.

Instructions to Blink LED:

1.Open terminal and type nano blinkled.py
2.It will open the nano editor. Paste the python LED blink code
and save
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(25, GPIO.OUT)

while True:
GPIO.output(25, GPIO.HIGH)
time.sleep(1)
GPIO.output(25, GPIO.LOW)
time.sleep(1)
3. Now run the code python blinkled.py
4.Now LED will be blinking at a interval of 1s. You can also change the interval by modifying time.sleep in the file.
5.Press Ctrl+C to stop LED from blinking.
Enjoy:)
Any questions comment here.
Raj Amal

Raj Amal

Developer at Learn2Crack
Raj Amal is an Android Developer. He Loves to code and explores new technologies. He also authored a book Learning Android Google Maps
Raj Amal
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