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Synopsis

In this tutorial we will learn how to turn ON and turn OFF LED by interfacing with Raspberry Pi. Here we are using Python language for programing LED to turn ON and turn OFF.

Description:

LED:

LED is a semiconductor device having electrodes an Anode and a Cathode that converts electrical energy into light when current passes through it. It is a p-n junction diode that emits light when suitable voltage is applied to the leads. The color of LED depends on the type of semiconducting material used.

Application:

LEDs are used in many applications due to low consumption of power, compact in size, longer lifespan, and low cost.

1.TV backlighting

2.Mobile backlighting

3.LED displays

4.Automotive lighting

5.Traffic lights etc.

Raspberry Pi:

Raspberry Pi is a low cost, small size computer that plugs into a computer monitor, and uses a keyboard and mouse. It is capable device that enables us to explore computing and to learn how to program in languages like scratch and python. It is capable of doing what we expect a computer to do. It has many interfaces like HDMI, multiple USB, Ethernet, onboard Wi-Fi and Bluetooth, GPIOs, USB powered etc. also supports to LINUX, Python to make easy to build applications. Raspberry is available in different versions the latest version of Raspberry Pi is Pi3+ Model and the Updated version is Pi4 model. In Raspberry Pi 3B+ Model this model is having 64-bit quad core (processor) running at 1.4GHz, dual band 2.4GHz, 5GHz wireless LAN, Bluetooth 4.2/BLE, faster Ethernet, and PoE (power on Ethernet) capability with separate PoE HAT. Raspberry Pi3 Mode B+ maintains the same footprint as raspberry Pi2 and Raspberry Pi3 Model B.

Pin configuration:

1. Vin: Two 5v pins and two 3v3 pins used for providing power supply, where processor works on 3.3v.

2. Ground: Having 8 ground Pins which are un-configurable.

3. GPIO: There are 26 input-output pins which will be used as input or output based on programming.

4. PWM: In software PWM are available for all pins but in hardware PWM is available for GPIO12, GPIO13, GPIO18, and GPIO19.

5. 2 SPI bus: These pins are used for SPI communication the pins which are used for SPI is MISO, MOSI, SCLK, CE0, and CE1

6. I2C: These pins are used for I2C communication in which DATA and CLOCK pins are used for sending data to and from the SDA connection, with the speed controlled with SCL pin and ID-SE, ID-SC are reserved for ID EEPROM.

7. TX and RX: This pins are used for UART communication.

Schematic:

Code:

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(8, GPIO.OUT)
while True:
	GPIO.OUTPUT(8, GPIO.HIGH)
	time.sleep(1)
	GPIO.OUTPUT(8, GPIO.LOW)
	time.sleep(1)