This example shows the simplest thing you can do with a Raspberry Pi to see physical output
it' one of the classic electronic analogy to "Hello World" is to make an LED blink. Raspberry Pi has many General Purpose Input/Output pins which can be configured as input/output and turned on/off via software.In this Tutorial we will use Raspblocks to generate python code to control the LED, as coding in Raspblocks is very simple and easy yet it's very powerful.
- Raspberry Pi
- 220 Ohm Resistor
Place the LED with a 270 ohm resistor in series with the GND and GPIO pin of Raspberry Pi (use a breadboard for hassle free connection). Always use a resistor with LEDs to limit the current, else you might end up with a burnt LED ;)
Code - Blocks
After running the code, the LED should Blinks If not then check you code and connections and try again.
Code - Python
Create new python file blink.py and enter following code. To run the code, open the terminal and go to directory where you code is located and enter the command " sudo python blink.py " and hit enter.
import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setup(27 GPIO.OUT) while True: GPIO.output(27,True) time.sleep(500) GPIO.output(27,False) time.sleep(500)