Raspberry PI - Reading and Writing to GPIO Pins

Next step is to combine the GPIO Input and Output in to one program.

With the power to the rPI off, I used another jumper to tie header pin 18 to the input of a high impedance logic probe.

Then I powered up, logged in and nano's up the following program "switch_led.py"

#!/usr/bin/python
#
import time
import RPi.GPIO as GPIO
#
# to use Raspberry Pi board pin numbers
GPIO.setmode(GPIO.BOARD)
#
GPIO.setup(18, GPIO.OUT)
GPIO.setup(11, GPIO.IN)
#
count = 1
while (count < 100):
        input_value = GPIO.input(11)
        GPIO.output(18, input_value)
        print input_value
print ("End")

Then I ran it with

     $ sudo python switch_led.py

Now when the switch is turned on  and off, the led goes on and off. 

Congratulations, you now have a $35 programmable light switch. But once you can get digital data in and out of a program , the sky is the limit!



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