Raspberry PI LDR example

In this example we connected an LDR to our Raspberry Pi, we will connect the output to a GPIO pin and detect whether its light or dark

Here is a typical module

ldr module

You connect the module to you Raspberry Pi as follows.

Create a file called ldr.py. Enter the following code using your favourite text editor

[codesyntax lang=”python”]

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(4,GPIO.IN)

for i in range(0,5):
    print GPIO.input(4)

[/codesyntax]

Save and run the example by typing the following in at the command line

[codesyntax lang=”bash”]

sudo python ldr.py

[/codesyntax]

No block and unblock the LDR

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