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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
You connect the module to you Raspberry Pi as follows.
Pi GPIO header | Pin Number | LDR module |
---|---|---|
3v3 | 1 | Vcc |
GND | 6 | GND |
GPIO 4 | 9 | SIG |
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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