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
Links