Read from Photoresistor Module

In this project, we detect the light intensity and display on the I2C LCD1602.

Steps

1. In this project, an I2C LCD1602 is used, so it’s necessary to download the relevant libraries to make it work.

   cd ~/
   wget https://github.com/sunfounder/raphael-kit/blob/master/python/LCD1602.py
   

2. Install smbus2 for I2C.

   sudo pip3 install smbus2
   

3. Save the following code to your Raspberry Pi and give it a name, for example, photoresistor.ty.

   from robot_hat import ADC
   import LCD1602
   import time
   
   # Create an ADC object to read the value from the photoresistor
   a0 = ADC(0)
   
   def setup():
       # Initialize the LCD1602
       LCD1602.init(0x27, 1)
       time.sleep(2)
   
   def destroy():
       # Clear the LCD display
       LCD1602.clear()
   
   def loop():
       while True:
           # Read the value from the photoresistor
           value0 = a0.read()
           # Display the read value on the LCD
           LCD1602.write(0, 0, 'Value: %d  ' % value0)
           # Reduce the refresh rate to update once per second
           time.sleep(0.2)
   
   if __name__ == '__main__':
       setup()
       try:
           loop()
       except KeyboardInterrupt:
           destroy()
       except Exception as e:
           # Clear the LCD and print error message in case of an exception
           destroy()
           print("Error:", e)
   

4. Use the command sudo python3 photoresistor.ty to run this code.