"""
Purpose: read light sensor (analog sensor) input voltage on GP27 (connected to ADC channel 1)
and print the ratio and the voltage value
Modified by: Vivian Phan
Date: 10-29-2025
"""

from picozero import Pot,LED  # Import Pot for analog reading (picozero does not have a ligth sensor class)
from time import sleep

# Create a light sensor object for photoresistor on GPIO 27 using Pot class.
light_sensor = Pot(27)

#Assign LED object to GPIO 15
nightlight_led=LED(15)
#LED will turn on when light level is less than 0.3
darkness_threshhold= 0.3

print("Light sensor reading started...")

while True:
    #read the light level
    light_level=light_sensor.value
    #prints the ratio and the voltage from the analog pin (GP27)
    print(f"Light level Ratio: {light_sensor.value:.2f}, voltage:{light_sensor.voltage:.2f} ")
    
    if light_level < darkness_threshhold:
        # It is dark enough, turn the LED on (like a nightlight)
        nightlight_led.on()
        print("It's dark! LED is ON.")
    else:
        # It is bright enough, turn the LED off
        nightlight_led.off()
        print("It's bright! LED is OFF.")
    sleep(0.5) # pause every half a second