from machine import Pin,PWM,ADC
from utime import sleep

LDR = ADC(28)
pwm = PWM(Pin(15))
print("Hello, Pi Pico!")

# The frequency (pwm.freq) tells Raspberry Pi Pico how often to switch 
# the power between on and off for the LED.
pwm.freq(1000)

# For Raspberry Pi Pico in MicroPython, 
# this can range from 0 to 65025. 
# 65025 would be 100% of the time, 
# so the LED would stay bright. 
# A value of around 32512 would indicate that 
# it should be on for half the time.
# Have a play with the pwm.freq() values and the pwm.duty_u16 values, 
# as well as the length of time for the sleep, 
# to get a feel for how you can adjust 
# the brightness and pace of the pulsing LED.

while True:
    value = LDR.read_u16()
    print(value)
    pwm.duty_u16(value)
    if value < 5000:
        print("low")
        sleep(0.001)
    elif value > 5000:
        print("better")
        sleep(0.001)