# Project objective: Control the brightness of an LED based on two conditions: light level, motion detected.
# 
# Hardware and connections used:
#   LED to GPIO Pin 15
#   220 ohm resistor for the LED
#   PIR Motion sensor to GPIO Pin 16
#   LDR Sensor to GPIO Pin 28

# modules
from machine import Pin, PWM, ADC    # PWM class is needed to create a PWM object
from time import sleep

# analogue to digital conversion on pin 28 for LDR
LDR = ADC(28)

# creating a PWM object, specifying GPIO Pin 15 as OUT
pwm = PWM(Pin(15))

# creating a PIR object, setting it as IN
pir = Pin(16, Pin.IN)

# setting initial frequency of PWM output at 1000 Hz
pwm.freq(1000)

# continuously read data from the PIR sensor
# print a status whether a motion or detected or not and set LED PWM based on LDR reading
while True:
   if pir.value() == 1:
      print(f"Motion")
      value = LDR.read_u16()
      pwm.duty_u16(value)
  
   else:
      print(f"No motion")
      pwm.duty_u16(0)

    # PIR sensor would check for movement every second
   sleep(1)