from machine import Pin, ADC, Timer
import dht
import time
from time import sleep

motion = False

# Pin assignments
pir_pin = Pin(14, Pin.IN)     # PIR sensor connected to GPIO14
led_pin = Pin(2, Pin.OUT)    # LED connected to GPIO27
ldr_pin = ADC(Pin(36))        # LDR connected to GPIO34
buzzer_pin = Pin(4, Pin.OUT) # Buzzer connected to GPIO26
temp_pin = Pin(15)             # DHT sensor connected to GPIO4
relay_pin = Pin(5, Pin.OUT)  # Relay connected to GPIO25

# Setup DHT22 temperature sensor
dht_sensor = dht.DHT22(temp_pin)

# Setup LDR
ldr_pin.atten(ADC.ATTN_11DB)  # Full range: 3.3V

# Thresholds
ldr_threshold = 2000    # Adjust based on LDR readings for sunrise
temp_threshold = 27     # Adjust temperature threshold for turning on the fan/air conditioner

# Function to handle LED based on PIR sensor
def handle_pir(pin):

  global motion
  motion = True
  global interrupt_pin
  interrupt_pin= pin

pir_pin.irq(trigger=Pin.IRQ_RISING, handler=handle_pir)


# Function to handle Buzzer based on LDR sensor
def handle_ldr():

    ldr_value = ldr_pin.read()

    if ldr_value > ldr_threshold:
        buzzer_pin.on()
        time.sleep(0.5)  # Buzzer on for 0.5 seconds
        buzzer_pin.off()  # Turn on buzzer if LDR detects high light intensity (sunrise)
    
    else:
        buzzer_pin.value(0)  # Turn off buzzer


# Function to handle Relay based on Temperature sensor
def handle_temp():
    dht_sensor.measure()
    temp = dht_sensor.temperature()
    if temp > temp_threshold:
        relay_pin.value(1)  # Turn on relay (fan/air conditioner)
    else:
        relay_pin.value(0)  # Turn off relay

# Main loop
while True:
    handle_ldr()
    handle_temp()
    time.sleep(1)  # Delay for debouncing


    if motion :
        print("Movement detect! Interrupt by:",interrupt_pin)
        led_pin.on()
        sleep(20)
        led_pin.off()
        print('Motion stopped!')
        motion =False

    else:
        print("Motion not detected")
        led_pin.off()
        motion = False