from machine import Pin, ADC, PWM
import dht
import time


################   Temperature Monitoring Configuration ##############
# Define the GPIO pin where the DHT22 data pin is connected
dht_pin = Pin(4)  # Use GPIO 4 (can be changed to any other GPIO pin)

# Create a DHT22 object
sensor = dht.DHT22(dht_pin)

# User Defined Threshold
user_threshold = 50
################## Alert System Configuration #######################
# Set up potentiometer
potentiometer_pin = 34
# Potentiometer is connected to GPIO 34 (ADC1)
potentiometer = ADC(Pin(potentiometer_pin)) 
potentiometer.width(10)             # Setting ADC Resolution to 10-bits (0-1023)

# Set up buzzer
buzzer_pin = Pin(15)           # Buzzer is connected to GPIO 15
buzzer = PWM(buzzer_pin)

# Set up LED
Led   = Pin(18,Pin.OUT)
Led.value(0)

# Set buzzer PWM frequency and duty cycle
buzzer.freq(1000)  # Initial frequency of 1000 Hz
buzzer.duty(0)     # Start with the buzzer on


while True:
        ################   Temperature Monitoring ##################
       
        # Trigger a measurement
        sensor.measure()

        # Read temperature and humidity
        temperature = sensor.temperature()

        # Print the results
        print('Temperature: {:.1f}°C'.format(temperature))

        #################### Alert System  #######################
        
        # Read potentiometer value (0-1023)
        pot_value = potentiometer.read()
        
        if temperature > user_threshold:
            # Set duty cycle to a moderate value (e.g., 50%)
            buzzer.duty(pot_value)
            # LED turn on
            Led.value(1)
            # Display alert system status
            print("Alert System is On !!")
        else:
            # Set duty cycle to 0 (Turn off buzzer)
            buzzer.duty(0)
            # LED turn off
            Led.value(0)
            # Display alert system status
            print("Alert System is Off !!")

        # Delay for stability
        time.sleep(1)