from machine import Pin, PWM, I2C, ADC
import utime
import math
from dht import DHT22
from pico_i2c_lcd import I2cLcd

# Initialize PWM for servo motor
servo_pwm = PWM(Pin(15))
servo_pwm.freq(50)

# Initialize I2C for LCD
i2c = I2C(0, sda=Pin(16), scl=Pin(17), freq=400000)
I2C_ADDR = i2c.scan()[0]
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

# Define keypad and pin configurations
matrix_keys = [['1', '2', '3', 'A'],
               ['4', '5', '6', 'B'],
               ['7', '8', '9', 'C'],
               ['*', '0', '#', 'D']]
keypad_rows = [14, 13, 12, 11]
keypad_columns = [10, 9, 8, 7]

# Initialize row and column pins for keypad
col_pins = [Pin(keypad_columns[x], Pin.IN, Pin.PULL_DOWN) for x in range(4)]
row_pins = [Pin(keypad_rows[x], Pin.OUT) for x in range(4)]
for row_pin in row_pins:
    row_pin.value(1)

# Define secret pin and guess
secret_pin = ['2', '5', '8', '8', '0', '0']
guess = []

# Ultrasonic sensor setup
echo = Pin(4, Pin.IN)
trigger = Pin(5, Pin.OUT)
led = Pin(6, Pin.OUT)

# Define buzzer pin
buzzer = PWM(Pin(2))

# Initialize DHT22 sensor
dht = DHT22(Pin(26))

# NTC temperature sensor setup
BETA = 3950  
R1 = 10000  
V_REF = 3.3  
adc = ADC(Pin(28))

# Define LED pins
red_led = Pin(27, Pin.OUT)
blue_led = Pin(21, Pin.OUT)

def buzzerFunc():
    buzzer.duty_u16(1000)
    utime.sleep(1)
    buzzer.duty_u16(0)

def setup():
    lcd.clear()
    lcd.move_to(0, 0)
    lcd.putstr("Enter Password:")

def scankeys():
    global guess
    for row in range(4):
        row_pins[row].high()
        for col in range(4):
            if col_pins[col].value() == 1:
                key_press = matrix_keys[row][col]
                print("You have pressed:", key_press)
                lcd.move_to(0, 1)
                lcd.putstr("".join(guess) + key_press)
                utime.sleep(0.3)
                guess.append(key_press)
                if len(guess) == 6:
                    checkPin(guess)
                    guess = []
                    lcd.clear()
                    lcd.putstr("Enter Password:")
        row_pins[row].low()

def checkPin(guess):            
    if guess == secret_pin:
        print("You got the secret pin correct")
        lcd.clear()
        lcd.putstr("Door unlock")
        # Turn servo to 180 degrees
        for position in range(4500, 9000, 50):
            servo_pwm.duty_u16(position)
            utime.sleep(0.05)
        utime.sleep(1)
        # Turn servo back to 0 degrees
        for position in range(9000, 4500, -50):
            servo_pwm.duty_u16(position)
            utime.sleep(0.05)
        utime.sleep(1)
    else:
        print("Pin is wrong")
        lcd.clear()
        lcd.putstr("Incorrect pin")
        utime.sleep(2)
        lcd.clear()
        lcd.putstr("Enter Password:")

def measure_distance():
    trigger.value(1)
    utime.sleep_us(10)
    trigger.value(0)
    while echo.value() == 0:
        pulse_start = utime.ticks_us()
    while echo.value() == 1:
        pulse_end = utime.ticks_us()
    pulse_duration = pulse_end - pulse_start
    distance = (pulse_duration * 0.0343) / 2  # Speed of sound is 343 m/s
    return distance

def read_ntc_temperature():
    analog_value = adc.read_u16()
    voltage = (analog_value / 65535) * V_REF
    resistance = R1 / ((V_REF / voltage) - 1)
    kelvin = 1 / (1 / 298.15 + 1 / BETA * math.log(resistance / 10000))
    celsius = kelvin - 273.15
    return celsius

def read_dht_sensor():
    try:
        dht.measure()
        temp = dht.temperature()
        hum = dht.humidity()
        return temp, hum
    except Exception as e:
        print("Error reading DHT sensor:", e)
        return None, None

print("Enter the secret Pin")
setup()

while True:
    scankeys()

    # Read DHT sensor
    temp, hum = read_dht_sensor()
    if temp is not None and hum is not None:
        lcd.clear()
        lcd.putstr(f"T:{temp}C H:{hum}%")
        print(f"Temperature: {temp}°C   Humidity: {hum}% ")
        if temp > 30 or hum > 70:  # Adjust thresholds as needed
            buzzerFunc()
    else:
        print("DHT sensor reading failed.")
        lcd.clear()
        lcd.putstr("DHT read error")
    
    utime.sleep(2)
    lcd.clear()

    # Read NTC temperature
    ntc_temp = read_ntc_temperature()
    if ntc_temp is not None:
        print("NTC Temperature: {:.2f} ℃".format(ntc_temp))
        lcd.putstr(f"NTC Temp:{ntc_temp:.2f}C")
        
        # Control LED based on NTC temperature
        if ntc_temp > 25:
            red_led.on()
            blue_led.off()
        else:
            red_led.off()
            blue_led.on()
    else:
        print("NTC temperature sensor reading failed.")
        lcd.clear()
        lcd.putstr("NTC read error")

    utime.sleep(2)
    lcd.clear()

    # Measure distance
    distance = measure_distance()
    lcd.putstr(f"Distance: {distance:.2f}cm")
    if distance < 10:  # Adjust threshold as needed
        led.on()
    else:
        led.off()

    utime.sleep(2)
    lcd.clear()