"""
Temperature and Humidity Monitor using Raspberry Pi Pico
Hardware: DHT22 Sensor + 16x2 I2C LCD Display
Platform: Wokwi Simulator
Author: MakeMindz
"""

from machine import Pin, I2C
from time import sleep
import dht
from lcd_api import LcdApi
from pico_i2c_lcd import I2cLcd

# LCD Configuration
I2C_ADDR = 0x27      # I2C address of LCD (default for most I2C LCDs)
I2C_NUM_ROWS = 2     # Number of rows on LCD
I2C_NUM_COLS = 16    # Number of columns on LCD

# Pin Configuration
DHT_PIN = 15         # DHT22 sensor data pin (GPIO 15)
I2C_SDA_PIN = 0      # I2C SDA pin (GPIO 0)
I2C_SCL_PIN = 1      # I2C SCL pin (GPIO 1)

# Initialize I2C for LCD
i2c = I2C(0, sda=Pin(I2C_SDA_PIN), scl=Pin(I2C_SCL_PIN), freq=400000)
lcd = I2cLcd(i2c, I2C_ADDR, I2C_NUM_ROWS, I2C_NUM_COLS)

# Initialize DHT22 sensor
sensor = dht.DHT22(Pin(DHT_PIN))

# Startup message
lcd.clear()
lcd.putstr("MakeMindz")
lcd.move_to(0, 1)
lcd.putstr("Temp & Humidity")
sleep(2)

print("Temperature and Humidity Monitor Started!")
print("=" * 40)

def celsius_to_fahrenheit(celsius):
    """Convert Celsius to Fahrenheit"""
    return (celsius * 9/5) + 32

def read_sensor():
    """Read temperature and humidity from DHT22 sensor"""
    try:
        sensor.measure()
        temp_c = sensor.temperature()
        humidity = sensor.humidity()
        return temp_c, humidity
    except OSError as e:
        print(f"Failed to read sensor: {e}")
        return None, None

def display_readings(temp_c, humidity):
    """Display temperature and humidity on LCD"""
    if temp_c is not None and humidity is not None:
        # Convert to Fahrenheit
        temp_f = celsius_to_fahrenheit(temp_c)
        
        # Clear LCD
        lcd.clear()
        
        # Line 1: Temperature
        lcd.putstr(f"Temp:{temp_c:.1f}C")
        lcd.move_to(0, 1)
        
        # Line 2: Humidity
        lcd.putstr(f"Humid:{humidity:.1f}%")
        
        # Print to console
        print(f"Temperature: {temp_c:.1f}°C ({temp_f:.1f}°F)")
        print(f"Humidity: {humidity:.1f}%")
        print("-" * 40)
    else:
        # Display error message
        lcd.clear()
        lcd.putstr("Sensor Error!")
        lcd.move_to(0, 1)
        lcd.putstr("Check Wiring")
        print("Error: Could not read sensor data")

# Main loop
while True:
    try:
        # Read sensor data
        temperature, humidity = read_sensor()
        
        # Display on LCD and console
        display_readings(temperature, humidity)
        
        # Wait 2 seconds before next reading
        sleep(2)
        
    except KeyboardInterrupt:
        print("\nProgram stopped by user")
        lcd.clear()
        lcd.putstr("Program Stopped")
        break
    except Exception as e:
        print(f"Error in main loop: {e}")
        lcd.clear()
        lcd.putstr("System Error!")
        sleep(2)