from machine import Pin, I2C
import onewire, ds18x20, time

# ---------------- I2C LCD Setup ----------------
i2c = I2C(1, scl=Pin(3), sda=Pin(2), freq=400000)
LCD_ADDR = 0x27  # common I2C LCD address

def lcd_write_cmd(cmd):
    high = cmd & 0xF0
    low = (cmd << 4) & 0xF0
    for nib in [high, low]:
        i2c.writeto(LCD_ADDR, bytes([nib | 0x04 | 0x08]))
        i2c.writeto(LCD_ADDR, bytes([nib | 0x08]))

def lcd_write_char(ch):
    high = ch & 0xF0
    low = (ch << 4) & 0xF0
    for nib in [high, low]:
        i2c.writeto(LCD_ADDR, bytes([nib | 0x04 | 0x09]))
        i2c.writeto(LCD_ADDR, bytes([nib | 0x09]))

def lcd_init():
    time.sleep_ms(20)
    lcd_write_cmd(0x28)  # 4-bit, 2-line
    lcd_write_cmd(0x0C)  # Display on
    lcd_write_cmd(0x01)  # Clear
    lcd_write_cmd(0x06)  # Entry mode
    lcd_write_cmd(0x80)  # Move cursor to first line

def lcd_print(text):
    for c in text:
        lcd_write_char(ord(c))

# ---------------- DS18B20 Setup ----------------
ds_pin = Pin(14)
ds_sensor = ds18x20.DS18X20(onewire.OneWire(Pin(14)))

time.sleep_ms(500)  # Give sensor time to power up
roms = ds_sensor.scan()
if not roms:
    print("No DS18B20 sensor found!")
    while True:
        pass

# ---------------- Main Loop ----------------
lcd_init()
lcd_write_cmd(0x80)  # Line 1
lcd_print("Hello")   # Display Hello on first line

while True:
    ds_sensor.convert_temp()
    time.sleep_ms(750)  # Wait for conversion
    temp = ds_sensor.read_temp(roms[0])

    lcd_write_cmd(0xC0)  # Line 2
    # Temperature ranges and messages
    if temp < 37.5:
        message = "Low Urgency"
    elif 37.5 <= temp < 39.0:
        message = "Priority"
    else:
        message = "Urgent"

    lcd_write_cmd(0xC0)  # Move cursor to line 2 again
    lcd_print("T:{:.1f}C {}".format(temp, message))
    time.sleep(2)