from machine import I2C, Pin
from time import sleep
from dht import DHT22

# -------- I2C LCD (PCF8574) DRIVER --------
class I2cLcd:
    def __init__(self, i2c, addr):
        self.i2c = i2c
        self.addr = addr
        self.backlight = 0x08
        self.init_lcd()

    def write(self, data):
        self.i2c.writeto(self.addr, bytes([data | self.backlight]))

    def pulse(self, data):
        self.write(data | 0x04)
        sleep(0.001)
        self.write(data & ~0x04)
        sleep(0.001)

    def send(self, data, mode):
        high = mode | (data & 0xF0)
        low = mode | ((data << 4) & 0xF0)
        self.write(high)
        self.pulse(high)
        self.write(low)
        self.pulse(low)

    def command(self, cmd):
        self.send(cmd, 0)

    def write_char(self, char):
        self.send(char, 0x01)

    def init_lcd(self):
        sleep(0.02)
        self.command(0x33)
        self.command(0x32)
        self.command(0x28)
        self.command(0x0C)
        self.command(0x06)
        self.command(0x01)
        sleep(0.01)

    def clear(self):
        self.command(0x01)
        sleep(0.01)

    def move_to(self, col, row):
        row_offsets = [0x80, 0xC0]
        self.command(row_offsets[row] + col)

    def putstr(self, string):
        for char in string:
            self.write_char(ord(char))

# -------- SENSOR & I2C SETUP --------
dht = DHT22(Pin(15))

i2c = I2C(0, scl=Pin(5), sda=Pin(4), freq=100000)
addr = i2c.scan()[0]
lcd = I2cLcd(i2c, addr)

# -------- MAIN LOOP --------
while True:
    dht.measure()
    temp = dht.temperature()
    hum = dht.humidity()

    print("Temperature: {:.1f} C  Humidity: {:.0f}%".format(temp, hum))

    lcd.clear()
    lcd.putstr("Temp: {:.1f}C".format(temp))
    lcd.move_to(0, 1)
    lcd.putstr("Hum: {:.0f}%".format(hum))

    sleep(2)