from machine import Pin, I2C
import dht
import time

# I2C: SDA GPIO21, SCL GPIO22
i2c = I2C(
    0,
    sda=Pin(21),
    scl=Pin(22),
    freq=100000
)

# DHT22
sensor = dht.DHT22(Pin(15))

# LCD I2C 16x2
from i2c_lcd import I2cLcd
lcd = I2cLcd(i2c, 0x27, 2, 16)

# RTC: DS3231 atau DS1307
RTC_ADDR = 0x68


def bcd_to_int(x):
    return (x >> 4) * 10 + (x & 0x0F)


def read_rtc():
    d = i2c.readfrom_mem(RTC_ADDR, 0, 7)

    sec = bcd_to_int(d[0] & 0x7F)
    minute = bcd_to_int(d[1] & 0x7F)

    # Mode 24 jam
    if d[2] & 0x40:
        raise ValueError("RTC harus mode 24 jam")

    hour = bcd_to_int(d[2] & 0x3F)
    day = bcd_to_int(d[4] & 0x3F)
    month = bcd_to_int(d[5] & 0x1F)
    year = 2000 + bcd_to_int(d[6])

    return day, month, year, hour, minute, sec


lcd.clear()
lcd.putstr("MONITOR SUHU")
lcd.move_to(0, 1)
lcd.putstr("Inisialisasi...")
time.sleep(2)

halaman = 0

while True:
    try:
        sensor.measure()
        suhu = sensor.temperature()
        rh = sensor.humidity()

        hari, bulan, tahun, jam, menit, detik = read_rtc()

        tanggal = "{:02d}/{:02d}/{:04d}".format(
            hari, bulan, tahun
        )
        waktu = "{:02d}:{:02d}:{:02d}".format(
            jam, menit, detik
        )

        lcd.clear()

        if halaman == 0:
            lcd.putstr("T:{:.1f}C H:{:.1f}%".format(
                suhu, rh
            )[:16])
            lcd.move_to(0, 1)
            lcd.putstr("SENSOR AKTIF")
        else:
            lcd.putstr(tanggal[:16])
            lcd.move_to(0, 1)
            lcd.putstr(waktu)

        print("{} {} | Suhu={:.1f} C | RH={:.1f}%".format(
            tanggal, waktu, suhu, rh
        ))

        halaman = 1 - halaman

    except Exception as e:
        print("Error:", e)
        lcd.clear()
        lcd.putstr("Cek sensor/RTC")
        lcd.move_to(0, 1)
        lcd.putstr("Koneksi I2C")

    time.sleep(2)