print("Smart Fan System (DHT22 + Servo + OLED)")
print("Date: 13/4/2026")

# import lib
from machine import Pin, SoftI2C, PWM
import dht
import oled_lib
from time import sleep

# pin declaration
dht_pin = Pin(4)
servo = PWM(Pin(13), freq=50)   # 🔥 tukar ke GPIO 13

# OLED I2C
Oled_pin = SoftI2C(scl=Pin(22), sda=Pin(21))

# object declaration
sensor = dht.DHT22(dht_pin)
screen = oled_lib.SSD1306_I2C(128, 64, Oled_pin)

# servo initial position
servo.duty(77)
sleep(1)

# main program
while True:
    try:
        sensor.measure()
        temp = sensor.temperature()

        print("Temperature:", temp, "C")

        # condition control servo
        if temp >= 30:
            servo.duty(128)   # laju
            fan_status = "HIGH SPEED"

        elif 25 <= temp < 30:
            servo.duty(77)    # sederhana
            fan_status = "MEDIUM SPEED"

        else:
            servo.duty(26)    # perlahan
            fan_status = "LOW SPEED"

        # OLED display
        screen.fill(0)
        screen.text("SMART FAN", 10, 0)
        screen.text("Temp: " + str(temp) + "C", 0, 20)
        screen.text(fan_status, 0, 40)
        screen.show()

    except:
        print("Sensor / System Error")

    sleep(2)