print("Lets play with smart fan")
print("Date: 12/4/2026")

#import libraries/modules
import oled_library
from machine import Pin, PWM, I2C
import dht
import time


#Pin Declaration
dht_pin = Pin(15)
servo_pin = Pin(18)
scl_pin = Pin(22)
sda_pin = Pin(21)
oled_pin = I2C(0, scl=scl_pin, sda=sda_pin)
current_angle = 0

#Object Declaration
skrin = oled_library.SSD1306_I2C( width = 128, height = 64, i2c = oled_pin)
dht_sensor = dht.DHT22(dht_pin)
servo = PWM(servo_pin, freq=50)

def set_angle(angle):
    min_duty = 1638   # 0°
    max_duty = 8192   # 180°
    duty = int(min_duty + (angle / 180) * (max_duty - min_duty))
    servo.duty_u16(duty)

def smooth_move(target):
    global current_angle

    step = 2 if target > current_angle else -2

    for angle in range(current_angle, target, step):
        set_angle(angle)
        time.sleep(0.02)

    current_angle = target

#Main Program
while True:
    dht_sensor.measure()
    temp = dht_sensor.temperature()

    if temp < 25:
        angle = 0
        status = "LOW"
    elif temp < 30:
        angle = 90
        status = "MED"
    else:
        angle = 170
        status = "HIGH"
      

    smooth_move(angle)

    # OLED
    skrin.fill(0)
    skrin.text("SMART FAN", 0, 0)
    skrin.text("Temp: {}C".format(temp), 0, 20)
    skrin.text("Fan: {}".format(status), 0, 40)
    skrin.show()

    time.sleep(0.5)