from machine import Pin, SoftI2C
from ssd1306 import SSD1306_I2C
from machine import Pin,Timer,ADC,PWM
from math import log
import time
from time import sleep

NTC=ADC(Pin(27))
I2C = SoftI2C(scl=Pin(12),sda=Pin(14))
BETA = 3950
led=Pin(17,Pin.OUT)
buzzerPin = Pin(16,Pin.OUT)

def ntc(NTC):
    analogValue = NTC.read()
    celsius = 1 / (log(1 / (4096. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15
    return celsius

while True:
    celsius=ntc(NTC)
    oled = SSD1306_I2C(128, 64, I2C, addr=0x3c)
    if celsius>40:
        text=str(round(celsius,1))
        oled.text(text,50,28)
        oled.show()
        time.sleep_ms(800)
        buzzer = PWM(buzzerPin ,freq = 100, duty=900)
        led.value(1)
    elif celsius<=40:
        led(0)
        buzzer = PWM(buzzerPin ,freq = 100, duty=0)
        text=str(round(celsius,1))
        oled.text(text,50,28)
        oled.show()
        time.sleep_ms(800)