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

NTC=ADC(Pin(26))
buzzerPin = Pin(33,Pin.OUT)
R=PWM(Pin(21),freq=900,duty=0)
G=PWM(Pin(19),freq=900,duty=0)
B=PWM(Pin(18),freq=900,duty=0)

BETA = 3950
threshold=30

def blink():
    R.duty(1023)
    G.duty(0)
    B.duty(0)
    time.sleep_ms(300)
    R.duty(1023)
    G.duty(1023)
    B.duty(0)

while True:
    
    analogValue = NTC.read()
    celsius = 1 / (log(1 / (4096. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
    sleep(1)     
    if celsius>=30:
        blink()
        buzzer = PWM(buzzerPin ,freq = 262, duty=900)
    else:
        R.duty(0)
        G.duty(0)
        B.duty(0)