import time,math
from machine import ADC,Pin,SoftI2C
from pico_i2c_lcd import I2cLcd

i2c = SoftI2C(sda=Pin(20),scl=Pin(1),freq=400000) 
lcd_address = i2c.scan()[0] 
print(lcd_address)
lcd = I2cLcd(i2c, lcd_address, 2, 16)
adc= ADC(28)
BETA=3950
red=Pin(27,Pin.OUT)
green=Pin(22,Pin.OUT)
yellow=Pin(26,Pin.OUT)

while True:
    temp=adc.read_u16()
    celsius = 1 / (math.log(1 / (65535. / temp - 1)) / BETA + 1.0 / 298.15) - 273.15;
    print(celsius)
    lcd.clear()
    lcd.putstr(str(celsius)+" *C")
    if(celsius<0):
        yellow.on()
        green.off()
        red.off()
    elif(celsius>23):
        yellow.off()
        green.off()
        red.on()
    else:
        yellow.off()
        green.on()
        red.off()
    time.sleep(5)
    yellow.off()
    green.off()
    red.off()
    lcd.clear()
    time.sleep(1)