from machine import Pin, SoftI2C, ADC
from math import log
from i2c_lcd import I2cLcd 

ADC_temp = ADC(Pin(2)) # pin 2 will be used to monitor temperature

lcd1_address = 0x27

i2c = SoftI2C(scl = Pin(22), sda = Pin(23), freq = 400000) # set up I2C bus

lcd1 = I2cLcd(i2c, lcd1_address, 2, 16)  # the display has 2 rows and 16 columns


def get_temperature():
    beta = 3950 # beta coefficient of the thermistor being used
    kelvin = 273.15 # value of temperature in Kelvin at zero Celsius

    temp_value = ADC_temp.read()
    # Convert the analog value into temperature
    temperature_in_celsius = 1 / (log(1 / (4096 / temp_value - 1))/beta + 1.0 / 298.15) - kelvin
    temperature_in_celsius=round(temperature_in_celsius,1)
    return temperature_in_celsius



while True:
    
    lcd1.move_to(0,0)
    temp_reading  = get_temperature()
    lcd1.putstr('Temp is: ') # print to first LCD display
    lcd1.putstr(str(temp_reading)) 
    lcd1.putstr('   ')