from machine import Pin, ADC, I2C
from time import sleep
from math import log
import ssd1306

beta = 3950
T0 = 25+273.15

sensor = ADC(32)
button = Pin(2, Pin.IN, Pin.PULL_DOWN)
led    = Pin(22, Pin.OUT)

i2c = I2C(0)
display = ssd1306.SSD1306_I2C(128, 64, i2c)

display.fill(0)

display.text('----------------', 0, 0, 1)
display.text('  PUSH TO READ  ', 0, 10, 1)
display.text('----------------', 0, 20, 1)

display.show()

while True:
    
    if button.value() == 1:

        led.value(1)

        digital_value = sensor.read()
        analog_value = digital_value * 3.3/4095
        Tm = (1/(log(1/((4095/digital_value) - 1))*(1/beta) + (1/T0))) - 273.15
        #print("Valore digitale: ", digital_value ,"\tVm: ", analog_value, "V", "\tTm [°C]: ", Tm)

        #sleep(1)
        display.fill(0)

        display.text('----------------', 0, 0, 1)
        display.text('  PUSH TO READ  ', 0, 10, 1)
        display.text('----------------', 0, 20, 1)
        display.text('   T = '+str(round(Tm,2))+' C', 0, 40, 1)
        display.show()
        sleep(1)

    else:
        display.fill(0)
        
        display.text('----------------', 0, 0, 1)
        display.text('  PUSH TO READ  ', 0, 10, 1)
        display.text('----------------', 0, 20, 1)
        
        display.show()
        led.value(0)