from time import sleep, time
from machine import Pin, ADC, SPI
from math import log

# Uvoz preporucenih biblioteka
from ili934xnew import ILI9341, color565
import tt14
import tt32

BETA = 3950 # Beta vrijednost senzora
R = 10000 # 0tpor senzora pri referentnoj temperaturi
MILIVOLTS = 3300 # Referentni napon u milivoltima

power = Pin(22, Pin.OUT)
power.value(1)

adc = ADC(Pin(28))

spi = SPI(
    0,
    baudrate = 40000000, # 62500000 ?
    miso = Pin(16),
    mosi = Pin(19),
    sck = Pin(18)
)

display = ILI9341(
    spi,
    cs = Pin(17),
    dc = Pin(15),
    rst = Pin(20),
    w = 320,
    h = 240,
    r = 3
)

# Iscrtavanje koordinatnih osa
for i in range(0, 320, 10):
    display.set_pos(i, 230)
    display.print('-')

for i in range(0, 240, 10):
    display.set_pos(0, i)
    display.print('|')

# Prikaz vrijednosti na y-osi
display.set_pos(7, (235 - 40 + (20 - 40) * 7))
display.print('40')

display.set_pos(7, (235 - 30 + (20 - 30) * 7))
display.print('30')

display.set_pos(7, (235 - 20 + (20 - 20) * 7))
display.print('20')

timeStart = time()

while True:
    wastingStart = time()
    
    # Konverzija digitalnog ocitanja ADC-a u stvarni napon
    voltage = round((adc.read_u16() / 65535) * MILIVOLTS)

    # Racunanje otpora senzora na osnovu mjerenog napona
    resistance = R / ((MILIVOLTS / voltage) - 1)

    # Beta aproksimacija Steinhart-Hart jednacine
    kelvin = 1 / (1 / 298.15 + 1 / BETA * log(resistance / 10000))

    # Racunanje temperature u Celzijusima s tacnoscu 0.1 Celzijus
    celsius = round(kelvin - 273.15, 1)

    # Vrijeme proteklo od pocetka izvrsavanja programa u sekundama 
    duration = time() - timeStart

    display.set_pos(220, 0)
    display.set_font(tt14)
    display.print('Napon: ' + str(voltage) + 'mV')
    display.print('Temp: ' + str(celsius) + 'C')
    display.print('Vrijeme: ' + str(duration) + 's')

    display.set_pos(int(duration * 10) + 30, int((235 - celsius + (20 - celsius) * 7)))
    display.set_font(tt32)
    display.print('.')

    wasted = time() - wastingStart
    sleep(1 - wasted)