import time
from machine import Pin, ADC, I2C, SoftI2C,
from pico_i2c_lcd import I2cLcd
import math

i2c = SoftI2C(sda=Pin(20),scl=Pin(19),freq=400000)
led = Pin(5, Pin.OUT)
lcd_addr = i2c.scan()[0]

lcd = I2cLcd(i2c,lcd_addr, 2, 16)
lcd.clear()
lcd.move_to(5,1)

beta = 3950
GAMMA = 0.7;
RL10 = 50;

adc = ADC(28)
pht = ADC(27)
while True:

    led.off()
    lcd.clear()
    lcd.move_to(0,1)
    photo = pht.read_u16()
    tmp = adc.read_u16()
    voltage = photo / 65536 * 5;
    resistance = 2000 * voltage / (1 - voltage / 5);
    lux = pow(RL10 * 1000 * pow(10, GAMMA) / resistance, (1 / GAMMA));
    lux = round(lux,1)
    celsius = 1 / (math.log(1 / (65536 / tmp - 1)) / beta + 1.0 / 298.15) - 273.15
    celsius = round(celsius,2)
    if celsius > 40:
        led.on()
    lcd.putstr(" {0}C  {1}Lux".format(celsius,lux))
    time.sleep(1)