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

ADC_temp = ADC(Pin(2)) # pin 2 will be used to monitor temperature
ADC_light = ADC(Pin(15)) # pin 15 will be used to monitor light level

lcd1_address = 0x27
lcd2_address = 0x26

i2c = SoftI2C(scl = Pin(22), sda = Pin(23), freq = 400000)

lcd1 = I2cLcd(i2c, lcd1_address, 2, 16)  # the display has 2 rows and 16 columns
lcd2 = I2cLcd(i2c, lcd2_address, 2, 16)  # the display has 2 rows and 16 columns


beta = 3950 # beta coefficient of the thermistor being used
kelvin = 273.15 # value of temperature in Kelvin at zero Celsius

GAMMA = 0.7;
RL10 = 50;

while True:
    temp_value = ADC_temp.read()
    lcd2.move_to(0,0)

    temperature_in_celsius = 1 / (log(1 / (4096 / temp_value - 1))/beta + 1.0 / 298.15) - kelvin
    temperature_in_celsius=round(temperature_in_celsius,1)

    lcd2.putstr('Temp is: ') # print to LCD display
    lcd2.putstr(str(temperature_in_celsius)) # print to LCD display
    lcd2.putstr('   ') # print to LCD display
    sleep(.2)

    light_value = ADC_light.read()
    print(light_value)
    # Convert the analog value into lux value:
    voltage = light_value / 4095 * 5
  
    resistance = 2000 * voltage / (1 - voltage / 5);
    lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA))
    lux=round(lux,1)

    lcd1.move_to(0,0)
    lcd1.putstr(str(lux)) # print to LCD display
    lcd1.putstr(' Lux      ') # print to LCD display