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

BETA = 3950  # Beta coefficient of the thermistor
R0 = 10000   # Resistance of thermistor at 25 degrees Celsius
T0 = 298.15  # Reference temperature (Kelvin) for Beta calculation
old_temperature = 0.0

adc = ADC(Pin(28))

pins = [
    Pin(2, Pin.OUT),  # A
    Pin(3, Pin.OUT),  # B
    Pin(4, Pin.OUT),  # C
    Pin(5, Pin.OUT),  # D
    Pin(6, Pin.OUT),  # E
    Pin(8, Pin.OUT),  # F
    Pin(7, Pin.OUT),  # G
    Pin(0, Pin.OUT)   # DP (not connected)
]

pins_2 = [
    Pin(18, Pin.OUT),  # A
    Pin(19, Pin.OUT),  # B
    Pin(20, Pin.OUT),  # C
    Pin(21, Pin.OUT),  # D
    Pin(22, Pin.OUT),  # E
    Pin(27, Pin.OUT),  # F
    Pin(26, Pin.OUT),  # G
    Pin(0, Pin.OUT)   # DP (not connected)
]

# Common anode 7-segment display digit patterns
digits = [
    [0, 0, 0, 0, 0, 0, 1, 1], # 0
    [1, 0, 0, 1, 1, 1, 1, 1], # 1
    [0, 0, 1, 0, 0, 1, 0, 1], # 2 
    [0, 0, 0, 0, 1, 1, 0, 1], # 3
    [1, 0, 0, 1, 1, 0, 0, 1], # 4
    [0, 1, 0, 0, 1, 0, 0, 1], # 5
    [0, 1, 0, 0, 0, 0, 0, 1], # 6
    [0, 0, 0, 1, 1, 1, 1, 1], # 7
    [0, 0, 0, 0, 0, 0, 0, 1], # 8
    [0, 0, 0, 1, 1, 0, 0, 1], # 9
]

def reset():
    """Turns off all segments on the 7-segment display."""
    for pin in pins:
        pin.value(1)
    for pin in pins_2:
        pin.value(1)

def read_temperature():
    analogValue = adc.read_u16()  
    if analogValue == 0:  # Avoid division by zero
        analogValue = 1
    resistance = (65535 / analogValue) - 1
    resistance = R0 / resistance
    temperature = 1 / (log(resistance / R0) / BETA + 1.0 / T0) - 273.15
    return temperature

reset()

switch = Pin(13, Pin.IN)

if __name__ == "__main__":
     while True:
        temperature = read_temperature()
        if temperature < 0:
            temperature = 0

        tens = int(temperature) // 10
        units = int(temperature) % 10

        if temperature != old_temperature:
            print("Temperature: {:.2f} ℃".format(temperature))
            
            # Display tens digit
            for i in range(len(pins)):
                pins[i].value(digits[tens][i])
            
            # Display units digit
            for i in range(len(pins_2)):
                pins_2[i].value(digits[units][i])
            
            old_temperature = temperature

        time.sleep(0.01)