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

adc = ADC(Pin(28))
last_temperature = None
pins1 = [
    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)
]

# Define pins for the second 7-segment display (rightmost digit)
pins2 = [
    Pin(16, Pin.OUT),  # A
    Pin(17, Pin.OUT),  # B
    Pin(18, Pin.OUT),  # C
    Pin(21, Pin.OUT),  # D
    Pin(20, Pin.OUT),  # E
    Pin(22, Pin.OUT),  # F
    Pin(26, Pin.OUT),  # G
    Pin(19, Pin.OUT)   # DP (not connected)
]
digits1 = [1, 1, 1, 1, 1, 1, 0, 1], # -
# Common anode 7-segment display digit patterns for both displays
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 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

def reset():
    """Turns off all segments on both 7-segment displays."""
    for pin1, pin2 in zip(pins1, pins2):
        pin1.value(1)
        pin2.value(1)

reset()


while True:
    temperature = read_temperature()
    if last_temperature is None or abs(temperature - last_temperature) >= 0.1:
        print("Temperature: {:.2f} ℃".format(temperature))
        last_temperature = temperature
        
        
        t1=int(temperature//10)
        t2=int(temperature%10)
        print(t1,t2)

    time.sleep(0.1)

    if temperature <= 0:
        b=abs(temperature)
        t3=int(b%10)
        for j in range(len(pins1)):
            pins1[j].value(digits1[0][j])
        for a in range(len(pins2)):
            pins2[a].value(digits[t3][a])

    else:
        for j in range(len(pins1)):
            pins1[j].value(digits[t1][j])
            pins2[j].value(digits[t2][j])