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

# 7-segment display layout
#       A
#      ---
#  F |  G  | B
#      ---
#  E |     | C
#      ---
#       D

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))

oldTemperature = 0

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)
]

pins2 = [
    Pin(26, Pin.OUT),  # A
    Pin(22, Pin.OUT),  # B
    Pin(21, Pin.OUT),  # C
    Pin(20, Pin.OUT),  # D
    Pin(19, Pin.OUT),  # E
    Pin(17, Pin.OUT),  # F
    Pin(18, 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
    [0, 0, 0, 1, 0, 0, 0, 1], # a
    [1, 1, 0, 0, 0, 0, 0, 1], # b
    [0, 1, 1, 0, 0, 0, 1, 1], # C
    [1, 0, 0, 0, 0, 1, 0, 1], # d
    [0, 1, 1, 0, 0, 0, 0, 1], # E
    [0, 1, 1, 1, 0, 0, 0, 1], # F
]

def reset():
    """Turns off all segments on the 7-segment display."""
    for pin in pins2:
        pin.value(1)

reset()

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

while True:
    
    temperature = int(read_temperature())
    if temperature < 0:
        temperature = 0
    if oldTemperature != temperature:
        oldTemperature = temperature
        print(temperature)

        i1 = int(temperature / 10)
        i2 = int(str(temperature)[-1])
        for j in range(len(pins2) - 1):
            pins[j].value(digits[i1][j])
            pins2[j].value(digits[i2][j])
    time.sleep(0.1)