from machine import Pin, ADC
import time

# Segment pins (Common Anode: active LOW)
SEGMENTS = {
    'a': Pin(0, Pin.OUT),
    'b': Pin(1, Pin.OUT),
    'c': Pin(2, Pin.OUT),
    'd': Pin(3, Pin.OUT),
    'e': Pin(4, Pin.OUT),
    'f': Pin(5, Pin.OUT),
    'g': Pin(6, Pin.OUT),
    'dp': Pin(7, Pin.OUT)
}

# Digit control pins (right to left)
DIGITS = [
    Pin(11, Pin.OUT),  # Rightmost
    Pin(10, Pin.OUT),
    Pin(9, Pin.OUT),
    Pin(8, Pin.OUT)    # Leftmost
]

# Common anode segment patterns (0=ON, 1=OFF)
NUMBERS = {
    0: {'a':0, 'b':0, 'c':0, 'd':0, 'e':0, 'f':0, 'g':1},
    1: {'a':1, 'b':0, 'c':0, 'd':1, 'e':1, 'f':1, 'g':1},
    2: {'a':0, 'b':0, 'c':1, 'd':0, 'e':0, 'f':1, 'g':0},
    3: {'a':0, 'b':0, 'c':0, 'd':0, 'e':1, 'f':1, 'g':0},
    4: {'a':1, 'b':0, 'c':0, 'd':1, 'e':1, 'f':0, 'g':0},
    5: {'a':0, 'b':1, 'c':0, 'd':0, 'e':1, 'f':0, 'g':0},
    6: {'a':0, 'b':1, 'c':0, 'd':0, 'e':0, 'f':0, 'g':0},
    7: {'a':0, 'b':0, 'c':0, 'd':1, 'e':1, 'f':1, 'g':1},
    8: {'a':0, 'b':0, 'c':0, 'd':0, 'e':0, 'f':0, 'g':0},
    9: {'a':0, 'b':0, 'c':0, 'd':0, 'e':1, 'f':0, 'g':0}
}

# ADC Inputs
adc0 = ADC(26)  # Slide potentiometer
adc1 = ADC(27)  # Photoresistor
adc2 = ADC(28)  # NTC Thermistor

# Globals
current_value = 0  # in millivolts (e.g., 3300 = 3.3V)
last_interrupt_time = 0  # for debouncing

# Display single digit
def display_digit(pos, num, show_dp=False):
    pattern = NUMBERS.get(num, NUMBERS[0])
    for seg, pin in SEGMENTS.items():
        if seg == 'dp':
            pin.value(0 if show_dp else 1)  # Active LOW
        else:
            pin.value(pattern.get(seg, 1))
    for i, d in enumerate(DIGITS):
        d.value(1 if i == pos else 0)

# Display full number with optional decimal
def display_number(value):
    # Format: 3300 → "3300" (3.300V)
    str_val = "{:0>4}".format(value)[-4:]
    digits = [int(c) for c in str_val]
    for i in range(4):
        show_dp = (i == 0)  # show decimal after 1st digit (3.300)
        display_digit(i, digits[i], show_dp)
        time.sleep(0.002)
        DIGITS[i].value(0)

# Detect active input and read voltage in millivolts
def read_active_sensor_mv():
    val0 = adc0.read_u16()
    val1 = adc1.read_u16()
    val2 = adc2.read_u16()
    threshold = 1000

    # Convert raw to millivolts: 3.3V → 3300mV
    def to_mv(raw): return int((raw / 65535) * 3300)

    if val0 > threshold:
        return to_mv(val0)
    elif val1 > threshold:
        return to_mv(val1)
    elif val2 > threshold:
        return to_mv(val2)
    else:
        return 0

# Interrupt handler
def button_handler(pin):
    global current_value, last_interrupt_time
    now = time.ticks_ms()
    if time.ticks_diff(now, last_interrupt_time) > 200:
        last_interrupt_time = now
        current_value = read_active_sensor_mv()
        print("Button pressed! Measured:", current_value, "mV")

# Setup button interrupt
button = Pin(16, Pin.IN, Pin.PULL_UP)
button.irq(trigger=Pin.IRQ_FALLING, handler=button_handler)

# Main loop
while True:
    display_number(current_value)