from machine import Pin, ADC
from utime import sleep

# Pin configuration for 7-segment display
seg7a = [Pin(i, Pin.OUT) for i in range(8)]  # abcdefgh
seg7b = [Pin(i, Pin.OUT) for i in range(8, 16)]  # abcdefgh

# Segment patterns for numbers 0-9
pattern = [
    [1, 1, 1, 1, 1, 1, 0, 0],  # 0
    [0, 1, 1, 0, 0, 0, 0, 0],  # 1
    [1, 1, 0, 1, 1, 0, 1, 0],  # 2
    [1, 1, 1, 1, 0, 0, 1, 1],  # 3
    [0, 1, 1, 0, 0, 1, 1, 0],  # 4
    [1, 0, 1, 1, 0, 1, 1, 0],  # 5
    [1, 0, 1, 1, 1, 1, 1, 0],  # 6
    [1, 1, 1, 0, 0, 0, 0, 0],  # 7
    [1, 1, 1, 1, 1, 1, 1, 0],  # 8
    [1, 1, 1, 1, 0, 1, 1, 0]   # 9
]

# Ultrasonic sensor pins (example pins, adjust based on your connections)
TRIGGER_PIN = 21  # Pin for trigger
ECHO_PIN = 20  # Pin for echo

trigger = Pin(TRIGGER_PIN, Pin.OUT)
echo = Pin(ECHO_PIN, Pin.IN)

def read_distance():
    # Send a 10us pulse on the trigger pin
    trigger.value(1)
    sleep(0.00001)
    trigger.value(0)

    # Measure the duration of the pulse on the echo pin
    pulse_duration = 0
    while echo.value() == 0:
        pass
    start_time = utime.ticks_us()

    while echo.value() == 1:
        pass
    end_time = utime.ticks_us()

    # Calculate distance in centimeters
    pulse_duration = end_time - start_time
    distance = (pulse_duration * 0.0343) / 2  # Speed of sound is approximately 343 m/s

    return distance

while True:
    distance = read_distance()
    # Convert distance to a value suitable for display (0-99)
    display_value = int(distance) if distance < 100 else 99
    
    a = display_value % 10
    b = display_value // 10
    
    for i in range(8):
        seg7a[i].value(pattern[a][i])
        seg7b[i].value(pattern[b][i])

    sleep(0.5)  # Adjust the delay as needed