from machine import Pin
import utime

# Define pin numbers for LED bar
LED_PINS = [10, 11, 12, 13, 14, 15, 16, 17]

# Initialize LED pins
leds = [Pin(pin, Pin.OUT) for pin in LED_PINS]

def hamming_distance(char1, char2):
    char1_ascii = ord(char1)
    char2_ascii = ord(char2)
    
    xor_result = char1_ascii ^ char2_ascii
    
    distance = 0
    while xor_result:
        distance += xor_result & 1
        xor_result >>= 1
    
    return distance

str1 = "hello"
str2 = "world"

max_distance = max(len(str1), len(str2))
for i in range(max_distance):
    if i < len(str1) and i < len(str2):
        distance = hamming_distance(str1[i], str2[i])
        for j, led_pin in enumerate(LED_PINS):
            if j < distance:
                leds[j].on()
            else:
                leds[j].off()
    else:
        for led in leds:
            led.off()
    utime.sleep(1)