from machine import ADC, I2C, Pin, Timer
from pico_i2c_lcd import I2cLcd
from math import log
import utime

sda = Pin(0)
scl = Pin(1)

pin1 = []
pin2 = []
pin3 = []
for i in range(4) :
    pin1.append(Pin(2+i, Pin.OUT))
for i in range(4) :
    pin2.append(Pin(6+i, Pin.OUT))

for i in range(4) :
    pin3.append(Pin(18+i, Pin.OUT))

carry_pin = Pin(17,Pin.OUT)
def conv_bin(num) :
    bin = [0]*4
    if num == 0 : 
        return bin
    i = 0
    while num > 0 :
        bin[i] = (num%2)
        num = num // 2;
        i = i + 1;
    bin.reverse();
    return bin


def on_light(arr,pins):
    for i in range(len(arr)):
        if arr[i] == 1: 
            pins[i].value(1)

def off_light(pins):
    for i in range(4):
            pins[i].value(0)
            
def sumi(first, second):
    retl = [0] * 4 
    carry = 0  
    for i in range(3, -1, -1):  
        sum_bit = first[i] + second[i] + carry
        retl[i] = sum_bit % 2  
        carry = sum_bit // 2 
    return retl,carry

i2c = I2C(0, sda=sda, scl=scl, freq=400000)
device = i2c.scan()
i2caddr = device[0]
lcd = I2cLcd(i2c, i2caddr, 2, 16)

for i in range(16) :
    for j in range(16):
        suml = []
        first = conv_bin(i)
        second = conv_bin(j)
        on_light(first,pin1)
        on_light(second,pin2)
        suml,carry = sumi(first,second)
        on_light(suml,pin3)
        if carry == 1:
            carry_pin.value(1)
        lcd.putstr(f"{i} + {j} = {i + j} ")
        utime.sleep(1)
        off_light(pin1)
        off_light(pin2)
        off_light(pin3)
        carry_pin.value(0)
        lcd.clear()