from machine import Pin,ADC
class Barra16:

    #CONSTRUCTOR
    def __init__(self,s0,s1,s2,s3,out):
        self.__s0=Pin(s0,Pin.OUT)
        self.__s1=Pin(s1,Pin.OUT)
        self.__s2=Pin(s2,Pin.OUT)
        self.__s3=Pin(s3,Pin.OUT)
        self.__out=ADC(Pin(out))

    #METODOS PRIVADOS
    def __read(self,x):
        bits=bin(x)
        bits=bits.split("b")[1]
        for i in range (len(bits),4):
            bits="0"+bits
        self.__s0.value(bits[3]=='1')
        self.__s1.value(bits[2]=='1')
        self.__s2.value(bits[1]=='1')
        self.__s3.value(bits[0]=='1')
        return self.__out.read_u16()
    
    #METODOS PUBLICOS
    def getPos(self):
        pos=0
        sen=0
        for x in range(16):
            v=self.__read(x)
            sen+=1 if v>50000 else 0
            pos+=500*(x+1) if v>50000 else 0
        return -1 if sen==0 else (pos/sen)-4250