# 數位類比轉換器

import RPi.GPIO as IO        # calling for header file which helps us use GPIO’s of PI
import time                          # calling for time to provide delays in program
IO.setwarnings(False)         # do not show any warnings
x=1
b0 =0                                    # integers for storing 8 bits
b1 =0
b2 =0
b3 =0
b4 =0
b5 =0
b6 =0
b7 =0
IO.setmode (IO.BCM)            # programming the GPIO by BCM pin numbers. (like PIN29 as‘GPIO5’)
IO.setup(4,IO.IN)                    # initialize GPIO Pins as input
IO.setup(17,IO.IN)
IO.setup(27,IO.IN)
IO.setup(22,IO.IN)
IO.setup(5,IO.IN)
IO.setup(6,IO.IN)
IO.setup(13,IO.IN)
IO.setup(19,IO.IN)
while 1:                                               # execute loop forever
    if (IO.input(19) == True):
        time.sleep(0.001)
        if (IO.input(19) == True):
            b7=1                                       # if pin19 is high bit7 is true

    if (IO.input(13) == True):
        time.sleep(0.001)
        if (IO.input(13) == True):
            b6=1                                      # if pin13 is high bit6 is true

    if (IO.input(6) == True):
        time.sleep(0.001)
        if (IO.input(6) == True):
            b5=1                                      # if pin6 is high bit5 is true

    if (IO.input(5) == True):
        time.sleep(0.001)
        if (IO.input(5) == True):
            b4=1                                     # if pin5 is high bit4 is true

    if (IO.input(22) == True):
        time.sleep(0.001)
        if (IO.input(22) == True):
            b3=1                                     # if pin22 is high bit3 is true

    if (IO.input(27) == True):
        time.sleep(0.001)
        if (IO.input(27) == True):
            b2=1                                    # if pin27 is high bit2 is true
 
  if (IO.input(17) == True):
        time.sleep(0.001)
        if (IO.input(17) == True):
            b1=1                                    # if pin17 is high bit1 is true

    if (IO.input(4) == True):
        time.sleep(0.001)
        if (IO.input(4) == True):
            b0=1                                    # if pin4 is high bit0 is true
    
    x = (1*b0)+(2*b1)
    x = x+(4*b2)+(8*b3)
    x = x+(16*b4)+(32*b5)
    x = x+(64*b6)+(128*b7)                    # representing the bit values from LSB to MSB
    print ( x)                                              # print the ADC value
    b0=b1=b2=b3=b4=b5=b6=b7=0        # reset values
    time.sleep(0.01)                                   # wait for 10ms