... aa=data print "Binary ", GPIO.output(13,False) for bi in range (0,16): bit[bi]=data%2 if bit[bi]: # bit = 1 GPIO.output(7,True) #wiggle clock pin GPIO.output(11,True) GPIO.output(11,False) print "X", else: # bit = 0 GPIO.output(7,False) #wiggle clock pin GPIO.output(11,True) GPIO.output(11,False) ...