树莓派 GPIO高低电平输入

树莓派Pin layout：

import RPi.GPIO as GPIOimport timepinInput= 21 #pin40 - BCM21 according to above tableGPIO.setmode(GPIO.BCM) # set to BCM modeGPIO.setwarnings(False) GPIO.setup(pinInput, GPIO.IN) #set GPIO.IN mode, other can set GPIO.OUT modewhile True:input_value = GPIO.input(pinInput) #Read Data from BCM21 pinprint(str(input_value))time.sleep(1)