Raspberry pie tap switch button to use

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2、 Use raspberry pie to design a simple key control LED Light on system . Read the external digital signal through the raspberry pie controller , Use three buttons to control three colors LED The lamp , When a key is pressed, the corresponding LED The light will light up , After the key is released, the corresponding LED The light goes out . Press one of the three keys , You can see the corresponding one LED The light will light up ; When pressing two buttons at the same time , Two corresponding LED The light will come on ; When you press three keys at the same time, there are three LED The lights are on at the same time . Complete the hardware connection circuit design of the control system , Draw the system hardware principle block diagram and program flow chart , Programming , The system has passed the joint commissioning and has been summarized and analyzed .

1. import RPi.GPIO
   import time
   yellow=0
   red=5
   green=6
   button1=13
   button2=19
   button3=26
   RPi.GPIO.setmode(RPi.GPIO.BCM)
   RPi.GPIO.setup(red,RPi.GPIO.OUT)
   RPi.GPIO.setup(green,RPi.GPIO.OUT)
   RPi.GPIO.setup(yellow,RPi.GPIO.OUT)
   RPi.GPIO.setup(button1, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
   RPi.GPIO.setup(button2, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
   RPi.GPIO.setup(button3, RPi.GPIO.IN, pull_up_down=RPi.GPIO.PUD_UP)
   try:
       RPi.GPIO.output(red,1)
       RPi.GPIO.output(green,1)
       RPi.GPIO.output(yellow,1)
      
       while True:
               time.sleep(0.06)
               if RPi.GPIO.input(button1) == 0:
                   RPi.GPIO.output(red,1)
               else:
                   RPi.GPIO.output(red,0)
   
               if RPi.GPIO.input(button2) == 0:
                   RPi.GPIO.output(green,1)
               else:
                    RPi.GPIO.output(green,0)
   
               if RPi.GPIO.input(button3) == 0:
                    RPi.GPIO.output(yellow, 1)
               else:
                     RPi.GPIO.output(yellow, 0)
   
   
   
   except KeyboardInterrupt:
       pass