Question

Code the following example and screenshot the text output.

import RPi GPIO as GPIO #sets up library to access the GPIO pins import time #imports the time library GPIO.setmode (GPIO.BCM) #sets the GPIO pins mapping to match the Broadcom mapping buttonPin = 12 #the line below sets up buttonPin as INPUT and uses the internal #pull up resistor to avoid shorting out the pin GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) while Truel: inputState = GPIO.input(buttonPin) if inputState == False: print("Button pressed!!") time. sleep(.2)

After you have the test code working, modify it so that it has the following features: ○ The ‘while’ loop is inside a try/except error check. This allows a <CTRL>C to break out of the loop ○ Keep track of the number of button presses with an accumulator variable ○ After the loop is ended with an exception, create an attractive output which tells the user that the program has ended as well as the number of times the button was pressed ○ Also, include the GPIO.cleanup() code to nicely disconnect from the GPIO ● Run the code and take a screenshot after you have broken out of the loop ● Here’s an example output:

this is python programming.

Answer 1

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)

count = 0
buttonPin = 12

GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
try:
while True:
   inputState = GPIO.input(buttonPin)
   if inputState == False:
       count = count + 1
       print (count, "presses so far")
       time.sleep(.2)
except:
pass

finally:
GPIO.cleanup()

or

from gpiozero import Button
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
from time import sleep
GPIO.setup(12, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
count = 0
button = Button(12, pull_up=False)

try:
while True:
button.wait_for_press()
print("The button was pressed!")
count = count + 1
print (count, "presses so far")
  
except:
pass

finally:
GPIO.cleanup()
  

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