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button_interrupt.py
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button_interrupt.py
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#!/usr/bin/env python
# Copyright (c) 2019-2022, NVIDIA CORPORATION. All rights reserved.
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
import RPi.GPIO as GPIO
import time
# Pin Definitions:
led_pin_1 = 12
led_pin_2 = 13
but_pin = 18
# blink LED 2 quickly 5 times when button pressed
def blink(channel):
print("Blink LED 2")
for i in range(5):
GPIO.output(led_pin_2, GPIO.HIGH)
time.sleep(0.5)
GPIO.output(led_pin_2, GPIO.LOW)
time.sleep(0.5)
def main():
# Pin Setup:
GPIO.setmode(GPIO.BOARD) # BOARD pin-numbering scheme
GPIO.setup([led_pin_1, led_pin_2], GPIO.OUT) # LED pins set as output
GPIO.setup(but_pin, GPIO.IN) # button pin set as input
# Initial state for LEDs:
GPIO.output(led_pin_1, GPIO.LOW)
GPIO.output(led_pin_2, GPIO.LOW)
# By default, the poll time is 0.2 seconds, too
GPIO.add_event_detect(but_pin, GPIO.FALLING, callback=blink, bouncetime=10, polltime=0.2)
print("Starting demo now! Press CTRL+C to exit")
try:
while True:
# blink LED 1 slowly
GPIO.output(led_pin_1, GPIO.HIGH)
time.sleep(2)
GPIO.output(led_pin_1, GPIO.LOW)
time.sleep(2)
finally:
GPIO.cleanup() # cleanup all GPIOs
if __name__ == '__main__':
main()