#!/usr/bin/env python3
import RPi.GPIO as GPIO
import time
from sys import version_info
if version_info.major == 3:
raw_input = input
# ne555 pin3 connect to BCM GPIO18
SigPin = 18 # BCM 18
g_count = 0
def print_msg():
print ("========================================");
print ("| Ne555 |");
print ("| ------------------------------ |");
print ("| Output pin of ne555 connect to gpio18;|");
print ("| |");
print ("| Count the pulses procude by NE555. |");
print ("| |");
print ("| SunFounder|");
print ("======================================\n");
print ("Program is running...")
print ("Please press Ctrl+C to end the program...")
raw_input ("Press Enter to begin\n")
def count(ev=None):
global g_count
g_count += 1
def setup():
GPIO.setmode(GPIO.BCM) # Numbers GPIOs by physical location
GPIO.setup(SigPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Set Pin's mode is input, and pull up to high level(3.3V)
GPIO.add_event_detect(SigPin, GPIO.RISING, callback=count) # wait for rasing
def main():
print_msg()
while True:
print ("g_count = %d" % g_count)
time.sleep(0.001)
def destroy():
GPIO.cleanup() # Release resource
if __name__ == '__main__': # Program start from here
setup()
try:
main()
except KeyboardInterrupt: # When 'Ctrl+C' is pressed, the child program destroy() will be executed.
destroy()
