GPIO RISING and FALLING - Raspberry Pi Forums

hi,
i've started playing gpio , python, i've put following code

code: select all

#!/usr/bin/python import time import rpi.gpio gpio gpio.setwarnings(false) gpio.setmode(gpio.board) gpio.setup(26, gpio.out, true) gpio.setup(23, gpio.out, false) gpio.setup(24, gpio.in) alerts=0  def alert_reset(channel):     global alerts     alerts -= 1     if alerts < 1:         gpio.output(23, true)         alerts = 0  def alert(channel):     global alerts     alerts += 1     if alerts > 0:         gpio.output(23, false)         localtime = time.asctime( time.localtime(time.time()) )         print "triggered :", localtime  gpio.add_event_detect(24, gpio.rising, callback=alert, bouncetime=300) gpio.add_event_detect(24, gpio.falling, callback=alert_reset, bouncetime=300)  try:     while true:         gpio.output(26, false)         time.sleep(1)         gpio.output(26, true)         time.sleep(0.1)         gpio.output(26, false)         time.sleep(0.1)         gpio.output(26, true)         time.sleep(0.2) except keyboardinterrupt:     gpio.cleanup() gpio.cleanup() 

, receive following error

traceback (most recent call last):
file "/root/test.py", line 27, in <module>
gpio.add_event_detect(24, gpio.falling, callback=alert_reset, bouncetime=300)
addeventexception: edge detection enabled gpio channel

can't assign .rising , .falling same channel , .both should work instead, have no idea how detect inside function whether .rising or .falling.
idea have multiple sensors using same function.
ideas welcome.
thanks.

just read state of gpio. if falling state false.

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