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Post: (This is a repost - I accidentally posted in the wrong forum previously.) I'm building a project that needs to read 32 buttons. I've modified demo_interruptsthreading.py to create two busses and threads to scan them but it's not working. Whichever bus I set as bus1 works as expected but bus2 doesn't trigger. Any help would be much appreciated. Here's the code: [pre][code]#!/usr/bin/env python """ ================================================ ABElectronics IO Pi | - IO Interrupts Demo Requires python smbus to be installed For Python 2 install with: sudo apt-get install python-smbus For Python 3 install with: sudo apt-get install python3-smbus run with: python demo_iointerruptsthreading.py ================================================ This example shows how to use the interrupt methods with threading on the IO port. The interrupts will be enabled and set so that pin 1 will trigger INT A and B. Internal pull-up resistors will be used so grounding one of the pins will trigger the interrupt using the read_interrupt_capture or reset_interrupts methods will reset the interrupts. """ from __future__ import absolute_import, division, print_function, \ unicode_literals import time import threading try: from IOPi import IOPi except ImportError: print("Failed to import IOPi from python system path") print("Importing from parent folder instead") try: import sys sys.path.append('..') from IOPi import IOPi except ImportError: raise ImportError( "Failed to import library from parent folder") def callback_function(bus): """ Function we want to call from the background_thread function This function will be called when an interrupt is triggered from a state change on pin 1 """ print("interrupt triggered") if bus.read_pin(1) == 0: print("pin 1 was set low") else: print("pin 1 was set high") def background_thread1(bus): """ Function we want to run in parallel with the main program loop """ while 1: # get the interrupt status for INTA inta = bus.read_interrupt_status(0) intb = bus.read_interrupt_status(1) # reset the interrupts bus.reset_interrupts() # check the value of intA to see if an interrupt has occurred if inta != 0 or intb != 0: print("Bus1", bus.read_pin(1), bus.read_pin(2), bus.read_pin(3), bus.read_pin(4), bus.read_pin(5), bus.read_pin(6), bus.read_pin(7), bus.read_pin(8), bus.read_pin(9), bus.read_pin(10), bus.read_pin(11), bus.read_pin(12), bus.read_pin(13), bus.read_pin(14), bus.read_pin(15), bus.read_pin(16)) callback_function(bus) # sleep this thread for 0.5 seconds time.sleep(0.01) def background_thread2(bus): """ Function we want to run in parallel with the main program loop """ while 1: # get the interrupt status for INTA inta = bus.read_interrupt_status(0) intb = bus.read_interrupt_status(1) # reset the interrupts bus.reset_interrupts() # check the value of intA to see if an interrupt has occurred if inta != 0 or intb != 0: print("Bus2",bus.read_pin(1), bus.read_pin(2), bus.read_pin(3), bus.read_pin(4), bus.read_pin(5), bus.read_pin(6), bus.read_pin(7), bus.read_pin(8), bus.read_pin(9), bus.read_pin(10), bus.read_pin(11), bus.read_pin(12), bus.read_pin(13), bus.read_pin(14), bus.read_pin(15), bus.read_pin(16)) callback_function(bus) # sleep this thread for 0.5 seconds time.sleep(0.01) def create_bus(address): # Create an instance of the IOPi class with an I2C address supplied iobus = IOPi(address) # Set all pins on the IO bus to be inputs with internal pull-ups enabled. iobus.set_port_pullups(0, 0xFF) iobus.set_port_pullups(1, 0xFF) iobus.set_port_direction(0, 0xFF) iobus.set_port_direction(1, 0xFF) # invert the ports so pulling a pin to ground will show as 1 instead of 0 iobus.invert_port(0, 0xFF) iobus.invert_port(1, 0xFF) # Set the interrupt polarity to be active high and mirroring enabled, so # pin 1 will trigger both INT A and INT B when a pin is grounded iobus.set_interrupt_polarity(1) iobus.mirror_interrupts(1) # Set the interrupts default value to 0 iobus.set_interrupt_defaults(0, 0x00) iobus.set_interrupt_defaults(1, 0x00) # Set the interrupt type to be 1 for ports A and B so an interrupt is # fired when a state change occurs iobus.set_interrupt_type(0, 0x00) iobus.set_interrupt_type(1, 0x00) # Enable interrupts for pin 1 iobus.set_interrupt_on_port(0, 0xFF) iobus.set_interrupt_on_port(1, 0xFF) return(iobus) def main(): ''' Main program function ''' bus1 = create_bus(0x20) bus2 = create_bus(0x21) timer1 = threading.Thread(target=background_thread1(bus1)) timer1.daemon = True # set thread to daemon ('ok' won't be printed) timer1.start() timer2 = threading.Thread(target=background_thread2(bus2)) timer2.daemon = True # set thread to daemon ('ok' won't be printed) timer2.start() while 1: """ Do something in the main program loop while the interrupt checking is carried out in the background """ # wait 1 seconds time.sleep(1) if __name__ == "__main__": main()[/code][/pre]