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Post: Hello Rhys If the sensors you are using output 5V then you will need to disable the internal pull-up resistors and set the port inversion to 0 so the inputs show as 1 when they are at 5V. Depending on the type of sensor you are using you may need to add a 10K pull-down resistor between each input and ground to pull the input to 0V when the sensor is not active. Without a pull-down resistor, the input could be left in a floating state where it will randomly jump between high and low. The code below should do what you need. I tested it on an IO Pi Plus with a 10K resistor connected between input 16 and ground and when the input is connected to 5V it shows the "Motion detected." message. [pre][code]#!/usr/bin/env python from IOPi import IOPi import time def main(): ''' Main program function ''' busin = IOPi(0x24) busin.set_port_pullups(0, 0x00) busin.set_port_pullups(1, 0x00) busin.set_port_direction(0, 0xFF) busin.set_port_direction(1, 0xFF) busin.invert_port(0, 0x00) busin.invert_port(1, 0x00) while 1: if (busin.read_pin(16) == 1): print("Motion detected.") else: print("") if __name__ == "__main__": main()[/code][/pre]