HI, this should be easy for the talented people here. I am using an PIR sensor that when activated by movement trips an MP3 player device that plays an audio file. The audio file plays approx. 45 seconds. Every time the sensor is activated by movement it starts playing the file from the beginning. If file is playing and sensor activates the file starts over. I need a simple way to have the sensor activate, start the audio file and let it play through completely, regardless of subsequent sensor trips during playback. Then once finished playing is reset and ready for next trip. Hope that makes sense.