I'm trying to trigger a motion sensor on a door (for fun and to learn more about these systems) using Arduino based electronics (ca 5V, ca 50mA). According to Wikipedia, these sensors work at >4000nm wavelengths - can these be tripped using an Arduino as power supply - in theory / practice, or are there good reasons why this is a futile fun experiment to start with? I'm guessing a common infrared diode will not do the trick (ca 1000nm).