Charles Craft mindspring.com> writes: > Short of building a robot with an IR LED that moves around the room any > thoughts on > how to trigger the sensor with a static piece of hardware? The IR equipped robot would not help, wrong wavelength and too small. A small computer fan with some blades removed spinning on reduced voltage and a power resistor on a heatsink underneath with thermostat set to 40 deg C should do the trick. The box should not be too small, nor the fan. Pocket book size should work, or make one you can tape on the PIR "eye". The fan chopper should not be faster than 10Hz. There are no LEDs for the 10um IR wavelength range on the market afaik. PIR triggered room lights and A/C units are evil and cheap, some are counting direction type (mounted to view the only entrance, they count people entering and exiting), that is less evil but occasionally miscounts in one direction or in the other. Instead, "occupancy sensors" exist for that purpose. Some use the principle of the sensors in contactless IR thermometer and do not require contact or motion to exist (dual band far IR), but they are expensive and less frequently used. See for example MLX90614 from Melexis. -- Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist