Kit makes an Infrared Sensor that can detect the radiating body heat of a person or animal or infrared light. Detection of body heat can be sensed up to 18 feet away from the unit. The unit can be set up to set off an alarm or lights as desired. The unit uses PIR (Pyroelectri Infrared) sensor technology. You could even set this circuit up to turn on your railroad or model scene when someone stands in front of it!

When unit detects, the output can be set up to either a 0 or 5 volt DC signal suitable for interfacing with other logic level devices.