A motion sensing system is disclosed having a housing or mounting, a sensor, a shield and a cover. A spacer and a printed circuit board may also be included. The cylindrical shaped sensor is placed within the cup shaped shield with the spacer disposed between the sensor and the printed circuit board. The shield and the printed circuit board are then fastened together. Next, the bottom or nose of the mounting shield is placed into the dish shaped cover and the combination is fastened to the housing with the cover extending into an opening in the bottom wall of the housing. The system allows a downward looking motion sensing capability in addition to the typical forward sensing capability which may also be installed in the housing. The housing may then be connected to a security lighting fixture. An even simpler version is a motion sensing system having a simple mounting for a two transducer PIR sensor where one of the transducers is covered and a Fresnel lens is absent. An effective short range motion detector results and the sensor may be aimed in any direction.
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