The PIR/Motion 3 in 1 Sensor is designed with three detecting sensors, (1)PIR/Motion,(2)temperature, (3)illumination 3 sensor , to detect movement within a protected area. When the detector is cooperated with security appliances, the detector is acting as a security device by detecting changes in infra-red radiation levels. If a person moves within or across the devices field of vision, a trigger radio signal will be transmitted to cause full alarm condition in order to frighten intruders away. Alternatively, when the detector is worked with Z-Wave Controller, the detector can be set to perform the role of home automation device by detecting both changes in infra-red radiation levels and percentage of lux levels. Once night falls, the percentage of ambient illumination is lower than preset value. If a person moves within or across the devices field of vision, a trigger radio signal will be transmitted so as to turn connected lightings for better illumination. Every time when PIR trig, the sensor will also send temperature and illumination value as well. Also the temperature will send out the value when temperature changes.