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The design uses ATZB-RF-212B-0-U Zigbit 900MHz wireless module that provide the zigbee communication protocol between the host system and I/O components. The AT89C2051-24PU 8-bit MCU manages the I/O components with the commands uploaded into it. It uses relay driver that supports the low voltage relay for switching the lamp. The system have proximity and temperature sensors that detects human presence and some related objects that need to be considered. The speaker can be used for alarm or delivering a simple signal or message. In the power supply side, it uses two Low DropOut (LDO) regulator to provide 3.3V and 5V while a 12V supply is also provided after diode bridge. The design can be used in energy saving system of commercial and residential applications. It can be used in industrial application but requires some modifications so that it will fit to the system.
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