Investigation and Implementation of Robust Wireless Zigbee Based Security System

This paper describes a monitoring system based on the Raspberry Pi 3 (RPi 3) and the Zigbee wireless sensor network (WSN). The system uses an XBee XB24CAPIT-001 radio frequency chip in order to create a low powered and reliable Zigbee connection to monitor a voltage loss in the system and to inform a customer about a triggering of the alarm system when the RPi USV+ and GSM SIM800 modules has been connected into the RPi. In order to make a system more robust, a random AES encryption key can be generated and periodically changed after each enabling of the security system or timer. The system can monitor the battery voltage in all Zigbee End Devices (ZED) and inform a customer by GSM network if a battery is becoming discharged. The proposed security system has a night mode feature with partial protection which allows a customer to be inside at night-time with the system armed. In the case that someone entered the building illegally, the proposed system can inform a customer by using an alarm siren or by text message to a smartphone. The entire application works in the background by using an application called daemon, thus a customer has the possibility to observe a system status or other events in the log file.