In this project, there are two sections (transmitter & receiver) as shown in the block diagrams. The instructions such as Left, Right etc are processed and are given by the person by operating PC. So based upon input of PC the following output will be seen i.e. left or right. In Transmitter Section, the instructions are delivered to Zigbee transceiver from microcontroller which is connected to the PC. This information is processed and is sent to the receiver section via wireless.
Embedded systems are designed to do some specific task rather than be a general-purpose computer for multiple tasks.Some also has real time performance constraints that must be met, for reason such as safety and usability; others may have low or no performance requirements, allowing the system hardware to be simplified to reduce costs. An embedded system is not always a separate block - very often it is physically built-in to the device it is controlling.
PC Regimented De fence Android using Zigbee project full documentt