Table of Contents
Introduction:
Zigbee Is a wireless technology developed as an open global standard to address the unique needs of low-cost, low-power, wireless sensor networks. Zigbee Is the set of specs built around the IEEE 802.15.4 Wireless protocol. As Zigbee Is the upcoming technology in the wireless field, We had tried to demonstrate its way of functionality and various aspects like kinds, advantages, and disadvantages using a small application for controlling any kind of electronic devices and machines. The Zigbee Technology Is broadly adopted for bulk and fast data transmission over a dedicated channel. This Project Consists of Zigbee Based system that transmits wireless signals according to the input given by the user using a touch screen. At The receiver(air hostess) End the information will be displayed on LCD In the English language. Here When a user sends his need through the touch screen, the microcontroller transmits that information through a Zigbee transmitter. The Information received by the Zigbee Receiver will be displayed on LCD.
Microcontrollers. Microprocessors are commonly referred to as general-purpose processors as they simply accept the inputs, process them and give the output. In contrast, a microcontroller not only accepts the data as inputs but also manipulates it, interfaces the data with various devices, controls the data and thus finally gives the result. The Project Touch Screen and Zigbee Based wireless communication assistant for Dumb/Illiterates people.
Block diagram explanation :
Power supply unit:
This section needs two voltages viz., +12 V & +5 V, as working voltages. Hence specially designed power supply is constructed to get regulated power supplies.
Zigbee technology:
ZigBee is the name of a specification for a suite of high-level communication protocols using small, low-power digital radios based on the IEEE 802.15.4 standard for wireless personal area networks (WPANs).
- A very low-cost, low power consumption two-way, wireless communication standard for automation, toys & PC peripherals.
- Low power consumption: 6 months to 5 years battery life for most applications.
- Low cost: At least half the cost of Bluetooth solutions.
- The high density of nodes per network: 250 nodes per network, multiple co-located networks.Data rate requirements: Few bits to 250kbps sufficient.
ARM processor:
ARM is a computer processor-based RISC architecture. A RISC-based computer design approach means ARM processors require significantly fewer transistors than typical processors in average computers. This approach reduces costs, heat, and power use. The low power consumption of ARM processors has made them very popular:
The ARM architecture (32-bit) is the most widely used in mobile devices, and the most popular 32-bit one in embedded systems.
ARM processor features include:
- Load/store architecture.
- An orthogonal instruction set.
- Mostly single-cycle execution.
- A 16×32-bit register
- Enhanced power-saving design.
Buffers:
Buffers do not affect the logical state of a digital signal (i.e. a logic 1 input results in a logic 1 output whereas logic 0 input results in a logic 0 output). Buffers are normally used to provide extra current drive at the output but can also be used to regularize the logic present at an interface.
Drivers:
This section is used to drive the relay where the output is the complement of input which is applied to the drive but the current will be amplified.
Relays:
It is an electromagnetic device that is used to drive the load connected across the relay and the o/p of the relay can be connected to the controller or load for further processing.
Voice Chip:
The aPR33A series are powerful audio processors along with high-performance audio analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). The aPR33A series is a fully integrated solution offering high performance and unparalleled integration with analog input, digital processing, and analog output functionality. High-quality audio/voice systems with lower bill-of-material costs can be implemented with the aPR33A series because of its integrated analog data converters and a full suite of quality-enhancing features such as sample-rate converters.
In this messages must be recorded or played back sequentially, specially designed for simple key triggers, the user can record and playback the message. Meanwhile, this mode provides a power-management system.
Methodology:
The transmitter will have Touch plate sensors, when touching the particular touch plate that is detected then it gives the signal to the ARM, then the ARM will send the information to another receiving station through ZIGBEE. At the same time, ARM will generate the output that is fed to buffer IC 4050, buffer stores and given to the driver IC 2003 in driver current will amplify and voltage will invert with the help of the Darlington circuit of driver IC to drive the relay. Then the signal is given to the output load for indication purposes.
When ARM receives the data from the Zigbee, it will enable the alert through announce which is stored information voice chip for particular touch plates…
Advantages:
- Very useful even for illiterates.
- Voice-based user input.
- Faster and more secure data transmission.
- User-friendly and easy to install.
- Helpful abroad to express user needs.
Disadvantages:
It increases the cost whereas digital systems reduce the cost of the system.
Applications:
- Smart Energy
- Health Care
- Home Automation
- Security services
- Communication and device discovery
