Table of Contents
Introduction:
A data logger is an attractive alternative to either a recorder or a data acquisition system in many applications. When compared to a recorder, data loggers can accept a greater number of input channels, with better resolution and accuracy. Also, data loggers usually have some form of onboard intelligence, which provides the user with diverse capabilities. For example, raw data can be analyzed to give flow rates, differential temperatures, and other interpreted data that otherwise would require manual analysis by the operator. The major difference between a data logger and a recorder, however, is the way the data itself is stored. analyzed and recorded. A common recorder accepts input and compares it to a full-scale value. The pen arm is then deflected across the recording width, to produce the appropriate ratio of the actual input to the full-scale input. For example, using a recorder with a 1 Volt full scale, an input of 0.5 Volts would move the pen 0.5/1 or 50% of the distance across the recording width. In comparison, a data logger accepts an input that is fed into an analog-to-digital converter before analysis and storage. This method has advantages in accuracy and resolution, while only a recorder can provide a truly continuous trend recording Now a day’s electronic devices become smaller and lower in power Requirements, and they are less expensive. we have begun to adorn our bodies with personal information and communication appliances. Such devices include cellular phones, pagers, personal digital assistants, and many more. But currently, there is no such method for these kinds of devices to share data. Networking these kinds of devices can reduce functional I/O redundancies and allow new Conveniences and services. Human society is entering an era of modern computing, when networks are smoothly interconnected. The implementation of ubiquitous services requires three levels of connectivity: Local Area Networks (LAN), Wide Area Networks (WAN), and Human Area Networks (HAN) for connectivity to personal information, sharing data, media, and communication appliances within the much smaller areas for communication. RedTacton is a technology that uses the surface of the human body as a high-speed and safe network transmission path. Here, the human body acts as a transmission medium supporting half-duplex communication at 10Mbit/s. Red Tacton technology is an electronic future where information can be accessible whenever and wherever needed at our fingertips. Some of the communication equipment that is required to provide this immediate access to information will be Incorporated into our attire. Just as a quick look at today’s wristwatch saves a trip to the nearest clock; a glance at tomorrow’s wristwatch will replace finding a terminal to check e-mail. RedTacton is a new Human Area Networking technology that was introduced by Nippon Telegraph and Telephone Corporation (NTT) that uses the human body surface as a high-speed and safe network transmission path. RedTacton is a Breakthrough technology that enables reliable high-speed HAN for the first time
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.
4X4 Keypad
A keypad is a set of buttons arranged in a block or “pad” which usually bears digits, symbols, and usually a complete set of alphabetical letters. If it mostly contains numbers then it can also be called a numeric keypad. Keypads are found on many alphanumeric keyboards and on other devices such as calculators, push-button telephones, combination locks, and digital door locks, which require mainly numeric input.
DTMF Encoder
The DTMF Encoder uses a radio frequency to transmit the control signals for generating the DTMF frequencies, a dedicated IC UM95089 (which is used as a dialer IC in telephone instruments) is used here. It uses a quartz crystal of 3.58 MHz
DTMF Decoder
This project uses the DTMF decoder UM 8870 IC. The DTMF decoder identifies the transmitted signal. If a valid code is received then only the switch sends the signal to the ARM controller, the ARM controller used is ARM7LPC2148.
MSP 430 Microcontroller
MSP low-power microcontrollers (MCUs) from Texas Instruments (TI) are RISC-based, mixed-signal processors that include smart analog and digital peripherals and offer several additional options such as low-power embedded RF and security such as AES encryption. MSP microcontrollers offer the ultimate solution for a wide range of low-power and portable applications.
Buffer
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
Driver
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.
Buzzer
A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devices, timers, and confirmation of user input such as a mouse click or keystroke.
Voice recorder:
The aPR33A3 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
This module consists of the RedTacton transmitter, RedTacton receiver, Driver, MSP430 controller unit, and Voicebank. RedTacton is a HAN; the body of a human being is used for the transmission of signals. RedTacton transmitter consists of a DTMF encoder that generates both valid and invalid signals and can be transmitted through the human body through the RedTacton receiver (DTMF decoder) for further processing. In the RedTacton receiver by the use of a DTMF decoder, the transmitted signal is identified.
The redaction transmitter consists of a data of a person whose data is to be logged in when he touches a redaction receiver the data is transmitted and compares the corresponding data which is previously faded into the controller.
As the transmitted signal is of very low voltage, buffers, and drivers are used to send the received signal to the electromagnetic switch. The electromagnetic switch checks the received signal with the predefined valid code. If an invalid code is received and detected in the switch then the buzzer starts ringing indicating that an unknown person is trying to enter into a particular location. If a valid code is received, then only the switch sends the signal to the main control unit which is the microcontroller, and the data of log-in is updated.
Advantages:
- RedTacton does not require the electrode to be in direct contact with the skin.
- Can transmit data at a rate higher than that of peer technologies. (max. of 10Mbps) and Security is more.
- RedTacton transceivers are programmable and we can decide what to share with whom and what devices you communicate with.
- Each communication occurs in separate channels.
- Transmission speed does not deteriorate even though the number of users increases. And More secure than Bluetooth.
- Data loss during transfer is less
- Superior to infrared technology & Wi-Fi
- No problem with hackers. It is very hard to pick up stray electronic signals radiating from the body.
Disadvantages:
- The obvious barrier to entry is that the cost and time to develop HAN TECH. are very expensive.
- As a new technology, HAN needs to gain popularity among users to help pull the technology into the marketplace instead of having it pushed upon them.
Applications:
- It can be used in corporate fields.
- In bank security
- In defense
