RLE Compander for Wireless Sensor Data Processing.

RLE data compression is effective when the measured signals are expected to be slow and repeatable. The task of this unit is crucial to the system power performance. RLE is a conceptually simple form of compression. RLE consists of the process of searching for repeated runs of a single symbol in an input stream and replacing them by a single instance of the symbol and a run count. The aim of this paper is to model and design an efficient embedded wireless system that is easy to integrate with other technologies or infrastructures at a low cost. The system would read analogue information recorded by sensors (physical parameters) in a transmitting unit attached to the system. The recorded data are converted digitally using analogue-to-digital converter and sent to on/off frequency shift keying (FSK) transmitter through Micro controller interfaced to the system. System functions such as bus interfacing, data buffering, compression and data framing are implemented in Embedded C software. Remotely connected second Micro controller is interfaced to the output of the receiver and is responsible for processing the data inversely like de-framing and de-compressing. This system may be used as general-purpose wireless sensor data compressing and processing in many fields of interest such as mineral processing, patient monitoring, sensor data instrumentation, Bio medical instrumentation and radar sensor data processing etc. The data transmission and reception are implemented effectively with packet based communication protocol with data integrity. In this project we used the HDLC (High Data Link Controller) protocol, this unit is considered to be the main core of the system model, where the data are grouped into frames and sent to the transmitter. HDLC. This project implementation includes various hardware and software modules: Micro controller, LCD display, keyboard, encoder/decoder, RF modems and RPS design and embedded firmware modules to drive hardware modules