Portable Wireless Temperature Data Logger Dimitrios Tsiolchas

"AN AUTONOMOUS LOW POWER TELEMETRY SYSTEM FOR TEMPERATURE MONITORING AND DATA LOGGING" The objective of this final year project is the study and application of short range telemetry in the design and hardware implementation of an autonomous digital system for temperature sensing and data logging. The system features wireless interconnectivity between the portable sensing – data logging and monitoring components. The autonomous temperature data acquisition module, a fundamental component of the overall monitoring system, incorporates mixed-signal and ultra-low power microcontroller technology. Moreover, the overall system features integrated wireless telecommunications for logged data transmission and remote system configuration, using a programmable, low power, short range RF transceiver. The work for this project included the design and manufacture of the autonomous data logger printed circuit board using the EAGLE Layout Editor tool as well as the development and implementation of all necessary microcontroller algorithms using the Assembly programming language and the IAR Embedded Workbench V4.11B integrated development environment. In order to demonstrate system functionality, a simple supervisory and data acquisition software for the Microsoft Windows operating system platform was implemented, using the Visual C ++ 2008 programming language and the Microsoft Visual Studio 2008 integrated development environment. Individual fundamental objectives for this project were: 1) The design and implementation of electronic temperature measurement circuits applying mainstream methodologies while maximizing measurement accuracy. 2) The development of accompanying software algorithms, aiming to strike a balance between low power consumption and peak performance signal-data processing. 3) The study and application of appropriate wireless communication management methodologies, in order to develop and implement a data communication and transmission protocol tailored to the needs of the aforementioned prototype system. In the final stage of the project the autonomous temperature data logger prototype system was manufactured and tested. Its performance entirely satisfied all initial design and functional specifications, while some straightforward experimentation indicated that the desired accuracy to power consumption balance had been achieved. The implemented short range wireless communication channel, in particular more than satisfied the requirements of the targeted temperature data acquisition requirements.

Two ultra – low power microcontrollers of the same family (MSP430), carefully chosen and programmed to cooperate each other, in order to deal with the system’s operational requirements and specifications.
Analog platinum resistance temperature sensor (PT100) for great linearity at the sensor’s output relation between temperature and voltage drop measured, as well as for high accuracy measurements.
Integrated 16 bit ΣΔ – ADC peripheral in one of the mixed signal microcontrollers incorporating in this way a full Digital Signal Processing chain, specifically designed for slowly fluctuated analog signals and low uncertainty analog conversions with low power consumption.
Ferroelectric Non – Volatile Random Access Memories with SPI interface, for uninterrupted and fast data transactions and data logging, as well as low power consumption.

A digitally controlled, very low power and short range RF transceiver, operating in the ISM band of 2.4GHz (CC2500), equipped in its hardware with a sophisticated, real time programmable state machine for various operations such as radio control, data packet handling, configuration of channel’s parameters, signal quality and strength measurements, channel frequency calibration, etc..

Portable Wireless Temperature Data Logger Dimitrios Tsiolchas

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