CHAPTER ONE INTRODUCTION 1.1 BACKGROUND Temperature has been discovered to be the second most measured physical quantity, time been the First. This shows the need to measure temperature is very necessary, the measurement thus has to be efficient and convenient. Years back, crude methods were used in measurement of temperature of objects, colours and hotness of materials were used in temperature measurement for example colour red i.e., redness of material means it is hot. But this was not enough to measure the degree of hotness especially when you need to heat a particular material to a certain temperature. The need to assign values to temperature measurement led to the invention of the conventional mercury thermometer, though this method was widely accepted then, it was indirect and measurement was prone to errors. The need for accuracy and precision in measurement led to the digital thermometer, which is more accurate and helps eliminate parallax error during measurement. In this information era where the wired and wireless technology applications is widely used by lots of industries and hobbyists, group of experts make a research on how to implement 2 the use of these technologies in monitoring the temperature in a more precise and reliable way. Telemetry can be described as a highly automated communications process that involves the collection of measurements and other data at remote or inaccessible points prior to transmission to receiving equipment for monitoring and control purposes. The word telemetry is usually associated with wireless methods. Temperature telemetry is therefore the measurement of temperature of substances, things, physically inaccessible locations, and transferring the measured temperature value to a desired or more accessible location.

1.2 OVERVIEW OF THE PROJECT WORK As we know, radio frequencies refer to the frequencies that fall within the electromagnetic spectrum associated with radio wave propagation. When applied to an antenna, RF current creates electromagnetic fields that propagate the applied signal through space. Any RF field has a wavelength that is inversely proportional to the frequency and this means that the frequency of an RF signal is inversely proportional to the wavelength of the field. It goes the same with this project that used the application of radio frequencies by using RF transmitter and RF receiver to monitor the temperature of object under test. 3 The temperature of the object under test is sensed by an analogue temperature sensor IC (LM35DZ) and temperature is converted into equivalent voltage (which is about 0.01V/˚C) by the IC and it is in turn sent to the programmed ATMEGA328 microprocessor which processes the signal data and sends it to the remote end through the RF transmitter. At the remote end, the RF receiver collects the data and converts it into equivalent voltage and sends it to the programmed ATMEGA328 at the receiver side which does the analogue to digital conversion (ADC conversion), and the digital signal is sent to the Liquid Crystal Display (LCD) for measurement display.

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