Real Time Temperature Monitoring

Jorge Silva

doi:10.24840/2183-6493_003.003_0005

Abstract

The purpose of this project is to measure the temperature through a thermistor inserted into a properly sized circuit.This implementation was designed to be possible, given the characteristics of the used sensor, a measurement in the range of -5 to 270 oC, although the temperatures of interest of this application are between 18 and 35 oC.For the analysis of this measure, as well as for the control, an application was developed in MatLab. This software allows, not only programming and processing the acquired signal, but also serves as a graphical interface where it is possible to monitor the entire process in real time. For the acquisition of the analog signal, was uses an Arduino UNO board.Inside of the MatLab environment, a screen has been developed that allows visualizing the temperature evolution in real time, as well as verifying if it is inside the stipulated limit. The developed application also allows the system to stop and store test data in a file for later calculations.For a better framing, this circuit can be considered as a system developed for temperature control of a typical classroom.That being said, the is then to control the temperature, stipulating limit values, to visualize its evolution in real time through an indicator and a graph and to collect data for later calculations.

Highlights

In the framework of the project, measuring temperature becomes an extraordinarily important factor, because in this case the fact that it can reach higher values can lead to a heating of an entire system, as well as could cause serious damage
The final result of the project was translated into what was proposed in the objectives, initially and in the long term of the project: a graphic screen that allows monitoring in real time the temperature (Figure 6)
In the same screen is possible to see the acquired signal over time, a variation of the temperature as a function of the resistance and the voltage, numerical indicators that indicate the value of the temperature, voltage and resistance, display that changes color depending on the state of the process, and a stop button that allows to close the cycle

Summary

Introduction

In the framework of the project, measuring temperature becomes an extraordinarily important factor, because in this case the fact that it can reach higher values can lead to a heating of an entire system, as well as could cause serious damage. This work has the great advantage of connecting the MatLab and Arduino software, when associated to an acquisition circuit. There are phenomena that are influenced by temperature, and are used to measure it: variation of resistance of a conductor (resistance probes - RTD's); resistance. Real Time Temperature Monitoring Temperature - Measurement through a Thermistor Inserted into a Properly Sized Circuit using MatLab and Arduino Platforms Jorge Silva variation of a semiconductor (thermistors); f.e.m. created in the union of two metals (thermocouples). The application discussed in this article was developed with the use of an NTC thermistor (Negative Temperature Coeffcient) as a sensor, which has temperature-dependent resistance inversely proportional. NTC thermistor Thermistors, or thermal resistors (temperature sensitive resistors), are semiconductors with high thermal resistance coefficients (Figure 1)

Objectives

Methods

Results

Conclusion