Date of Defense



Electrical and Computer Engineering

First Advisor

Dr. John Gesink

Second Advisor

Dr. Garrison Greenwood


The design and testing of a microprocessor based temperature monitoring system is presented. The design and testing was performed to satisfy the senior design requirement for the BSEE degree at Western Michigan University.

Resistive Temperature Detector (RTD) is used to measure temperatures of gases and liquids during a manufacturing process. The RTD functions like a thermister and has a positive temperature coefficient.Its output is a voltage which corresponds to the temperature sensed. The microprocessor system will read this signal from the RTD, finds the temperature sensed from a look-up table in memory and converts it to an analog output with a range that is suitable for the next processing system. In addition, the microprocessor system is also designed to have the capability of measuring the differential temperature of two adjacent RTDs incorporated in its software. This system draws its supply from an external +28 V.

The monitoring system can be divided into the following three main sections. The first section performs the signal processing and consists of the RTDs, analog to digital converter, the microprocessor, the digital to analog converter, and the multiplexers. The second section is the output that ranges between the voltage of 0 V to 10 V. The third section consists of the power supplies for the various circuits.

Access Setting

Honors Thesis-Campus Only