Design and Implimentation of a Microcontroller Based Digital Thermometer

Abstract

In the field of healthcare, temperature monitoring has assumed a very vital role both in the management of patient's condition and general hospital storage facilities. Current advancements in the technology of temperature measurement have led to a huge variety of sensors and measuring instruments now being available for making accurate measurements. Most of the types available locally are the analogue type. In this work, a digital thermometer has been designed and constructed based on ATMega16 microcontroller using LM35 as the temperature sensing device. The design is in four modules; power supply, temperature sensor, LCD device and ATmega16 modules. While the ATmega16 forms the main control element, the temperature sensor senses the temperature to be measured and converts it to a corresponding analogue voltage. The measured temperature is displayed on a 16 by 2 Character LCD incorporated in the system. The system was tested and the results showed a mean deviation of from the readings when compared to a standard digital thermometer (ST-9269 MULTI-STEM THERMOMETER) reading. The thermometer is most suitable at higher temperatures.