DESIGN AND CONSTRUCTION OF AN AUTOMATIC TEMPERATURE CONTROL FOR HEATING DEVICES WITH ALERTING SOUND SYSTEM

Abstract

This project is on the design and construction of an automatic temperature control for heating devices with alerting sound. The motivation behind this project is to improve on the design and construction of a temperature controller incorporating visual indicator (visual alert) and audio (sound) alert as the desired temperature is reached. The introduction of automatic control system brought about the elimination of human error during temperature control process. This project makes use ofLM35 (centigrade sensor) which senses temperature from the heating element and converted it to its equivalent voltages. The output ofLM35 is compared with a reference voltage level by a comparator whose output controls the relay via the Schmitt trigger operation. This project works perfectly within the room temperature and the boiling temperature of water.