Design And Construction Of A Light Activated Switch

ABSTRACT

This project presents a light activated switch for switching on and off electrical appliances

using light dependent resistor (LOR) for its operation. The light dependent resistor changes or

varies resistance with change in the intensity of light hitting its surface, this in turn is passed

through a comparator to determine if the light intensity can be said to be day through the

resistance entering the comparator. It can however be programmed to act as a light activated

switch or as a dark activated switch. In the case of this project, it is working as a light

activated switch. It is to turn on automatically when there are rays from the sun and it's to

turn off automatically when it is dark. As such, power wastage or accidental fire outbreak can

be avoided. Thus, the overall aim of the project is achieved.

In furtherance to this research, future works on improving the work is advised. This includes

making the LDR more or less reactive to sunlight. So far, the project also turns on and off

from direct rays from other sources of light. Carrying out advanced research to avoid this isvalso recommended.