Mini Project : Autonomous Light Intensity Controller


Mini Project for ECE and EEE :

Excerpts From the Report

Introduction

Illumination systems occupy a central theme when it comes to designing any system that involve the masses, designing an efficient system in this field has undergone research over the past century, resulting in the development of efficient light sources and so and so forth, the entire research in this field can be converged into two schools of thought, the first would be to develop illumination systems that produce light efficiently, this involves better light sources, say leds compared to incandescent lamps, this also includes systems that rely on the inherent properties of light, so that the energy, available is not only converted the more into light, but the light produced can be environment specific, say polarised or unpolarised light etc.. to meet the best requirements of the user, the other school of thought relies on efficient energy conversion and use, this involves development of systems that depends on the user’s limitations and choice and is relatively a new arena, with limited developments made, it relies on biometry and other relatively new sciences, but integrating these into efficiency improvement programs can do great work, because after all the appliances are used by the user, and if it is user specific, the less of wastage it can cause compared to a general system. In this project we are dealing with the special case of eye, which neglects excessive intensity above a particular threshold, which is fixed by parameters such as focus, environment, user state etc ,but these can be generalised to converge upon user specific bands, which tend to serve a larger population, so whenever we have environments which involve masses this data can be used to efficiently control and provide only the required amount of the utility, in this case light. 

Problem Statement 

These are the objectives of our project, what we have worked on and what we are demonstrating. 
  • Develop a system that measures the intensity of the ambient light and feed it into the microcontroller (analog signal) -> input side 
a.) For demonstration purposes only two states, high intensity and least intensity case is taken… 
  • Develop a system that can vary the intensity of a light bulb (100W,230V) -> output side 
a.) Classical Dimmer circuit is made use here, where a diac is used to trigger a triac, the diac firing is controlled by varying ‘RC’ time constant (working model),the resistance is varied by using a motor. 
b.) A bridge rectifier can be used, whose firing angle can be controlled, so as to generate required RMS voltages (Study) 
  • Develop a system that generates control signals based on the signal from the input side, for the output side -> control side 
a.) Using a microcontroller (ATMega16L) to generate control signals based on pupillary response data, which is fed in a priory ,real time data sampling and processing of human pupil aperture is a feasible system, but is limited by the time frame allotted for this project.

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