Automatic Street Light Controller Using TRIAC

Abstract

This project is developed for the users to control the operation of a street light automatically. It consists of three modules. 1. Light sensor 2. Inverting section 3. Tube light The sensor senses the availability of light. When the intensity of the light decreases(night), the sensor sends signal to the driver transistor. The driver transistor switches on the inverting section. The inverting section consists of two ICs CD4047 and ULN2004. It converts DC to desired AC. The step up transformer steps up 12 V AC to 230 V AC. When the intensity of light increases(morning), the sensor sends no signal to the driver transistor and thus it switches off the inverting section. Thus the light will be automatically switched on when the intensity of sun light is low and the light will be automatically switched off when the intensity of sun light is high. This project is cost effective and portable. The user can take this while traveling.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM