IJSRD - International Journal for Scientific Research & Development| Vol. 4, Issue 11, 2017 | ISSN (online): 2321-0613 All rights reserved by www.ijsrd.com 202 Intelligent Automatic Street Light Control System Vismita Kolvekar 1 Valerie Vaz 2 Fatima Shaikh 3 Jyoti Kumari 4 Michelle Araujo E Viegas 5 1,2,3,4 UG Student 5 Head of Dept. 1,2,3,4,5 Department of Electronics & Telecommunication Engineering 1,2,3,4,5 Don Bosco College of Engineering, Goa, India Abstract— This paper aims at designing and executing the advanced development in embedded system for energy saving of street lights. Nowadays, human have become too busy and are unable to find time even to switch off the lights wherever not necessary. The present system is like the lights are switched on in the evening and they are switched off next day in the morning. This paper gives the best solution for electrical power wastage. Also the human effort required is minimised. The paper basically uses two sensors namely LDR (Light Dependent Resistor) and the IR (Infrared) sensor; the LDR will be used to detect whether it is the day or night time and IR sensor will help in finding if the object is present or not. The Raspberry Pi will act as brain to control this system which uses Python programming language. This system is successfully implemented as prototype system. Key words: LDR, IR Sensor, Raspberry PI, Street Lights, Energy Saving I. INTRODUCTION For designing any new system for the streetlight that does not consume huge amount of electricity and provides sufficient light for large area is a big challenge for every engineer. An important component of power consumption worldwide is street lighting. India is no different. [1] Global trends in street lighting show that 18-38% of the total energy bill goes towards street lighting and therefore this is one domain that needs major attention if we look at improving efficiency of power consumption with an objective of saving energy. In most cities, the street lights are installed and maintained by municipalities. Very often, one notices that the street lights stay on well past sunrise. This is because the lights are switched off based on a pre-decided time rather than lighting needs, which vary based on season and location of the city. There is a need for devising a well thought out way to prevent wastage of electricity. Manual control is prone to errors and leads to energy wastages and manually dimming during mid night is impractical. Also dynamically tracking the light level is manually impractical and the current trend is automation for controlling the street lights [2]. There are various controlling methods such as design of CPLD based solar power saving system for street lights and automatic traffic control [1], design and fabrication of automatic street lights [3], automatic street light intensity and road safety module using embedded system [4], automatic street light control system [5], Intelligent street light system using GSM [6], energy consumption and saving solutions based on intelligent street lighting control system [7]. In this paper two kinds of sensor will be used light dependent resistor (LDR) and IR (Infrared) sensor. The LDR will basically check if it is day or night which will be used to activate the ON/OFF switch. This switch will help in turning ON/OFF the street lights. The IR sensor will basically help in determining any movement in the area and then in the required condition help in activating the street lights. If the LDR detects it is night and also the IR sensor senses some object at the same time then the street lights become activated else they remain switched off. The IR sensor will be placed along the road side and will be controlled using the microcomputer Raspberry Pi. If any object crosses the IR sensor particular light will be ON automatically. This will form the basic principle for the automation of street lights in any place. The block diagram of street light system is shown in Fig. 1. The block diagram consists of microcomputer, LDR, IR sensor and LEDs. By using LDR we can operate the lights i.e. when light is available the LED will be OFF and when light is not available (dark) LED will be turned ON which means that LDR is directly proportional to light. When light falls on LDR it sends the signal to the Raspberry Pi to turn off the light and this switches of the light even if the IR sensor has high output. The IR sensor will be basically used to turn ON and OFF the lights according to the presence of the objects during the night time. All the commands from the LDR and IR sensor will be sent to Raspberry Pi and the normal function will occur depending on the signals received from the sensor. Fig. 1: Block Diagram for automatic street lights IR sensor draws 5v from pi and LDR requires about 9 V and a single LDR is used as master sensor for a number of street lights in an area eliminating the need for large number of LDR sensors hence it is cost effective. The sensor gives an output voltage of 3.3 V which is supplied to the Raspberry pi. II. MATERIALS REQUIRED A. Light Dependent Resistor (LDR) The theoretical concept of the light sensor lies behind, which is used in this circuit as a darkness detector. When the LDR detect light its resistance will get decreased, thus if it detects darkness its resistance will increase. The LDR is a resistor as shown in Fig. 2. When light falls i.e. when the photons fall on the device, the electrons in the valence band of the semiconductor material are excited to the conduction band. These photons in the incident light should have energy