automatic room power control

Category: Education

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ppt on automatic room power control


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A SEMINAR ON “Automatic Room Power Control” SUBMITTED BY Mr.Somvanshi Sumit D. Mr.Shinde Amol R. Mr.Padwal Vishal G. UNDER GUIDENCE OF Prof. V.S. Phatangare DEPARTMENT OF E&TC ENGINEERING PRAVARA RURAL ENGINEERING COLLEGE, Loni - 413736 Tal. Rahata , Dist. Ahmednagar , (M.S.), India 2011 – 2012

Automatic Room Power Control:

Automatic Room Power Control Under Guidance of Prof. V.S.Phatangare Submitted By: Mr. Shinde Amol R. Mr. Somvanshi Sumit D. Mr. Padwal Vishal G.

Project Definition & Need::

Project Definition & Need: In today’s world, there is a continuous need for automatic appliances with the increase in standard of living, there is a sense of urgency for developing circuits that would ease the complexity of life. This project is designed and developed to control the ac OR dc power on/off with automatic room light using LDR sensor.


Introduction: An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse and the lights go ‘off.’ But what happens when two persons enter the room, one after the other? It gets twopulses and the lights remain in ‘off’ state.

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The circuit uses two LDRs which are placed one after another (separated by a distance of say half a meter) so that they may separately sense a person going into the room or coming out of the room.

Block Diagram::

Block Diagram:

Circuit Diagram::

Circuit Diagram:


Working: Outputs of the two LDR sensors, after processing, are used in conjunction with bicolor LED in such a fashion that when a person gets into the room it emits green light and when a person goes out of the room it emits red light, and vice versa. These outputs are simultaneously applied to two counters. One of the counters will count as +1, +2, +3 etc when persons are coming into the room and the other will count as -1, -2, -3 etc when persons are going out of the room.

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These counters make use of Johnson decade counter CD4017 ICs. The next stage comprises two logic ICs which can combine the outputs of the two counters and determine if there is any person still left in the room or not. The LDR Sensors works on the principle of on obstacle generates pulse signal.

Advantages :

Any AC/DC device can work. Power can be Saved. Low cost . Easy to use . Implement in single door as per requirement. Advantages


It is used only when one single person cuts the rays of the sensor hence it cannot be used when two person cross simultaneously . Disadvantages


Applications: For automatic room light control For counting purposes(Using Microcontroller)


FUTURE DEVELOPMENT: Voice alarm system can be added to indicate that room is full & persons can’t enter inside. This helps in energy conservation.


In this paper we have proposed a design for automatic room light detection and control. We install an HLCM at every light of a family for home power management. The HLCM detects if a human body is present or not by using the PIR sensor circuit. If there is no human body present, all lights are turned off. If there is, the HLCM then detects the light intensity under the environment by using the light sensor circuit and the system maintains sufficient room light by switching lights on/off. To realize light intensity support and light pre-control, the RF technology for light power management has been integrated. Consequently, the potential of the features of low cost, small size, low power consumption and power saving has been shown. CONCLUSION:



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