This Project “Automatic Room Light Controller with Visitor Counter using Microcontroller AT89S52 continuously monitor the Infrared Receivers, When any . This Project ―Automatic Room Light Controller with Visitor Counter Output signal from AT89S52 is given to the base of the CHAPTER: 3. This automatic room light controller project with visitor counter is a reliable circuit based on the AT89S52 microcontroller. It takes over the task of controlling room.

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Skip to main content. Log In Sign Up. He has undergone the process of shodh yatraliterature survey and problem definition. At89e52 phenomenon remains same that no project ever can be executed proficiently and efficiently without sharing the meticulous ideas, technical expertise and innovative thought put forwarded by the technical and non technical veterans. This project would not have been possible without the efforts of the discrimination stood with us whenever any difficulty came to our way and provided us grate support.

We are very personally thanks to our internal guide is Mr. He has provided us a valuable guidance. When lock and keys become less safe, one can seek the help of electronic security systems. Such a portable security system is described here.

This electronic setup auto activated whenever the intruder enters to the unauthorized no entry area. It auto activate the landline number and redial the last dialed number from the conventional telephone.

All we need is to do minor changes to activate this telephone as it works as to become auto dialer circuit. Thus whenever the intruder enters to the area, it activates the sensor circuit of either sound activation or infrared light beam obstruction circuit, the redial circuit become active and give a ring tone to the receiving end. It may be a mobile phone or any landline phone or even police control room. List of Components 5. The objective of this project is to make a controller based model to count number of persons visiting particular room and accordingly light up the room.

Here we can use sensor and can know present number of persons. With the increase in standard of living, there is a sense of urgency for developing circuits that would ease the complexity of life.

Also if at all one wants to know the number of people present in room soaps not to have congestion, this circuit proves to be helpful. When somebody enters into the room will be switched ON and when any one. The light in room will be only switched OFF until all the persons in the room go out. The total number of person inside the room also displayed on the seven segment displays. The microcontroller does the above job. Micron roller AT89S52 continuously monitor the infrared receivers, when any object pass through the IR rays falling on the receivers are obstructed this obstruction is sensed by the microcontroller.


When somebody enters into the room then the counter is incremented by one and the light in the room will be switched ON and when any one leaves the room then the counter is decremented by one.

The light will be only switched OFF until all the persons in the room go out. The total number of persons inside the room is also displayed on the seven segment displays. It receives the signals from the sensors, and this signal is operated under the control of software which is stored in ROM. Mainly this block diagram consists of the following essential blocks.

Entry and Exit sensor circuit 3. AT 89S52 micro-controller 4. Relay driver circuit 1. The main function of this block is to provide the required amount of voltage to essential circuits. Enter and Exit Circuits: The main intention of this block is to sense the person.

For sensing the person and light we are using the light dependent register LDR. By using this sensor and its related circuit diagram we can count the persons. Theon-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. In this block mainly we are using the transistor and the relays. One relay driver circuit we are using to control the light.

Output signal from AT89S52 is given to the base of the transistor, which we are further energizing the particular relay.

Automatic Room light Controller with Visitor Counter | Neeraj Sharma –

Because of this appropriate device is selected and it do its allotted function. The stabl emultivibratorgenerates wt89s52, the automativ of which is determined by the circu it external to IC Theastable multivibrator does not require any external trigger to change the stateof the output. Hence the name free running oscillator. The time during whichthe output is either high or low is determined by the two resistors and a capacitor which are externally connected to the timer.

In this circuit, a negative pulse couhter at pin 2 triggers an internal flip-flop that turns off pin 7’s discharge transistor, allowing C1 to charge up throughR1. This circuit, in effect, produces a pulseat pin 3 whose width t is just the product of R1 and C1, i. The IC in the transmitter side is to generate 36 kHz square wave. The output goes high when there is an interruption coutner it return back to low a f t e r t h e t i m e p e r i o d d e t e r m i n e countet b y t h e capacitor and resistor countr the circuit i.

CL is to trigger theIC which is configured as monostable multivibrator. Input is given to the Port 1of the microcontroller. Port 0 is used for the 7-Segment display purpose. LTS Common Anode is used for 7-Segment display and that time Relay will get voltage and triggered, so light will get voltage and it will turn on and when counter will be 00 and at that time Relay will be turned off.


Reset button will reset the microcontroller. Microcontroller — AT89S52 2.

IC — 3. Transformer —mA 5. Disc autpmatic — ,33pF 7. Reset button switch 8. Rectifier diode — IN 9. Transistor — BC2N The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro- grammar.

By combining a versatile 8- bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications. Three level program memory lock 9.

Power off flag Full duplex UART serial channel Low power idle and power down modes Interrupt recovery from power down modes PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter.

The demodulated output signal visltor directly be decoded by a microprocessor. Photo detector and preamplifier in one package 2. Internal filter for PCM frequency 3. Improved shielding against electrical field disturbance 4. Output active low 6. Low power consumption 7. High immunity against ambient light 8.

Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For actable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one automstic. Timing from microseconds through hours 3. Operates in both as table and monostable modes 4.

Adjustable duty cycle 5. Temperature stability better than 0.

Automatic Room light Controller with Visitor Counter (AT89S52)

Normally on and normally off output 8. The LTS is a 0. This device utilizes Hi-eff. Low power Requirement 5. Each typeemploys internal current limiting, thermal shut down and safe operating areaprotection, making it essentially indestructible. If adequate heat sinking isprovided, they can deliver over 1A output current.

Although designed primarily as fixed voltage regulators, these devices can be used with external components toobtain adjustable voltages and currents. Output Current up to 1A 2. Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24V 3. Thermal Overload Protection 4. The relay requires 12 volts at a current of around ma, which cannot provide by the microcontroller.

So the driver transistor is added. The relay is used to operate the external solenoid forming part of a locking device or for operating any other electrical devices.

Normally there lay remains off. As soon as pin of the microcontroller goes high, the relay operates.