Vehicle and Passenger screening system!

Automatic Room Light Controller and Counter

Contents:AbstractBlock diagramsCircuit diagramApplicationFlowchartReference Abstract :This Project Automatic Room Light Controller with Visitor Counter using Micro controller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately. 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.In a nutshellAutomatic Person sensorCounterAutomatic Light and Fan ControlLCD display

Circuit Diagram :

Receiver :Circuit Diagram :Main Circuit:

Block diagram:Microcontroller89c51RelayLightLCDIR Sensor 1IR Sensor 2StartInfra Red Signal TxInterrupt from sensor 1Increment Entry Counter: Net=Nc+1If Net>0Interrupt from sensor 2Interrupt from sensor 2Decrement Entry Counter: Net=Nc-1Interrupt from sensor 1Relay OffRelay ONyesyesyesyesyesNo8Microcontroller:89c51Compatible with MCS-51 Products4K Bytes of In-System Reprogrammable Flash MemoryEndurance: 1,000 Write/Erase CyclesFully Static Operation: 0 Hz to 24 MHzThree-level Program Memory Lock128 x 8-bit Internal RAM32 Programmable I/O LinesTwo 16-bit Timer/CountersSix Interrupt SourcesProgrammable Serial ChannelLow-power Idle and Power-down Modes

IR SensorComprised of two parts - an IR emitting LED and an IR sensitive phototransistor5VDC operating voltage25mA supply currentOptimal sensing distance: 10 cmWidely used in line following robots

L7805:Voltage RegulatorIC 7805is a5V Voltage Regulatorrestricts the voltage output to5Vand draws 5V regulated powersupplyIt comes with provision to add heatsink.The maximumvalue for input to thevoltage regulator is 35V. It can provide a constant steady voltage flow of 5V for higher voltage till the threshold limit of 35V.

LCD :

Aliquid-crystal display(LCD) is aflat panel display,electronic visual display, orvideo displaythat uses the light modulating properties ofliquid crystals. A16x2LCDdisplay is a basic module and is commonly used in various devices and circuitsAdvantages: Economical, programmable, very compact and light etcMax232 :TheMAX232is an IC, that converts signals from anRS-232serial port to signals suitable for use inTTLcompatible digital logic circuits. The drivers provide RS-232 voltage level outputs (approx. 7.5V) from a single +5V supply via on-chipcharge pumpsand external capacitors. The receivers reduce RS-232 inputs (which may be as high as 25V), to standard 5VTTLlevels.

Software used: Kiel CThe Keil C51 C Compiler for the 8051 microcontroller is the most popular 8051 C compiler in the world.It allows to write 8051 microcontroller applications in C that, once compiled, have the efficiency and speed of assembly language. The C51 Compiler translates C source files into relocatable object modules which contain full symbolic information for debugging with the Vision Debugger or an in-circuit emulator.

Applications our project:Home automation For making Energy saving systemsFor counting purposesFor automatic room light control

MeritsLow costEasy to useImplement in single door

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

Future ScopeBy using this circuit and proper power supply we can implement various applications Such as fans, tube lights, etc.By modifying this circuit and using two relays we can achieve a task of opening and closing the door.

And heres the OUTCOME.!Thank You!