E. Voltage Regulator: The Digilab board can use any power supply that creates a DC voltage between 6 and 12 volts. A 5V voltage regulator (7805) is used to ensure that no more than 5V is delivered to the Digilab board regardless of the voltage present at the J12 connector (provided that voltage is less than 12VDC). The regulator functions by using a diode to clamp the output voltage at 5VDC regardless of the input voltage - excess voltage is converted to heat and dissipated through the body of the regulator. If a DC supply of greater than 12V is used, excessive heat will be generated, and the board may be damaged. If a DC supply of less than 5V is used, insufficient voltage will be present at the regulators output. If a power supply provides a voltage higher than 7 or 8 volts, the regulator must dissipate significant heat. The "fin" on the regulator body (the side that protrudes upward beyond the main body of the part) helps to dissipate excess heat more efficiently. If the board requires higher currents (due to the use of peripheral devices or larger breadboard circuits), then the regulator may need to dissipate more heat. In this case, the regulator can be secured to the circuit board by fastening it with a screw and nut .By securing the regulator tightly to the circuit board, excess heat can be passed to the board and then radiated away. When the supply voltage is less than about 2V above the desired output voltage, as is the case in low-voltage microprocessor power supplies, so-called low dropout regulators (LDOs) must be used. A. III. PROJECT MODEL IV. CIRCUIT OPERATION FIG 4.1:CIRCUIT DIAGRAM The solar panel is used to convert the solar energy absorbed from the sun to the dc current. This is given to the rectifier section to convert entire pure DC. This is given to 9v battery ISSN: 2231-5381 for charging. The intensity of solar energy is tested by led thus the battery is charged completely with the solar panel .This battery supplies energy for the circuit operation to turn the vehicle.The battery supplies power to the voltage regulator (which produces two kind of voltages 9v and 5v) through a filter which completely reduce the ripples to get pure DC. Which produces to voltages 9v and 5v given to the micro controller for its operation and 9v is supplied to the LDR (light dependent resistor). We operate the vehicle with a remote using IR sensor .This IR sensor is infrared with the micro controller (89c2051) along with the driver IC circuit .driver IC (ULN2803).the driver circuit pumped with a program for the operation of relays by receiving signals from microcontroller. We use keys in IR transmitter for moving a vehicle the IR receiver input from the IR transmitter it is passed to the micro controller and then to driver IC. According to the signal received from the micro controller the program is executed in the driver through which relays are operated. In use our project we use four 5v relays where:  First relay for moving front and back.  Second relay for moving right.  Third relay for moving left.  Fourth relay for producing sound horn. The motor and buzzer are operated with the relay. Thus the vehicle runs the regulator supplies 9v to the LDR (light dependent resistor) which works based on the intensity of light.It is given to a LED(head lights).where they are automatically ON during night times OFF during day and night times during moving of vehicle. A. IR REMOTE SWITCH: With most of consumer electronics, from camcorders to stereo equipment, an infrared remote control is usually always included. Video and audio apparatus, computers and also lighting installations, nowadays often operate on infra-red remote control. The carrier frequency of such