When obstacle comes very near then IR rays transmitted by IR Transmitter are detected by less efficient IR Receiver #2 .Thus its output goes HIGH and which in turn energizes switching stage relay. This relay’s N/C pins are in series of power supply line of motor and hence motor is running in low speed when obstacle is detected in a safe distance. When obstacle is very near then relay gets energizes and contacts changes. This contact change breaks the power supply line of motor and hence motors stops running. Thus vehicle stops when obstacle is very near to it.

IR TRANSMITTER: This transmits Infra Red rays in pulse form towards front direction for detecting any obstacle. These rays are reflected back by hitting any obstacle and received by both IR Receivers.

IR RECEIVER: There are two IR Receivers, receiver #1 is normal in efficiency and receiver #2 is less efficient. The receiver #1 is used to detect safe distance obstacles and if found generates HIGH signal. The receiver #2 is used to detect very near obstacles and if found generates HIGH signal. Both High signals energize two separate relays for switching action.

VARIABLE POWER SUPPLY: This power supply is tapped for two power supplies, Normal and Low.

SWITCHING STAGE: This stage is comprised of two relays, one each for receiver #1 and #2. Both tapings of Variable Power Supply are connected to receiver #1 relay’s N/C and N/O pins. The Pole is connected to N/C pin of receiver #2 relay and its Pole is connected to power supply line of Motor.

POWER SUPPLY UNIT: The specially designed regulated power supply is needed for proper working of the system and hence this Power Supply Unit is constructed.