This is the circuit diagram of car parking guard based IR sensor to detect the distance between car bumper and garage wall. this circuit which will help the person in the driving seat and give alarm if there is any obstacle or a wall while parking or while driving in reverse. While parking the car the driver should be more careful because he cannot see the back of the car while parking or taking reverse, if there is any obstacle and ran over it might be ?get damage to the car.
This circuit was designed as an aid in parking the car near the garage wall when backing up. LED D3 illuminates and the buzzer beeps when bumper-wall distance is about 100 cm. In this manner you are alerted when approaching too close to the wall.
All distances mentioned before can vary, depending on infra-red transmitting and receiving LEDs used and are mostly affected by the color of the reflecting surface. Black surfaces lower greatly the device sensitivity.
Simple Explanation:
Mount this car parking guard circuit at the back bumper and placed at the center. The piezobuzzer and LED indicator should be placed on the dashboard so the driver able to hear the sound alert clearly and can clearly see the indicator LED.
Make the connection to the reverse indicator light and the circuit in parallel and beware of the polarity (not to reserve).
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What is the range of photo Darlington transistor used in this circuit
what was the purpose of the lamp DS1??