Saturday, December 10, 2022

Car Reversing Audio Visual Alarm

Here is a simple car-parking alarm circuit based on an AVR microcontroller and an ultrasonic module. The circuit will alert you while you are reversing your car for parking, if there is any obstacle, through an audio visual alarm. -- By Md Arbab Zafar Danish

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Construction and testing the audio visual alarm circuit

An actual-size, single-side PCB for the car-reversing audio visual alarm circuit is shown in Fig. 3 and its component layout in Fig. 4.

Fig. 3: An actual-size, single-side PCB for the car-reversing audio-visual alarm
Fig. 3: An actual-size, single-side PCB for the car-reversing audio visual alarm
Fig. 4: Component layout for the PCB
Fig. 4: Component layout for the PCB
Fig. 5: Suggested sensor installation at the rear bumper
Fig. 5: Suggested sensor installation at the rear bumper

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Download the PCB layout & component layout PDFs: click here

Download source code: click here

BZZ_PartsAssemble the circuit on the recommended PCB to minimize assembly errors. Double-check for any overlooked error. Use proper IC base for the microcontroller. To test the circuit for proper functioning, verify correct 5V supply for the circuit at TP1 with respect to TP0.

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For initial testing, just switch on the circuit and move an object in front of the sensor module. When distance between sensor and object is about 200cm, LED1 would glow. When the distance is about 25cm only, all the LEDs (LED1 through LED8) would glow and the buzzer will start giving a continuous beep sound.

You can install the sensor module at the rear bumper of your car, as shown in Fig. 5. The LEDs (LED1 through LED8) and buzzer can be placed near the dashboard. The circuit should get switched on as soon as you place your car in reverse gear. As your car approaches an obstacle, more and more LEDs would start glowing. The audio visual alarm will give a continuous beep sound when distance between your car and the obstacle becomes 25cm or less.


The author is a B.Tech (electronics and communication). His interests include working with microprocessors and microcontrollers

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