In this tutorial, we are demonstrating a project of a Car reverse alert buzzer and flasher circuit. this circuit is used to indicate to any person, pets, or children standing or playing around your car that the car is reversing and they should get aside. Visual and sound indications are provided by flashing 8 bright LEDs and beeping a buzzer.
The circuit is simple and can be easily made and attached to the car battery. It is only using a few components like a reverse switch, 555 timer IC, buzzer, LEDs, and some discrete components. You just have to connect this with the vehicle’s battery through the reverse switch and it will be activated when you reverse your car.
Hardware Components
The following components are required to make Car Reverse Alert Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Battery | 12V | 1 |
| 2. | IC | NE555 Timer | 1 |
| 3. | Transistor | BD139 | 1 |
| 4. | Reverse switch | – | 1 |
| 5. | LED | – | 8 |
| 6. | Buzzer | 12v | 1 |
| 7. | Resistor | 10KΩ, 1KΩ, 330RΩ | 1, 2, 4 |
| 8. | Potentiometer | 100KΩ | 1 |
| 9. | Electrolytic Capacitor | 10µF | 1 |
| 10. | Ceramic Capacitor | 0.01µF | 1 |
NE555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
Car Reverse Alert Circuit
Working Explanation
The circuit is operated at 12 volts through a car battery, and is built around a NE555 IC. when the car is reversing the reverse switch will be on and the circuit will activate. The 555 timer IC will send a high signal from its output pin and send it to a BD139 transistor that is driving 8 super-bright LEDs and a buzzer. Now the circuit will provide LED flashes and a beep beep sound, to adjust the frequency of LED flashing and buzzer beeps we have used a 100K potentiometer. For best performance place this circuit in a small waterproof plastic box.
Applications and Uses
- Cars
- Jeeps
- Trucks
