Robotics projects

Reverse Car Parking Sensor Project using Havi Elements

Last Updated: 05/08/23 0
reverse parking sensor alarm project

Aane de… Aane de…. Aane de……

You must have seen as well as been in this situation. Someone is driving the car in reverse and Dadaji or Buaji is guiding them, especially while parking a car in reverse.

But you might have also observed one or many of the following features in a car.

  1. A car that beeps or plays a tune while driving in reverse to keep the driver alert.
  2. A car that beeps when an obstacle, like a wall, is approaching.
  3. The rear of the car displayed on the media screen, along with drawings showing the car’s coverage, allowing you to see if something is in the car’s path.
  4. A car that stops by itself if it is about to approach a wall or a pole.

Cars have become smarter and smarter with these advanced features, reducing the need for someone to guide you with “Aane de….” and increasing the overall safety of the vehicle and its occupants.

Now, let’s build a working model of a reverse car parking sensor project using Havi elements and also understand how this system works.

What is reverse parking sensor

Reverse car parking sensors are tiny electronic devices that can be placed at the rear bumper of a car. They measure the distance between the rear bumper and the object in front of it.

If the minimum safety distance is breached, the sensor activates safety measures, which can be a beep, a tune, or a brake, in the case of smart cars.

Which sensor is used in reverse car parking?

IR sensor, Ultrasonic sensors, motion detectors and cameras can be used as reverse car parking sensors. Each of them do have different features and purposes.

We will use IR sensors to build our reverse car parking sensor project.

What is the objective of a car parking sensor?

The top most objective of a car parking sensor is to prevent the damage or loss of vehicle, properties and lives of humans.

Making of car parking sensor project

What will you need?


Power – 1
IR pair(IR controller & IR LED with 3 pin cable) – 1
Motor – 2
Flip – 1
Buzzer – 1


Power bank with USB cable
Geared motors – 2
Roller – 1
Car plate

Craft material:

Ice cream stick
Double sided tape

You can find all these components in the Havi Elements – DIY Robotics Starter Kit. Purchase this kit and create a reverse car parking sensor along with 93 other projects.

Alternatively, you can also find these components in the Havi Elements – DIY Robotic Toy Car, which allows you to build 41 DIY projects.

The making

Step: 1 Building a car

Let’s begin the creation process by building the car first. You can refer to the instructions on “How to make a DIY robotic toy car using Havi elements” to learn how to construct the car.

You can please refer to the following video too.

Step 2
Version 1: Alarm system

First, let’s create a basic reverse parking alarm system that activates the alarm when the car comes closer to a wall or any other object.

Prepare the reverse car parking sensor circuit as follows:

reverse parking alarm project havi elements

  1. Attach a piece of double-sided tape (DST) at the bottom rear side of the car plate.
  2. Stick one edge of the ice cream stick on that piece of DST.
  3. Connect the circuit to a power bank.
  4. Place and attach the circuit and power bank over the car plate using DST.
  5. Connect the geared motors with the motor elements.
  6. Connect the IR LED and IR controller using a 3-pin cable.
  7. Stick the IR LED on the other edge of the ice cream stick.

reverse parking alarm project havi elements
Next, adjust the sensitivity of the IR sensor using the potentiometer. The sensor should detect the wall from a maximum distance, so set it to maximum sensitivity.

Adjust the motor switches so that both motors rotate in the backward direction.

Now, our reverse car parking sensor project with an alarm is ready. Turn the power ON, and the car will start moving backward. As the car approaches the wall, the buzzer will sound, serving as an alarm to alert the driver about the approaching obstacle. However, in our case, the car will remain uncontrolled and may hit the wall.

reverse parking alarm project havi elements
Version 2: Smart reverse parking sensor

What if we want to create a smart car that stops automatically when approaching a wall?

Let’s now prepare a smart reverse parking sensor project in which the car will stop by itself and activate the buzzer. However, if you want to eliminate the buzzer, you can do so.

Modify the circuit as shown here.

reverse parking alarm project havi elements
reverse parking alarm project havi elements
Turn the power ON, and the car will start moving backward. As the car approaches the wall, the buzzer will sound, and the motors will stop rotating.

reverse parking sensor project havi elements

How do car parking sensors work?

Do you know how the IR sensor works? Checkout here.

Version 1: The alarm

In the first case, the IR sensor will detect an object and send a “Yes” signal to the buzzer. Buzzer will turn on and will make the sound. However motors are not under control of the IR element hence will continue working normally.

Version 2: The smart stop

In the second case, We bring motors under the control of IR+Flip and the buzzer under control of IR.

When there is no object in the way, the IR sensor will release a “No” signal to the buzzer. The buzzer will remain off and forward the “No” signal further to Flip. Flip will receive the “No” signal, flip it to the opposite (“Yes”), and pass it to the motors. As a result, the motors will remain on.

However, when the IR element detects an obstacle, it will send a “Yes” signal to the buzzer. The buzzer will turn on and pass the signal to Flip. Flip will invert the signal to “No” and transmit it to the motor elements. This will make the motor elements stop, causing the car to come to a halt.

That’s a smart reverse mechanism using an IR sensor.

What are the benefits of reverse parking sensors?

The alarm mechanism alerts the driver for the upcoming obstacle while the smart reverse sensor delivers much more. That prevents accidents to happen as it stops the car by itself.

School students can prepare some impressive craftwork and present this project in their school science fairs. Check out the example below.

reverse parking sensor craft project
What else can we do to make reverse car driving safer? What other car safety projects can you make using Havi elements? What else can you do with this same circuit?

Think, play, and learn….till we come back with a new post.

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