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