2.11 Proximity Detection Alert System

This project constructs a vehicle backup assistance system utilizing ultrasonic distance measurement and auditory warning signals to identify obstacles and deliver proximity-based feedback.

Ultrasonic distance sensors operate by transmitting high-frequency sound pulses and calculating the elapsed time for echo return from target objects. This temporal measurement enables precise distance computation through sound velocity calculations.

Required Components

  • Raspberry Pi Pico W x1

  • MicroUSB cable x1

  • 830 Tie-Points Breadboard x1

  • Ultrasonic Sensor HC-SR04 x1

  • Active Buzzer x1

  • Transistor S8050 x1

  • Resistor 1KΩ x1

  • Resistor 10KΩ x1

  • Capacitor 104 x1

  • Jumper Wire Several

Circuit Configuration

../_images/Reversing_Radar_Wiring.png

  • Ultrasonic sensor trigger pin interfaces with digital output GP14.

  • Echo reception pin connects to digital input GP15.

  • Audio alert buzzer links to digital output GP13.

Programming Implementation

Note

  • Follow the visual programming guide below using drag-and-drop techniques.

  • Load 2.11_Reversing_Radar.png from the directory Ultimate-Starter-Kit-for-Pico-W\Piper_Make. For comprehensive guidance, see Loading Existing Projects.

../_images/Reversing_Radar_Code.png

Upon Pico W connection, press the Start button to begin program execution. Position various objects at different distances from the ultrasonic sensor to observe buzzer tone variations corresponding to object proximity levels.

How it Works?

../_images/Reversing_Radar_Code2.png

Read the distance (in cm) of the ultrasonic detection, and store it in the variable [distance].

../_images/Reversing_Radar_Code3.png

When distance is less than or equal to 5, set the variable intervals to 0.1s. The variable [intervals] is the interval between buzzer sounds.

../_images/Reversing_Radar_Code4.png

When distance is greater than 5 and less than or equal to 10, set the [intervals] to 0.5s.

../_images/Reversing_Radar_Code5.png

When distance is greater than 10, set the [intervals] time to 1s.

../_images/Reversing_Radar_Code6.png

Finally, make the buzzer sound every [intervals] seconds.