 ESP32 Based Parking Assistant V3 

ESP32-C3

Arduino IDE

<html><body><figure><iframe src="https://www.youtube.com/watch?v=rqTDj7GabGw"></iframe></figure>The ESP32-C3 Based Parking Assistant is an advanced parking sensor system that utilizes the ESP32-C3 super-mini micro-controller to provide accurate distance measurements and parking assistance.This is the third iteration of my previously released parking assistant videos.This parking assistant system uses ultrasonic sensors to help drivers park their vehicles accurately by providing visual and audible feedback about distance to the obstacles.<h3>Components Required</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNYPQGW54nMv8hGuSP2-pnkshc9zKfF-dHXMp7JVZcWy8bvisgq2wzesT3a2LRngLYum6O9KSkk2DsdtKspQgpABehHVk9SiDqU9KTtsu8HgJEkJQfvi9V9CoTse-qRKoNz-3VNmFC2Xkp09Z_py6MV_gnrCbr5QMESl68A3WbhvDEqAyKd_aQidwejZAH/w640-h360/2.png"/><figcaption>undefined</figcaption></figure><ol><li>For this project I am using an ESP32-C3 Super Mini single core microcontroller which has a small formfactor and also includes Wi-Fi and Bluetooth (Arduino Uno or similar microcontroller). https://s.click.aliexpress.com/e/_omnke4z</li><li>A HC-SR04 Ultrasonic Sensors (3-4 units) https://s.click.aliexpress.com/e/_ol2Np4t</li><li>A 24 LED NeoPixel Ring https://s.click.aliexpress.com/e/_onkX369</li><li>A TM1637 7-Segment display https://s.click.aliexpress.com/e/_o2Dm6fT</li><li>A Buzzer https://s.click.aliexpress.com/e/_olXJAb3</li><li>A 100 ohm Resistor https://s.click.aliexpress.com/e/_oCj0LAz</li><li>A mini AC-DC 5V Adapter https://s.click.aliexpress.com/e/_ooQJdvj</li><li>And mounting hardware printed using a 3D printer </li></ol><h3>Circuit Diagram</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDdLaxazuLOYvqBwlaYaiMKDYQJa7PUDcQgv9pHLD9IGYRy1MQPY6Pa5MZp56eE3T_tgcXTcIFRC0Cz9WSIuv93j3hLTeNuo-PU_vyFj48COT9gZERQiA0yrtLE4xI_h1IvZal4wsPPP5b0zU-8kDFXmFEDr_F3dRi3QnhW1adBQEVKsafsfn-1AnAmlZq/w640-h360/3.png"/><figcaption>undefined</figcaption></figure>The wiring setup is pretty straightforward:<ol><li> Connect the microcontroller's Pin 4 to the buzzer</li><li> Connect Pin 3 to the NeoPixel ring</li><li> Wire Pin 2 to the Trig pin and Pin 1 to the Echo pin of the ultrasonic sensor</li><li> Connect Pin 8 to CLK and Pin 9 to DIO of the TM1637 7-segment display</li><li> Finally, connect all the positive (+) terminals to the power rail and all negative (-) terminals to ground</li></ol><h3>Breadboard Testing</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEir7KlZvhfg_lEqo-T3PPPkkuOJTrhKwJ7crFcDNmMuhPfI81pflxC-8Jr6-lssx2slPhs9ICMwoFSX5mI9UMj2lNvWmzxpSygHWQwsPUXJxfSL9sRXg_OrMYhgYn3oxsHpQoiEo2fuDlaYo3e4974N0MUAME63_0d0gWze91ILP81iNoCVuzhrbwv4LfQN/w640-h360/4.png"/><figcaption>undefined</figcaption></figure>Board and Library-------------------For the project to function, we first need to install the "ESP32-C3" board from the board manager. Additionally, we need to install the "TM1637Display.h" and "Adafruit_NeoPixel.h" libraries via the library manager.I began by testing each component individually with the ESP32-C3 board to verify their functionality. Once all modules were confirmed to be working, I connected all of them to the ESP32 board and uploaded the program to orchestrate their combined operation. All source codes for this project are available on my GitHub repository.We'll begin the "Parking Assistant" code by importing all the required libraries. Then, in the variable declaration section, we will define all pin numbers and the initial sensor values, making them globally accessible.In the setup() section, the code first establishes a Wi-Fi connection to my Raspberry Pi-based home server. This feature is optional and can be disabled simply by removing or commenting out the relevant code section.Following the network initialization, all pin modes (INPUT/OUTPUT) are defined, and the necessary hardware modules are initialized.The loop() section operates continuously, performing two primary tasks: It reads the distance from the ultrasonic sensor and outputs the value to the 7-segment display. It also controls the NeoPixel LED color and number based on the measured distance, providing a visual indication of the approaching vehicle.The system detects when the vehicle is stationary by monitoring for a stable distance reading. Once parked, the NeoPixels enter a "rainbow" animation mode before both the 7-segment display and NeoPixels power down.<h3>The Board</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLoGwpo0tXIY8K1SXyj2aQ6JJ4Hy02L9t8BTqxJ0vX208BMilIHaupkLW6_NhC4K5bYPm9brRgZozIXAmpKhV9tYoONAa5vY_ZLmbrUZbVS_iYJwfk3oXC-S5KkAlCGRlOulecEeJYv5fOqesCraMB6OTMD78DrU95WbhhnUYE2dT-YFOUOeBu9mN2d9dx/w640-h360/10.png"/><figcaption>undefined</figcaption></figure>This is the 2D and 3D representation of my board. Initially, I designed it with just the circular PCB, but in the final iteration, I incorporated an additional PCB dedicated to the ultrasonic sensor.If you'd like to get started with PCB design, I have a step-by-step guide in "Tutorial No. 45: Transformers PCB BADGE", the link is in the description below.<h3>Soldering</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkpTGYEPI9n-q-IXlFj7gJCWOwJ3t-emJFW8JZ92TYskc7xzEc4Z_z7OkdwydyDFiIqxzQV5cGSY7i_HCmAse3c8EY3AQrRBq-pcZ6Csrf4HLMXLtg-ZDCKk_kd4N0kj8VTFiH0tpH47VPOsrd2wmZ-T-hI4pq5UYpK59jn_xZf0wGbi529-whJk8NnwqW/w640-h360/11.png"/><figcaption>undefined</figcaption></figure>Lets starts by soldering the resistance to the board. Then lets solder the ESP32-C3 microcontroller to the board. Since I care a lot about my ICs and micro-controllers, I never solder them directly to the board. In case of an ICs, I always try to use IC bases or if a base is not available I use female pin-headers. (This avoids direct soldering and allows for easy replacement).Then, let solder the buzzer followed by the AC-DC 5V Adapter to the board. Once thats done let solder the 7-Segment display to the board followed by the NeoPixel Ring. To maintain the height I added few supports to keep the ring affloat. The 220V power supply will be connected to these ports and the Ultrasonic sensor will connect to these ports via a 1M long cable.<figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbeY_MqNIgh6qLGMp7G2Jm0SMFYyp7p2hBEcrYJbPqwX9Hg44pO-k4zBZB3yDUDqFCGhU2tGru8cPgCjLt5g2RvkBGR5jZf4nCRMKU7Wg2M1IaGnK6JAfulpI7LsoH-Tmn5Nz8HB4gy2CASKg6vIJTSduy5g5hm0kcDC9E66KZPwO8GT0cvbXf6CHCrqfI/w640-h360/12.png"/><figcaption>undefined</figcaption></figure>Note: While a resistor isn't strictly required for WS2812 LEDs, it's often recommended to include one on the data line, especially for longer strips, to ensure reliable operation and protect the first LED from voltage spikes. A resistor between 220 ohms and 1k ohm is typically used.<h3>3D Printing</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPUN_aW65XwSan9bm2cLwY1RnKIdLej0wkVtT_BXpPnW6EyYTxEIm1jvkqKVt7uPwaml_2sEI-c2bbIoK7e8CU53r0GP05D9aKlroc3DnrB7UfSE0ij30ec3ySyHCyKbdmhGTi465gvv1F9RvwjROYnfGRtDokOjc0fC_zBQnIW_Eqwoo6KepSI9GneKBW/w640-h360/13.png"/><figcaption>undefined</figcaption></figure>I created the 3D model for this project using Microsoft 3D Builder. The top section is made up of four key components:<ol><li> Main Housing – The primary enclosure for the unit.</li><li> Front Covers – Protective panels for the front section.</li><li> Internal Holder – A custom piece to secure the unit inside the housing.</li><li> Back Lid – The rear cover that completes the assembly.</li></ol>For the bottom section housing the ultrasonic sensor, I used a 3D model originally created by dstark1 from Thingiverse, which I modified to fit into my project.The 3D printed cover acts as a light-diffusing cover for the NeoPixel ring. Its semi-translucent material softens the bright LEDs, preventing eye strain and protecting the components.Once all the 3D models were sorted, I went ahead and printed them using my 3D printer.<h3>Assembly</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKPUIJicMTuUcuRPNWhvzoM0NE0vAxigcMceXDkYpmrqIpVNalEzYNVWIcX-BppwNRZ4lf-JFUHv7l6gE64tMU2f-7MSTqrG-AIr90m9grUzddwNg2RMJHsYjUdA35Y_4WC8N5lHcx2kF6wyd0zA0k3JHvrFk3KjrndVrRKwH-xR65KrI8isKA0LhtAfVl/w640-h360/15.png"/><figcaption>undefined</figcaption></figure>To complete the setup, assemble the 3D-printed enclosure and insert the electronics into it. Mount the ultrasonic sensor on the garage wall at bumper height for accurate detection, and install the LED strip where it is clearly visible to the driver. Calibrate the system by testing with objects at known distances and adjust the SAFE_DISTANCE, WARNING_DISTANCE, and DANGER_DISTANCE values in the code accordingly. Finally, fine-tune the buzzer’s frequency and duration for optimal alerts.<h3>Demo</h3><figure><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDMqxn4M1bZm6yBHGkFQ5PLcrj6Bjypjy1kNPshTkxW74ScGFbXpXaXQ-MgvvCTqrPIx4YML9zBitmP0uR3nq9S5HEIJpZzDcsBfTKSXvwu-pxk5lVSkZyFaUFh9lfihkOmN33J9bHb8vXlo1qJ-53mbSnDLJWn9Ku3lFiwK3yApsLxZDY5LC_L0hE7Axx/w640-h360/16.png"/><figcaption>undefined</figcaption></figure>When the unit boots up, the LEDs flash in rainbow colors and then switch to displaying a color based on the proximity. The distance is also shown on the 7-segment display. If no movement is detected, the LEDs and the 7-segment display turn off.Beyond standard proximity detection, this version also includes Wi-Fi/Bluetooth connectivity, allowing smartphone integration to monitor distance data via Google Charts.Let me know what you think. Feel free to like, share, and comment if you have any suggestions for improvement!Key FeaturesProgressive visual feedback - LED color changes from green to red as distance decreasesAudible alerts - Beeping frequency increases as vehicle approaches obstaclesWeather-resistant - design for outdoor useHC-SR04 Ultrasonic Sensor:Maximum Range - 4 metersMinimum Range - 2 cm<h3>Thanks</h3><figure><iframe src="https://www.youtube.com/watch?v=rqTDj7GabGw"></iframe></figure>Thanks again for checking my post. I hope it helps you.If you want to support me subscribe to my YouTube Channel: https://www.youtube.com/@CrazyCoupleDIY	Video: https://youtu.be/rqTDj7GabGw	Full Blog Post: https://diyfactory007.blogspot.com/2025/08/arduino-parking-assistant-v3.html	Github: https://github.com/tarantula3/Arduino-Parking-Assistant-V3	Gerber: https://www.pcbway.com/project/shareproject/Arduino_Parking_Assistant_V3_730ffc85.html References Arduino based parking assistant V1: https://youtu.be/LQGhprwuHe0 Arduino based parking assistant V2: https://youtu.be/MqJxUf3Cugg All About TM1637: https://youtu.be/Ob9mrq_Lj9k Transformers PCB BADGE: https://youtu.be/vlJoQAzjYDo Support My Work BTC: 1Hrr83W2zu2hmDcmYqZMhgPQ71oLj5b7v5 LTC: LPh69qxUqaHKYuFPJVJsNQjpBHWK7hZ9TZ DOGE: DEU2Wz3TK95119HMNZv2kpU7PkWbGNs9K3 ETH: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4 BAT: 0x9D9E77cA360b53cD89cc01dC37A5314C0113FFc3 LBC: bZ8ANEJFsd2MNFfpoxBhtFNPboh7PmD7M2 COS: bnb136ns6lfw4zs5hg4n85vdthaad7hq5m4gtkgf23 Memo: 572187879 BNB: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4 MATIC: 0xD64fb51C74E0206cB6702aB922C765c68B97dCD4Thanks, ca again in my next tutorial.</body></html>