This project is a high-precision digital parking sensor system implemented on the Digilent Basys 3 FPGA using VHDL. It utilizes an HC-SR04 ultrasonic sensor to measure distance and provides real-time feedback through visual indicators (LCD & 7-Segment Display) and auditory warnings (Buzzer).
The system is designed to assist drivers in tight spaces by calculating distance with 0.01 cm precision and switching between safety modes automatically.
Check out the system in action:
The system measures the time of flight for the ultrasonic pulse.
- Physics: Sound travels 1 cm in approx. 58 µs.
- Logic: The VHDL counter increments every 58 clock cycles (at 100 MHz).
- Result: This allows for a precise measurement resolution of 0.1 mm without complex floating-point arithmetic.
The system uses a Moore FSM to control warnings based on distance:
| Zone State | Distance Range | LED Output | Buzzer Output |
|---|---|---|---|
| SAFE | > 10 cm | 🟢 Green (Solid) | 🔇 Silent |
| WARNING | 5 cm - 10 cm | 🟡 Yellow (1Hz Blink) | 🔉 Low Beep |
| DANGER | 0 cm - 5 cm | 🔴 Red (4Hz Blink) | 🔊 High Alarm |
A single push-button cycles through 4 operational modes to manage power:
- Mode 1 (Full Active): All displays and sensors ON.
- Mode 2 (LCD Only): 7-Segment OFF (Power Save).
- Mode 3 (7-Seg Only): LCD Screen OFF.
- Mode 4 (Standby): System completely OFF.
| Component | Port | Description |
|---|---|---|
| Ultrasonic Trig | JA[0] | Output pulse to sensor |
| Ultrasonic Echo | JA[1] | Input pulse from sensor |
| Buzzer | JA[2] | PWM Audio Output |
| LCD Screen | JB[0-7] | 4-bit Parallel Interface |
| Status LEDs | LED[13-15] | RGB Warning Indicators |
(See constraints/Basys3_Master.xdc for full pinout)
This project was developed for the EE2003 Digital Design course at Marmara University.
- Canberk Suner (Architecture & VHDL)
- Ömer Faruk Kocaoğlu (Simulation)
- Resul Argın (Hardware Integration)
- Yusuf Polat (Documentation & Presentation)
For detailed circuit diagrams, simulation waveforms, and the full project report, please view the PDF below: 📥 Download Project Report (PDF)
License: MIT | Created by Ömer Faruk Kocaoğlu & Team