Smart Speed Tracker
Dual HC-SR04 ultrasonic sensors (adjustable gap) on Arduino
Uno detect vehicles via time-of-flight. Real-time km/h
output via Serial to Python GUI for moving average
filtering, speed violation alerts, and data logging.
Hardware:Arduino Uno (pins 9-12)
2x HC-SR04 ultrasonic sensors (2-400cm range)
5V relay module (speed violation trigger)
12V LED chain (visual alert)
Breadboard + jumper wires
Firmware (Arduino C++):
// Key features
- Dual sensor state machine
- 10ms loop (100Hz sampling)
- Speed = 10cm ÷ time × 0.036 (km/h)
Python Application:
- Serial reader (pyserial)
- Moving average filter (numpy)
- Real-time speed GUI (matplotlib/tkinter)
- CSV logging
- Speed limit violation detection
End-to-End Flow:
Sensors → Arduino (km/h) → Serial → Python GUI → Alerts/Logging
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