ESP32 Parking Sensor (HC-SR04 + 5-LED Bar + Buzzer + OLED)

The ESP32 version of the car parking sensor! We use the HC-SR04 ultrasonic sensor to measure the distance to the object in front of it. As the distance decreases, the 5-LED bar fills up (green → yellow → red) and the buzzer beep interval shortens. When the object gets very close (under 10 cm), a continuous alarm sounds and all LEDs light up. The SSD1306 OLED display shows the current distance in cm in large font, a status message (STOP / CAUTION / CLOSE / STOP! / DANGER), and a simulation of the