Ultrasonic Distance Measurement with Bluetooth Communication

This project builds a wireless distance measurement system using an HC-SR04 ultrasonic sensor and an HC-05 Bluetooth module. The HC-SR04 sensor emits ultrasonic waves and detects their reflection from objects to determine the distance between the sensor and the object. The HC-05 module allows the measured distance data to be transmitted wirelessly to a smartphone or other Bluetooth-enabled device.

 how it works:

1. The Arduino controls the HC-SR04 sensor, triggering it to emit ultrasonic pulses.
2. The sensor detects the reflected sound waves and calculates the distance based on the time it takes for the sound to travel.
3. The Arduino then transmits the measured distance data to the connected HC-05 Bluetooth module.
4. The HC-05 module acts as a bridge.