Bluedio T4 VS T3 Active Noise Cancelling Wireless Bluetooth Headphones REVIEW
Bluetooth module HC-05 is used to establish a wireless connection between android phone and Arduino.
Load the source code into the Arduino before making the circuit.
IMPORTNT – Remove the Rx and Tx connections everytime when uploading the source code.
Source code is in the comment. (Watch other video if you don’t know how to upload the source code).