Raspberry Pi Bluetooth Speaker: Play Audio Wirelessly using Raspberry Pi

This project transforms a standard wired setup into a wireless audio system by leveraging the computing and networking capabilities of a Raspberry Pi 5. At the core of the system is the Raspberry Pi running Raspbian Stretch, which serves as the central processing unit and host. Using the BlueZ Bluetooth protocol stack and PulseAudio sound server, the Raspberry Pi discovers, pairs, and connects with external audio-emitting devices like smartphones or laptops. When audio data is streamed via Bluetooth, the Raspberry Pi receives the digital packets and routes them through PulseAudio. Because standard speakers require an analog signal, the Raspberry Pi utilizes its internal audio architecture to output sound through its physical audio interface, which connects directly to the speakers using a 3.5mm jack. A dedicated power supply provides stable electrical energy to the Raspberry Pi to ensure continuous operation during streaming. Additionally, a push button wired to the GPIO pins can be programmed via Python 3 and the RPi.GPIO library to execute custom functions, such as toggling pairing modes or pausing audio playback. A MicroSD card acts as the primary boot and storage medium, holding the operating system, configuration files, and software packages required to manage the Bluetooth connection and audio pipeline.