When your Bluetooth speaker blasts out its final observe and fades into silence, you don’t must order a brand new one and wait days for it to reach. As a substitute, you’ll be able to construct your personal with only a few fundamental parts that the majority electronics hobbyists have already got of their spare components bin. Merely join a handful of wires, flash the firmware, and also you’ll be listening to your favourite tunes once more in a matter of minutes.
YouTuber Volos Tasks lately demonstrated a simple strategy to make a DIY Bluetooth speaker. First, you’ll want a LILYGO T-Show board, which makes use of an older ESP32 chip. This element is extra vital than it might sound — not like newer variants such because the ESP32-S3, this chip helps Bluetooth Traditional, which is required for dealing with high-quality audio streaming by way of the A2DP protocol. Paired with the microcontroller is a MAX98357A module, a compact I2S digital-to-analog converter with a built-in 3-watt Class D amplifier, able to driving a small speaker immediately.
The T-Show board (📷: LILYGO)
The ESP32 communicates with the audio module over an I2S interface, sending a digital audio stream that the DAC converts and amplifies for playback. A easy speaker connects on to the module’s output, whereas a jumper wire tweak ties the acquire pin to floor, boosting the amplifier’s output for elevated quantity.
On the software program facet, the construct depends on a specialised Bluetooth audio library, which simplifies the in any other case complicated process of implementing A2DP streaming. One vital element is the necessity to use an older ESP32 board definition — model 2.0.7 — inside the Arduino IDE, as newer releases can break compatibility with Bluetooth Traditional options.
This construct is greater than only a fundamental audio receiver, due to its built-in show. Utilizing the TFT_eSPI library, the small onboard display screen exhibits connection standing, playback exercise, and the title of the presently enjoying monitor. This provides a refined, consumer-grade really feel to an in any other case minimalist DIY construct.
If you happen to’ve obtained half-hour or so and some spare components, you’ll be able to construct your personal Bluetooth speaker. Try the video beneath for all the small print you want.