Bluetooth Receiver with EQ

Hardware Requirements:

• Original ESP32/WROOM-32 with Bluetooth Classic
• PCM5102A DAC
• Arduino IDE

What we are building:

• Bluetooth A2DP receiver
• Stereo bass, mid and treble EQ
• Flat, Rock, Jazz and Classical presets
• Serial control for initial tuning

It uses the current ESP32-A2DP and Arduino Audio Tools approach. ESP32-A2DP receives SBC audio as 16-bit stereo PCM, and Audio Tools provides the I²S output layer.

Install these libraries

In Arduino IDE → Library Manager, install:

• ESP32-A2DP by Phil Schatzmann
• Arduino Audio Tools by Phil Schatzmann

Select an original ESP32 board, such as ESP32 Dev Module. The ESP32-S3 and C3 are unsuitable because they do not support Bluetooth Classic A2DP.

Pinout

If exposed:

• FMT → GND for standard I²S
• XSMT → 3.3 V for unmuted operation
• SCK → GND on the common PLL-equipped modules

These pin assignments correspond to the established ESP32-A2DP PCM5102 setup.