This project is a Bluetooth speaker built with an ESP32 microcontroller. You pair it to your phone just like a normal Bluetooth speaker, and it plays music through a small speaker using an audio amplifier. It has a TFT screen that shows the current content title, artist/channel, and volume level, with a scrolling effect for long titles. It also has three physical buttons so you can pause or skip tracks without touching your phone, plus a potentiometer to control the volume. This is only tested on Iphone so i cant guarantee it will work with every device.
See the speaker working: Watch the YouTube Demo
- ESP32 DevKit V1
- MAX98357A Amplifier Module
- 1.8" TFT SPI Display (ST7735)
- 10k Potentiometer
- 3x Push Buttons
- 3W 8Ω Mini Speaker
- Blue LED (with Resistor)
- Jumper Wires
| Component / Pin | Power Source | Notes |
|---|---|---|
| Potentiometer VCC | 3.3V |
Use 3.3V to ensure the analog signal doesnt exceed the ESP32s 3.3V ADC limit. |
| TFT Display VCC | 3.3V |
Primary power for the display logic. |
| TFT Display LED (BL) | 3.3V |
Backlight power for the display. |
| MAX98357A VCC/VIN | 5V |
Needs 5V for optimal speaker amplification. |
| Blue LED (Anode) | 3.3V |
Power via ESP pin. Use a current-limiting resistor. |
| All Ground Connections | GND |
Tie all component GNDs to the ESP32 GND. |
| TFT Pin | ESP32 GPIO | Description |
|---|---|---|
| CS | GPIO 5 |
Chip Select |
| DC (A0) | GPIO 2 |
Data/Command |
| RST | GPIO 4 |
Reset |
| SCK | GPIO 18 |
Hardware VSPI Clock |
| SDA (MOSI) | GPIO 23 |
Hardware VSPI Data |
| MAX98357A Pin | ESP32 GPIO | Description |
|---|---|---|
| LRC | GPIO 26 |
Left/Right Word Select framing Clock |
| BCLK | GPIO 27 |
Bit Clock |
| DIN | GPIO 14 |
Digital Audio Data In |
| Speaker + / - | N/A | Connect directly to the speaker |
| Component | ESP32 GPIO | Description |
|---|---|---|
| Button: Next | GPIO 25 |
Connect the other side of the button to GND (Uses internal pull-up) |
| Button: Previous | GPIO 32 |
Connect the other side of the button to GND (Uses internal pull-up) |
| Button: Play/Pause | GPIO 33 |
Connect the other side of the button to GND (Uses internal pull-up) |
| Potentiometer | GPIO 34 |
Center pin of the pot (ADC input for volume reading) |
| Blue Status LED | GPIO 13 |
Controls connection status blinking |
To compile this project, the following libraries are required via PlatformIO:
- ESP32-A2DP by pschatzmann (A2DP Sink and AVRCP Metadata)
- arduino-audio-tools by pschatzmann (Audio streaming framework)
- Adafruit ST7735 and ST7789 Library (Display Driver)
- Adafruit GFX Library (Graphics rendering and layout)