esp32_fmdevkit
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dragon-engineer
ESP32 Development Board for FM broadcasting. Complete DA Audio processing. The example/default Arduino firmware works as a Bluetooth Speaker (A2DP Sink). The code builds with the newest ESP32 Arduino...
ESP32 FM DevKit (esp32_fmdevkit)
ESP32-based development board
Features
- USB to UART bridge with auto boot mode / reset
- Blue OLED 128x64 (top 16pixels yellow for a status bar)
- 24-bit Stereo I2S DAC
- Single-chip FM transmitter with RDS support
- 3.5mm Headphone Jack output
- 4 User buttons
- 1 Status LED (Red) and 1 User LED (Blue)
- RF SMA Output
- Expansion Pin Headers
Note: The ESP32 FM DevKit is available in two variants: Standard is based on ESP32 with on-board PCB antenna trace and Extended is based on ESP32 with external IPEX antenna connector (antenna not included)
The FM transmitter works in full range, i.e. 76 - 108 MHz. Check your local FM frequencies first.
Build your own FM Radio station based on this kit! Use WiFi or Bluetooth as an audio source (default ESP32 example firmware uses Bluetooth A2DP sink).
First steps
- Connect USB to a computer/power bank
- Pair your laptop/phone with "ESP32-FM_DevKit"
- Play some music
- Tune the TX Frequency by UP/DOWN and confirm with OK button
- Tune your FM Radio receiver to this frequency
- Download the example code from here and do your own stuff
Pinout Information:
| Board Label | Arduino Pin Definition | ESP32 Pin Number | Description |
|---|---|---|---|
| D0 | D0 | 34 | GPI Pin (Input Only) |
| D1 | D1 | 35 | GPI Pin (Input Only) |
| D2 | D2 | 32 | GPO Pin (Output Only) |
| D3 | D3 | 33 | GPO Pin (Output Only) |
| D4 | D4 | 27 | GPIO Pin |
| D5 | D5 | 14 | GPIO Pin |
| D6 | D6 | 12 | GPIO Pin |
| D7 | D7 | 13 | GPIO Pin |
| D8 | D8 | 15 | GPIO Pin |
| D9 | D9 | 23 | GPIO Pin |
| D10 | D10 | 0 | GPIO Pin |
| SW1 | SW1 | 4 | Button Switch 1 (ESC) Input |
| SW2 | SW2 | 18 | Button Switch 2 (OK) Input |
| SW3 | SW3 | 19 | Button Switch 3 (Down) Input |
| SW4 | SW4 | 21 | Button Switch 4 (Up) Input |
| TX | TX | 1 | UART TX (Connected to USB-UART bridge) |
| RX | RX | 3 | UART RX (Connected to USB-UART bridge) |
| SCL | SCL | 17 | I2C SCL (2k2 pull-up), OLED and FM TX present |
| SDA | SDA | 16 | I2C SDA (2k2 pull-up), OLED and FM TX present |
| LED2 | LED_BUILTIN | 5 | Blue built-in LED |
| I2SL | I2S_LRCLK | 25 | I2S Left/Right CLK |
| I2SB | I2S_SCLK | 26 | I2S Clock (Sampling Frequency) |
| I2SD | I2S_DOUT | 22 | I2S Data Out |
| 5V | - | - | USB Vcc |
| 3V3 | - | - | LDO Regulator Output (500mA total) |
Note that this is just a pre-release of an unofficial ESP32 development board mostly distributed on Ebay. You can however contact the Dev team at this E-Mail if you are interested in this board distribution.
Metadata
Owner
dragon-engineer
Metadata
ESP32 Development Board for FM broadcasting. Complete DA Audio processing. The example/default Arduino firmware works as a Bluetooth Speaker (A2DP Sink). The code builds with the newest ESP32 Arduino...