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IoThings Sound System

ToDo list

HW

  • Find a suitable DAC
  • Find a suitable amplifier
  • Connect a Rotary Encoder with Push-Button
  • Rotary potentiometer (generic)

SW

  • JSON configuration (last volume, station, source)
  • SI4703
  • TEA5767

Functionnal

  • Connect the Antenna button
  • Connect the Volume button
  • Connect the High frequencies
  • Connect the Low frequencies
  • Connect the switches (On/Off, PU, GO, PO, OC, MF)

Resources

Radio Arduino Library

Notes

DevKitC6: UART left (SLABtoUART) CopyS3: USB Left or COM right (WCH USB Serial ?)

esp-idf-tea5767

TEA5767 FM Stereo Radio Driver for esp-idf.

I ported from here.

Software requirements

ESP-IDF V4.4/V5.x.
ESP-IDF V5.0 is required when using ESP32-C2.
ESP-IDF V5.1 is required when using ESP32-C6.

Hardware requirements

TEA5767 FM Stereo Radio Module.
I bought this on AliExpress about $4.

tea5767-1 tea5767-2

The module has a standard antenna, but if you want to use it in a room, you need a long antenna.
With a long antenna, you can get more signals.
I used an AC power cable as extended antena.
tea5767-3

Installation

git clone https://github.com/nopnop2002/esp-idf-tea5767
cd esp-idf-tea5767
idf.py set-target {esp32/esp32s2/esp32s3/esp32c2/esp32c3/esp32c6}
idf.py menuconfig
idf.py flash

Configuration

config-top config-tea5767

  • CONFIG_SCL_GPIO
    GPIO number(IOxx) to SCL.
  • CONFIG_SDA_GPIO
    GPIO number(IOxx) to SDA.
  • CONFIG_FM_BAND
    In US/EU it ranges from 87.5 MHz to 108 MHz.
    In Japan it ranges from 76 MHz to 91 MHz.
    Used when wrapping in a search.

Wiring

TEA5767 ESP32 ESP32-S2/S3 ESP32-C2/C3/C6
SCL -- GPIO22 GPIO4 GPIO6 (*1)
SDA -- GPIO21 GPIO3 GPIO5 (*1)
GND -- GND GND GND
VCC -- 3.3V 3.3V 3.3V (*2)

(*1)
You can change it to any pin using menuconfig.
But it may not work with other GPIOs.

(*2)
The PCB marking is +5V, but it works at 3.3V.

API

Refer to tea5767.h.

How to use

  • Search radio station
    Press the + key to search for radio stations upwards.
    Press the - key to search for radio stations downwards.

  • Preset radio station
    Press the * key to record the current radio station in NVS.
    At boot time, it read from NVS and set to the current Radio station.

  • Change frequence
    Press the D key to decrease the frequence by -1.0Mhz.
    Press the U key to increase the frequence by +1.0Mhz.
    Press the d key to decrease the frequence by -0.1Mhz.
    Press the u key to increase the frequence by +0.1Mhz.

  • Clear preset
    idf.py erase-flash

Reference

https://github.com/nopnop2002/esp-idf-fm-radio

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