@ -14,7 +14,7 @@ Moved to [another location](changelog.md) as it became to prominent here. Only l
## ESPuino - what's that?
The basic idea of ESPuino is to provide a way, to use the Arduino-platform for a music-control-concept that supports locally stored music-files without DRM-restrictions. This basically means that RFID-tags are used to direct a music-player. Even for kids this concept is simple: place an RFID-object (card, character) on top of a box and the music starts to play. Place another RFID-object on it and anything else is played. Simple as that.
The core of my implementation is based on the popular [ESP32 by Espressif](https://www.espressif.com/en/prodts/hardware/esp32/overview). Having WiFi-support out-of-the-box makes it possible to provide further features like an integrated FTP-server (to feed the player with music), smarthome-integration via MQTT, webradio and administration via webgui. And nonetheless Bluetooth, too! However, my primary focus was to port the project to a modular base. Having said this mp3-decoding is done in software with a dedicated µSD-card-slot and music-output is done via I2S-protocol. I did all my tests on [Adafruit's MAX98357A](https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/pinouts), [UDA1334](https://www.adafruit.com/product/3678) and [headphone-pcb](https://github.com/biologist79/ESPuino/tree/master/PCBs/Headphone%20with%20PCM5102a%20and%20TDA1308). Hopefully, not only in theory, other DACs that support I2S can be used as well.
The core of my implementation is based on the popular [ESP32 by Espressif](https://www.espressif.com/en/products/hardware/esp32/overview). Having WiFi-support out-of-the-box makes it possible to provide further features like an integrated FTP-server (to feed the player with music), smarthome-integration via MQTT, webradio and administration via webgui. And nonetheless Bluetooth, too! However, my primary focus was to port the project to a modular base. Having said this mp3-decoding is done in software with a dedicated µSD-card-slot and music-output is done via I2S-protocol. I did all my tests on [Adafruit's MAX98357A](https://learn.adafruit.com/adafruit-max98357-i2s-class-d-mono-amp/pinouts), [UDA1334](https://www.adafruit.com/product/3678) and [headphone-pcb](https://github.com/biologist79/ESPuino/tree/master/PCBs/Headphone%20with%20PCM5102a%20and%20TDA1308). Hopefully, not only in theory, other DACs that support I2S can be used as well.
## Hardware-setup
The heart of my project is an ESP32 on a [Wemos Lolin32 development-board](https://www.ebay.de/itm/4MB-Flash-WEMOS-Lolin32-V1-0-0-WIFI-Bluetooth-Card-Based-ESP-32-ESP-WROOM-32/162716855489). If ordered in China (Aliexpress, eBay e.g.) it's pretty cheap (around 4€) but even in Europe it's only around 8€. Make sure to install the drivers for the USB/Serial-chip (CP2102 e.g.). But probably it's better to use it's successor (which has battery-measurement already included): [Wemos Lolin D32](https://de.aliexpress.com/item/32808551116.html). Or, if you're planning to enjoy webstreams regularly, [Wemos Lolin D32 pro](https://de.aliexpress.com/item/32883116057.html) might be a good decision. It comes with µSD-slot onboard and because of its ESP32-WROVER-B, it has PSRAM included. PSRAM is used as webstream-cache and might be used more intensively in future by ESPuino in general.
Robin Bertram
4 years ago