DIY MP3 player for kids.
- Press "eye" button: Increase/decrease volume
- Press and hole "eye": rewind / fast forward (the longer you hole, the more you rewind / fast forward)
- Press both "eyes": Start MP3 from beginning
- If no MP3 is found for RFID Tag, a empty file is added to the SD card to help you with the naming.
- If you forget to turn off, a sound will appear from time to time.
I combine multiple MP3s into one MP3 using:
audio-join() ffmpeg -i "concat:${(j:|:)@[2,-1]}" -acodec copy $1
audio-join output.mp3 *.mp3I pre-process all my MP3s using:
ffmpeg -i 8853ade395.mp3 -acodec libmp3lame -ac 2 -ab 128k -ar 44100 8853ade395_.mp3| Part | ~Price | Sample Supplier |
|---|---|---|
| 1 x ESP32 LyraT V4.3 | 18,00€ | mouser |
| 1 x LiPo Akku 3,7V 2500mAh (JST-PHR-2 Connector) | 8,94€ | Eckstein |
| 1 x JST-PH 2,0mm (20 Paare) 2 Pin | 4,19€ | Eckstein |
| 2 x Lautsprecher 4 Ohms, 3 W | 8,14€ | mouser |
| 1 x MicroSD Card 16 GB | 12,19€ | mouser oder mouser |
| 2 x Pushbutton switch Off (On) | 11,60€ | mouser |
| 1 x male-female jumper wires (10 pieces) | 4,43€ | mouser |
| 1 x On/Off switch | ||
| 1 x Fuse | ||
| 1 x Fuse holder | ||
| 1 x RFID/NFC reader RC522 I2C v1.1 | 6,08€ | AliExpress |
| 1 x RFID/NFC Tags (10 pieces) | 4,95€ | ebay |
You likely find better prices. I tried to keep the number of suppliers low.
TODO add fuse details
WARNING The polarity of the battery connector does not match the polarity on the board! I had to pull out the socket on the board and turn it 180°.
I'm not sure if the fuse is needed and properly sized. It feels better to have one :)
TODO add pictures
Wood thickness: 10mm
- A: 116mm x 116mm
- B: 116mm x 116mm
- C: 116mm x 96mm
- D: 96mm x 96mm
- E: 116m x 96mm
- F: 96m x 96mm
TODO add pictures
- https://docs.espressif.com/projects/esp-adf/en/latest/get-started/get-started-esp32-lyrat.html
- https://docs.espressif.com/projects/esp-adf/en/latest/design-guide/board-esp32-lyrat-v4.3.html
Requires Python 2.7 (we use https://github.com/pyenv/pyenv) Requires ESP ADF v2.0
/bin/bash
export ADF_PATH=$HOME/esp/esp-adf
. $HOME/esp/esp-idf/export.sh
Press and hold button, press button and release button.
make flash monitor -j5
press to start application
The following command might help:
make erase_flash
Inside ~/esp/esp-adf:
git fetch
git checkout v2.5
git submodule update --init --recursive