esp32-audioplayer

ESP32 based MP3 audio player with RFID control and case made from laser cutted plywood

!!! WORK IN PROGRESS !!! !!! not functional yet !!!

Used electronic hardware components:

• ESP32 NodeMCU module
• RFID-RC522 module (i.e. https://www.ebay.de/itm/172603664748)
• VS1053B module with SD-slot (i.e. http://www.ebay.de/itm/272761135002)
• Mifare classic 13.56MHz RFID cards (clones will do the job too, i.e. http://www.ebay.de/itm/122525501095)
• Adafruit PowerBoost 500 Charger module
• 3.7V LiPo battery
• Class-D amplifier module
• SD-Card (i.e. 4GB)
• two Visaton FR7 (4 ohms) speakers
• Custom main board (see kicad folder for layout)
• Custom panel board (see kicad folder for layout)
• 1x 220uF 35V
• 1x 1uF 63V
• 4x 100nF
• 2x 47nF
• 1x resistor ladder 4x 4.7k
• 1x 10R
• 1x 10kR
• 1x 22kR
• 4x WSL10 (2x5 header 2.54mm with notch)
• 2x 2-pin header 2.54mm
• 4x 4-pin header 2.54mm
• some wire for airwires
• some insulated wire 1mm², red and black (for internal connections)
• 1x USB 2 Micro-B connector
• 1x power switch
• 1x USB 2 micro cable (for internal connection)
• optional: MEMS gyroscope module
• optional: 0.96 inch I2C OLED display

Wood parts:

• 6 sheets, one for every side of the case
• 2 distance rings for the speakers

Metal parts:

• 2x 100x75x0.8mm aluminium sheet

3D-Printed parts:

• 8x inner edge reinforcements
• 4x M3x3 standoff
• 8x M3*8 standoff (for main board)
• 4x M3x11 standoff (for MP3 board)
• 2x M3x6 standoff (for panel board)
• 2x M3x4 standoff (for panel board)
• 1x USB receptacle holder
• 1x SD-Card slot box
• 1x SD-Card slot cover

Screws

• 4x M3x25 DIN 7991/ISO 10642 (countersunk allen bolt)
• 32x M3 DIN 934/ISO 4042 (nut)
• 8x M3 DIN 125/ISO 7089 (washer)
• 8x M3x20 DIN 912/ISO 4762 (cylinder head allen bolt)
• 2x M2x10 DIN 912/ISO 4762 (cylinder head allen bolt) for amp
• 2x M2 DIN 934/ISO 4042 (nut)
• 2x M2 DIN 125/ISO 7089 (washer)
• 8x M3x?? DIN 7991/ISO 10642 (countersunk allen bolt) for speakers
• 24x M3x15 DIN 7991/ISO 10642 (countersunk allen bolt) for inner corners

Used software:

• VSCode with PlatformioIDE

Used Arduino Libraries:

• SdFat 1.0.7
• MFRC522 1.3.6

Port mapping

see src/config.h

3D printing

I used black 1.75 PETG filament for all parts. Layer height was 0.15mm at a printign speed of 30mm/s.