HardLabs

Echowawa

moonbeeper·echowawa·PCB/echowawa.kicad_pcb

Echowawa PCB layout, top view — open source ESP32 board by moonbeeper
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About the Echowawa PCB

Echowawa is an open source ESP32 PCB design by moonbeeper, published on GitHub. It is a 4-layer board measuring 80 × 40 mm, with 96 components from 38 distinct parts.

Its main chip is the ESP32-WROOM-32E-R2, from the ESP32 family. Other key parts include the TLP185XSE, XC6220B331MR, ADUM3160, F0505S-3WR2 and PCM5100A. By type, the board carries 50 capacitors, 23 resistors, 10 ICs, 5 connectors, 3 diodes and 2 transformers.

It belongs with the audio and iot & wireless designs in this gallery.

From the project

Your typical DAC with bluetooth audio (with possible upgrades to use WiFi sources) and a USB C as an AUX port. It can output to either RCA jacks or a headphone jack. It also features a pretty fancy oled screen with its cool menu navigated via the knob.

Your typical DAC with bluetooth audio (with possible upgrades to use WiFi sources) and a USB C as an AUX port. It can output to either RCA jacks or a headphone jack. It also features a pretty fancy oled screen with its cool menu navigated via the knob.

The reason I made this was because of the fact that I am no longer a fan of using cheap bluetooth magic boxes with bad audio output when I can make my own magic box with probably better audio quality and a better design.

Echowawa, from the project README
From the project README

Main components on the Echowawa

ESP32-WROOM-32E-R2TLP185XSEXC6220B331MRADUM3160F0505S-3WR2PCM5100APCM2912APJTRTS5A22364DGSR

Echowawa bill of materials (BOM)

96 components, 38 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-WROOM-32E-R2
U1
1
TLP185XSE
TLP185xSE
U2
2
XC6220B331MR
U3, U6
1
ADUM3160
U4
1
F0505S-3WR2
U5
1
PCM5100A
U7
1
PCM2912APJTR
U8
2
TS5A22364DGSR
U9, U10
1
6MHZ
6MHz
Y1
1
USB_C_RECEPTACLE_POWERONLY_6P
USB_C_Receptacle_PowerOnly_6P
J3
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J4
1
AUDIOJACK3
AudioJack3
J5
2
C18080
Conn_Coaxial
J6, J7
1
C202365
RotaryEncoder_Switch
SW1
2
C596483
Transformer_Audio
T1, T2
2
WS2812B-2020
D1, D2
1
LED
D3
1
6.8UH
6.8uH
L1
26
1UF
1uF
C1, C2, C3, C4, C5, C6, C7, C8 +18
2
4.7UF
4.7uF
C12, C14
Show 18 more
QtyPartRefs
4
10UF
10uF
C21, C29, C32, C39
2
27PF
27pF
C22, C23
5
100NF
100nF
C24, C25, C27, C35, C38
2
2.2UF
2.2uF
C30, C33
2
100PF
100pF
C31, C34
1
3.3UF
3.3uF
C36
4
2.2NF
2.2nF
C41, C42, C45, C46
2
100UF
100uF
C47, C48
3
4.7K
4.7k
R1, R2, R4
3
470
R3, R18, R19
4
5.1K
R5, R7, R9, R10
4
24K
24k
R6, R8, R11, R12
1
0
R13
1
10K
10k
R14
1
1.5K
1.5k
R15
1
1M
R16
1
100
R17
4
3.3K
R20, R21, R22, R23

Echowawa design files

The KiCad project lives in the moonbeeper/echowawa repository on GitHub; these links point at the commit this page was built from.

Echowawa: common questions

What microcontroller does the Echowawa use?

The Echowawa is built around the ESP32-WROOM-32E-R2, from the ESP32 family.

How big is the Echowawa PCB?

The Echowawa measures 80 × 40 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Echowawa?

96 components, from 38 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Echowawa design files?

From the moonbeeper/echowawa repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Echowawa design in my own project?

The repository has no license, so all rights stay with moonbeeper. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Echowawa without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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