HardLabs

Hand main

SonDinh23·EMGBand-HandBionic·hardware/Hand_main/Hand_main.kicad_pcb

Hand main PCB layout, top view — open source ESP32 board by SonDinh23
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About the Hand main PCB

Hand main is an open source ESP32 PCB design by SonDinh23, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 70 × 45 mm, with 105 components from 43 distinct parts.

Its main chip is the ESP32-WROOM-32D-N4, from the ESP32 family. Other key parts include the Pad 3, CP2102N-Axx-xQFN28, INA3221, TPS54620RGYR and XC6220B331MR. By type, the board carries 44 resistors, 38 capacitors, 12 ICs, 5 diodes, 2 transistors and 1 connector.

It belongs with the iot & wireless, wearables and robotics & motion designs in this gallery.

From the project

Full-stack 6-ch dry-electrode sEMG wearable (ESP32/BLE, 1 kHz/ch, JSON presets) with DC removal + HPF/LPF + Kalman DSP and dual-path gesture control (Amplitude thresholds + 6-ch Radar-shape matching) + Flutter app; SNR>=8 dB, latency<=80-100 ms, >=85% online (4 grips)

The definitive pit stop for every PCB in the EMGBand/Hand Bionic stack. Each section tells you what the board does, how it talks to the rest, where to grab build assets, and what to check before you power it up—plus a gallery pulled straight from the committed files.

- Use forward slashes / in image paths; links are relative to this README. - Example: ``. - GitHub renders images once the PNG files are present; add new renders/photos in the matching board folder. - Prefer per-board READMEs or a PDF gallery? Say the word and we will scaffold it.

Hand main, from the project README
From the project README

Main components on the Hand main

Pad 3CP2102N-Axx-xQFN28INA3221TPS54620RGYRXC6220B331MRPad_BatteryESP32-WROOM-32D-N4

Hand main bill of materials (BOM)

105 components, 43 distinct parts.

QtyPartRefs
5
Pad 3
U1, U8, U9, U10, U12
1
CP2102N-Axx-xQFN28
U2
2
INA3221
U3, U4
1
TPS54620RGYR
U5
1
XC6220B331MR
U6
1
Pad_Battery
U7
1
ESP32-WROOM-32D-N4
U14
2
SS8050
Q2, Q3
1
USB_C_Receptacle_USB2.0_16P
J1
1
Fuse
F1
1
SW_SPDT
SW1
2
WS2812B2020
D1, D2
1
LED
D3
2
D_Schottky
D4, D5
1
SPM10040T-3R3M-HZ
L1
13
100nF
C1, C4, C22, C30, C38, C39, C40, C42 +5
7
4.7uF
C2, C3, C23, C41, C43, C48, C50
7
47uF
C5, C6, C7, C8, C31, C32, C36
2
22uF
C20, C24
2
1uF
C21, C25
Show 23 more
QtyPartRefs
1
10uF
C26
1
4.7uF
C27
1
5.6nF
C28
1
82pF
C29
1
2.2nF
C33
1
10nF
C37
1
1uF
C69
2
5.1K
R3, R4
1
24K
R5
1
47K
R6
1
4.7K
R7
1
0R
R8
15
10K
R9, R10, R11, R18, R31, R32, R33, R34 +7
1
330R
R12
1
102K
R13
1
36.5K
R15
1
3.92K
R16
1
50K
R17
1
28.7K
R19
1
300K
R20
1
100K
R21
10
10R
R22, R23, R26, R27, R29, R30, R40, R41 +2
5
0.1
R24, R25, R28, R37, R38

Hand main design files

The KiCad project lives in the SonDinh23/EMGBand-HandBionic repository on GitHub; these links point at the commit this page was built from.

Hand main: common questions

What microcontroller does the Hand main use?

The Hand main is built around the ESP32-WROOM-32D-N4, from the ESP32 family.

How big is the Hand main PCB?

The Hand main measures 70 × 45 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Hand main?

105 components, from 43 distinct parts. The full bill of materials is listed on this page.

Where can I download the Hand main design files?

From the SonDinh23/EMGBand-HandBionic repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Hand main design in my own project?

Yes, under the terms of its GPL-3.0 license, which SonDinh23 chose for the repository.

Can I test firmware for the Hand main 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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