HardLabs

Hand System Rev 1

NHuang58·Piano_Hand_Electronics·Spring_2026_Final/Hand_System_Rev_1/Hand_System_Rev_1.kicad_pcb

Hand System Rev 1 PCB layout, top view — open source ESP32 board by NHuang58

About the Hand System Rev 1 PCB

Hand System Rev 1 is an open source ESP32 PCB design by NHuang58, published on GitHub. It is a 4-layer board measuring 154.7 × 113.4 mm, with 54 components from 21 distinct parts.

Its main chip is the ESP32-DEVKITC-32UE, from the ESP32 family. Other key parts include the LM2596, A4988_STEPPER_MOTOR_DRIVER, `, MAX9814ETD_T and PCA9685PW. By type, the board carries 28 resistors, 11 modules, 8 ICs, 4 capacitors, 2 transistors and 1 connector.

It belongs with the robotics & motion and audio designs in this gallery.

From the project

API using Music 21 and MIDI to convert midi files and piano notes to coordinates for a piano hand

The KiCAD files have a full PCB design for the barrel jack, LM2896, motor servers, stepper motor driver, and microphone. This includes the Gerber files, drill files, and bill of materials. It also includes the libraries for the symbols and footprints used in this project.

Main components on the Hand System Rev 1

ESP32-DEVKITC-32UELM2596A4988_STEPPER_MOTOR_DRIVER`MAX9814ETD_TPCA9685PW

Hand System Rev 1 bill of materials (BOM)

54 components, 21 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-DEVKITC-32UE
U1
1
LM2596
U2
1
A4988_STEPPER_MOTOR_DRIVER
A4988_Stepper_Motor_Driver
U3
1
`
~
U4
1
MAX9814ETD_T
LM2596
U5
1
LM2596
U6
2
PCA9685PW
U7, U8
10
Motor_Servo
M1, M2, M3, M4, M5, M6, M8, M9 +2
1
Stepper_Motor
M7
2
IRLZ44N
Q1, Q3
1
SC2072
Barrel_Jack
J1
1
22U
22u
C1
1
3372-0805N101J201AD
100 μF
C2
1
0.1UF
10uF
C3
1
0.47UF
10uF
C4
1
150K
10k
R1
1
100K
100
R2
12
1K
R3, R4, R5, R6, R7, R8, R9, R10 +4
3
10k
R14, R28, R35
1
100
R15
Show 1 more
QtyPartRefs
10
220
R23, R24, R25, R26, R27, R36, R37, R38 +2

Hand System Rev 1 design files

The KiCad project lives in the NHuang58/Piano_Hand_Electronics repository on GitHub; these links point at the commit this page was built from.

Hand System Rev 1: common questions

What microcontroller does the Hand System Rev 1 use?

The Hand System Rev 1 is built around the ESP32-DEVKITC-32UE, from the ESP32 family.

How big is the Hand System Rev 1 PCB?

The Hand System Rev 1 measures 154.7 × 113.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Hand System Rev 1?

54 components, from 21 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 Hand System Rev 1 design files?

From the NHuang58/Piano_Hand_Electronics 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 Hand System Rev 1 design in my own project?

The repository has no license, so all rights stay with NHuang58. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Hand System Rev 1 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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