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Ball V4 32u4

Gamu2124·RoboCupJunior2026-RobotDatas·Circuit/JapanOpen/Ball_ATmega32U4/Ball_V4_32u4.kicad_pcb

Ball V4 32u4 PCB layout, top view — open source ESP32 board by Gamu2124
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About the Ball V4 32u4 PCB

Ball V4 32u4 is an open source ESP32 PCB design by Gamu2124, published on GitHub. It is a 2-layer board measuring 100.2 × 102.7 mm, with 97 components from 30 distinct parts.

Its main chip is the XIAO-ESP32-S3-DIP, from the ESP32 family. Other key parts include the ATMEGA32U4-A, LDO_3V3 and TSSP4038. By type, the board carries 29 capacitors, 18 diodes, 17 resistors, 16 modules, 9 connectors and 3 ICs.

It belongs with the robotics & motion, displays & leds and sensors designs in this gallery.

From the project

Complete data for the robot that won the Japan and World championships / 日本大会優勝 & 世界大会優勝したロボットの全データ

RoboCupJunior Soccer Lightweight 2026 シーズンにおいて、ジャパンオープン優勝、そして世界大会（韓国・仁川）で競技優勝・総合優勝・コミュニティ賞を達成したロボット「AIR」の設計・開発データを公開するリポジトリです。

This repository contains the design, hardware, and software data of AIR, the RoboCupJunior Soccer Lightweight 2026 Japan Open Champion and World Championship Champion.

本リポジトリは、次世代のRCJコミュニティおよび学生ロボティクスエンジニアへの情報共有を目的として公開されています。

2026シーズンの開発で使用した回路設計、組み込みソフトウェア、マルチマイコンによる分散処理システム、3D CADデータなど、AIRのロボット開発に関する設計データを公開しています。

Ball V4 32u4, from the project README
From the project README

Main components on the Ball V4 32u4

ATMEGA32U4-AXIAO-ESP32-S3-DIPLDO_3V3TSSP4038

Ball V4 32u4 bill of materials (BOM)

97 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4-A
ATmega32U4-A
U1
1
XIAO-ESP32-S3-DIP
U2
1
LDO_3V3
LDO_3v3
U3
16
TSSP4038
A1, A2, A3, A4, A5, A6, A7, A8 +8
1
CONN_02X02_ODD_EVEN
Conn_02x02_Odd_Even
J1
1
CONN_02X02_COUNTER_CLOCKWISE
Conn_02x02_Counter_Clockwise
J3
1
USS_1
J4
1
USS_3
J5
1
USS_2
J6
1
USS_4
J7
1
TYPE-C_32U4
J8
1
TYPE-C_main
J9
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J11
2
BSS138
32u4_1, 32u4_2
1
SW_Push
SW1
1
XTAL_32U4
XTAL1
1
Conn_01x06_Socket
ffc1
1
D_Schottky
D2
1
D
D3
16
WS2812B
D5, D6, D7, D8, D9, D10, D11, D12 +8
Show 10 more
QtyPartRefs
1
150
C1
1
1u
C2
8
0.1U
0.1u
C3, C4, C5, C6, C7, C9, C11, C12
17
0.1
C8, C14, C15, C16, C17, C18, C19, C20 +9
1
10U
10u
C10
1
47μf
C13
4
22
R1, R2, R3, R4
6
10K
10k
R5, R7, R9, R10, R11, R14
3
110
R6, R12, R18
4
5.1K
5.1k
R8, R13, R17, R19

Ball V4 32u4 design files

The KiCad project lives in the Gamu2124/RoboCupJunior2026-RobotDatas repository on GitHub; these links point at the commit this page was built from.

Ball V4 32u4: common questions

What microcontroller does the Ball V4 32u4 use?

The Ball V4 32u4 is built around the XIAO-ESP32-S3-DIP, from the ESP32 family.

How big is the Ball V4 32u4 PCB?

The Ball V4 32u4 measures 100.2 × 102.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ball V4 32u4?

97 components, from 30 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 Ball V4 32u4 design files?

From the Gamu2124/RoboCupJunior2026-RobotDatas 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 Ball V4 32u4 design in my own project?

The repository has no license, so all rights stay with Gamu2124. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Ball V4 32u4 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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