HardLabs

Stepper mouse-2025a

daisuke-ym·micro-mouse·PCB/stepper-mouse-2025a/stepper-mouse-2025a.kicad_pcb

Stepper mouse-2025a PCB layout, top view — open source ESP32 board by daisuke-ym

About the Stepper mouse-2025a PCB

Stepper mouse-2025a is an open source ESP32 PCB design by daisuke-ym, published on GitHub. It is a 2-layer board measuring 85 × 114 mm, with 85 components from 24 distinct parts.

Its main chip is the ESP32-DevKitC, from the ESP32 family. Other key parts include the AE-BNO055. By type, the board carries 34 resistors, 14 transistors, 14 diodes, 7 capacitors, 5 switches and 4 LEDs.

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

From the project

マイクロマウスは自立型ロボットが自律的に（自分の力だけで）迷路を探索し、 ゴールまで到達するものです。

マイクロマウスは自立型ロボットが自律的に（自分の力だけで）迷路を探索し、 ゴールまで到達するものです。

競技会もあります。 詳細は 公益財団法人ニューテクノロジー振興財団 を参照してください。

上記競技会ではクラシッククラスとハーフサイズクラスがありますが、 ここでは1区画180㎜のクラシッククラスを作ります。

RT ROBOT SHOP 等でキットが販売されていますが、高価なため個人や学生が手を出すには敷居が高いです。

そこで、3Dプリンタ、我らの秋月電子通商、中国のプリント基板業者を駆使することで 1万円以内で製作できることを目指しました。

ただし、採用しているステッピングモーター（28BYJ-48）は回転速度が遅い[^1]ため、 上記競技会で完走するのは難しいです。 主に教材用と考えてもらえればと思います。

- Arduino IDE - ESP32 ツールチェイン - Unistep2_mod ライブラリ（動的に回転速度を変更できるようにしたもの）

Main components on the Stepper mouse-2025a

ESP32-DevKitCAE-BNO055

Stepper mouse-2025a bill of materials (BOM)

85 components, 24 distinct parts.

QtyPartRefs
1
ESP32-DevKitC
U1
1
AE-BNO055
U2
2
AO3401A
Q1, Q2
8
AO3402
Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10
4
BSS138
Q11, Q12, Q13, Q14
1
STEPPER L
J1
1
STEPPER R
J2
1
Power
J3
1
AQM1602Y
LCD1
1
SW1
SW1
1
SW2
SW2
1
RESET
SW3
1
L_POWER
SW4
1
M_POWER
SW5
1
VAL**
TAMIYA70144
4
L-51ROPT1D1
PH1, PH2, PH3, PH4
1
GREEN
D1
1
RED
D2
8
1N4007
D3, D4, D5, D6, D7, D8, D9, D10
4
OSI5FU5111C-40
D11, D12, D13, D14
Show 4 more
QtyPartRefs
7
1u
C1, C2, C3, C4, C5, C6, C7
6
1k
R1, R2, R23, R26, R29, R32
16
10k
R3, R4, R6, R8, R10, R12, R14, R16 +8
12
10
R5, R7, R9, R11, R13, R15, R17, R19 +4

Stepper mouse-2025a design files

The KiCad project lives in the daisuke-ym/micro-mouse repository on GitHub; these links point at the commit this page was built from.

Stepper mouse-2025a: common questions

What microcontroller does the Stepper mouse-2025a use?

The Stepper mouse-2025a is built around the ESP32-DevKitC, from the ESP32 family.

How big is the Stepper mouse-2025a PCB?

The Stepper mouse-2025a measures 85 × 114 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Stepper mouse-2025a?

85 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Stepper mouse-2025a design files?

From the daisuke-ym/micro-mouse repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Stepper mouse-2025a design in my own project?

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

Can I test firmware for the Stepper mouse-2025a 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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