4 layers92 × 78 mm Mathpad, the printed circuit board in 3D

Mathpad

這款鍵盤靈感來自Summa-Congni/Mathpad，當我在2025年的某日給女朋友看到能夠方便輸入數學符號的Mathpad 她知道我喜歡也能製做出電路板，便鼓勵我著手製作此project而誕生。此板為第一版設計，製作時有許多問題導致設計不斷變更直到最後。主要思路為無線藍芽連接內置5V USB Type C充電電路並提供電量指示燈、有OLED螢幕可供視覺回饋挑選符號

Full screen GitHub .kicad_pcb

Size: 92 × 78 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 93
Nets: 76
Pads: 292
Tracks, vias: 522, 229
Pours: 30
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 13 Sep 2026
Updated: 15 Sep 2026

Overview

Mathpad is an open-source printed circuit board by mbayrao, from the mbayrao/YMC-Mathpad repository on GitHub. It is a 4-layer board of 92 × 78 mm with 93 parts on 76 nets, routed with 522 tracks and 229 vias.

It is built around the ESP32-C3FH4, RT6154AGQW and TP4054, with the USBLC6-2P6, 1N5817WS and ANT3216LL00R2400A among its other parts. Its parts include 20 capacitors, 19 switches, 18 diodes, 17 resistors and 4 ICs. It belongs with the ESP32 and RISC-V boards of this library.

Main components

README

README.md

YMC-Mathpad

Overview

這是我第一次用Git…有好多操作要學…Work on it...

Wireless：Buletooth 5
Screen Size：0.96 inch
Layout：正交排列,按鍵數量6(Maxium: 12) 鍵位配置為上、下、左、右、Enter及切換下一頁的Layer鍵
MCU： ESP32-C3FH4
Firmware：自訂韌體(使用Arduino IDE)
Battery life： 5hrs(600mAh lithium batteries)
Mathematical Symbols：56個符號(一頁14個，共四頁)，根據需求還可以再擴充
Dimension：101mm x 87mm x 13mm

Features

使用Gateron Low Profile THT軸體搭配白色矮鍵， 0.96吋雙色I2C OLED螢幕顯示現在電量、數學符號及實際發送文字

數學符號

Layer1： ±×÷…≤≥≠√∑∏∞αβγ

Layer2： δεμφπσθ∈∉∫∂∆∇≈

Layer3： ≅≡∪∩≃≄∨∧∴∵⊆⊇⊂⊃

Layer4： ⊗⊕⊙∀∃ℕℤℚℝℍℙρ⇒⇔

Repository Contents

此 Repository 包含自行製作一把鍵盤所需的所有檔案：

Folder	Contents
`/hardware/pcb`	KiCad/Eagle 電路圖、PCB 佈局、Gerber 製造檔、BOM
`/hardware/cad`	CAD 原始檔（STEP）、外殼／定位板 STEP 輸出檔
`/firmware`	韌體原始碼

Build Instructions

PCB：使用 /hardware/pcb/gerbers 中的 Gerber 製造檔，向 [JLCPCB/PCBWay/其他] 下單製作。
Case：使用 /hardware/cad 中的 STEP 檔進行 3D 列印或 CNC 加工。
Firmware：依照Arduino IDE方式進行韌體燒錄。

CAD / Case Files

Format：STEP（可編輯）、STL（可直接列印）
Software used：[Fusion 360 / FreeCAD / SolidWorks]
Location：hardware/cad/

Wiring / Schematic

完整電路圖 PDF：hardware/pcb/YMC_Mathpad_v1.pdf

Credits / Acknowledgments

本專案受到 Mathpad（作者：[nup002\dancergraham]）的啟發，並以其為基礎進行開發。

Disclaimer

本專案為業餘／開源專案，以「現況」提供，不提供任何保固。下單或焊接前，請確認所有元件的規格與額定值符合需求。

Category and platform

ESP32 RISC-V

Project files

Show this board on your page

https://pcbkit.io/boards/mbayrao/YMC-Mathpad

The board's own page, for a message or a post.

Source

Repository: mbayrao/YMC-Mathpad
Board file: Hardware/Kicad/Mathpad.kicad_pcb
Commit: 72067e3
Licence: Not stated

Parts

Qty	Value	Footprint	References
16	1N5817WS	Diode_SMD:D_SOD-123	D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18
16	SW_Push	key-switches.pretty-main:SW_Gateron_LowProfile_THT	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16
6	10k	Resistor_SMD:R_0402_1005Metric	R11, R12, R13, R16, R17, R19
5	100n	Capacitor_SMD:C_0402_1005Metric	C22, C24, C25, C26, C28
4	47uF X5R	Capacitor_SMD:C_0603_1608Metric	C10, C11, C13, C16
2	100R	Resistor_SMD:R_0603_1608Metric	R14, R15
2	100k 1%	Resistor_SMD:R_0402_1005Metric	R3, R4
2	100nF	Capacitor_SMD:C_0402_1005Metric	C14, C20
2	13pF	Capacitor_SMD:C_0402_1005Metric	C8, C9
2	1uF	Capacitor_SMD:C_0402_1005Metric	C21, C27
2	3.3pF	Capacitor_SMD:C_0402_1005Metric	C17, C18
2	5.1k 1%	Resistor_SMD:R_0402_1005Metric	R10, R18
2	Boot	Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK	SW17, SW18
1	100k_0402_1%	Resistor_SMD:R_0402_1005Metric	R2
1	10u	Capacitor_SMD:C_0402_1005Metric	C23
1	10uF	Capacitor_SMD:C_0603_1608Metric	C15
1	1A	Fuse:Fuse_0805_2012Metric	F1
1	1uF_0402	Capacitor_SMD:C_0402_1005Metric	C12
1	2.2nH	Inductor_SMD:L_0402_1005Metric	L3
1	2.2uH 3A	Inductor_SMD:L_1008_2520Metric	L2
1	24nH	Inductor_SMD:L_0402_1005Metric	L1
1	2nH	Inductor_SMD:L_0402_1005Metric	L4
1	3.3k_0603_1%	Resistor_SMD:R_0603_1608Metric	R5
1	40MHz	Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	560k_0402_1%	Resistor_SMD:R_0402_1005Metric	R1
1	680_0603	Resistor_SMD:R_0603_1608Metric	R9
1	68k_0603	Resistor_SMD:R_0603_1608Metric	R6
1	ANT3216LL00R2400A	SamacSys_Parts:ANT3216LL00R2400A	ANT1
1	AO3401A	Package_TO_SOT_SMD:SOT-23	Q1
1	BATT	Connector_JST:JST_ZH_S2B-ZR-SM4A-TF_1x02-1MP_P1.50mm_Horizontal	J3
1	COM	Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical	J2
1	ESP32-C3FH4	Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm	U2
1	Green	LED_SMD:LED_0603_1608Metric	DP2
1	LED_Dual_AKA	LED_THT:LED_D3.0mm-3	D2
1	MBR120VLSFT	Diode_SMD:D_SOD-123	D1
1	MMBT2222A	Package_TO_SOT_SMD:SOT-23	Q31
1	MSK12C02	SamacSys_Parts:MSK12C02	S1
1	RT6154AGQW	SamacSys_Parts:SON50P300X400X80-15N-D	IC1
1	Red	LED_SMD:LED_0603_1608Metric	DP1
1	TP4054	Package_TO_SOT_SMD:SOT-23-5	IC2
1	TestPoint	TestPoint:TestPoint_Pad_1.5x1.5mm	TP1
1	USBLC6-2P6	Package_TO_SOT_SMD:SOT-666	U1
1	USB_C_Receptacle_USB2.0_16P	Connector_USB:USB_C_Receptacle_GCT_USB4110	J1

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Questions

How big is the Mathpad PCB?

It measures 92 × 78 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Mathpad use?

93 parts, built around the ESP32-C3FH4, RT6154AGQW, TP4054 and USBLC6-2P6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Mathpad KiCad files?

From the mbayrao/YMC-Mathpad repository on GitHub, at the commit this page was made from: the board is Hardware/Kicad/Mathpad.kicad_pcb and its schematic Hardware/Kicad/BlockDiagram.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Mathpad design in my own project?

Its repository states no licence, so its author keeps all rights: ask mbayrao before reusing the design.

Overview

Main components

ESP32-C3FH4

RT6154AGQW

TP4054

USBLC6-2P6

1N5817WS

ANT3216LL00R2400A

AO3401A

MBR120VLSFT1

MMBT2222A

MSK12C02

README

YMC-Mathpad

Overview

Features

Repository Contents

Build Instructions

CAD / Case Files

Wiring / Schematic

Credits / Acknowledgments

Disclaimer

Parts

Similar boards

Questions

How big is the Mathpad PCB?

What parts does the Mathpad use?

Where can I download the Mathpad KiCad files?

Can I use the Mathpad design in my own project?