2 layers91.5 × 94.3 mm Keypad, the printed circuit board in 3D

Keypad

5x5 mechanical keyboard, demonstrating the capabilities of the cheapest boards possible from a PCB manufacturer

Size: 91.5 × 94.3 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 67
Nets: 68
Pads: 427
Tracks, vias: 1,455, 78
Pours: 2
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 1 Sep 2018
Updated: 1 Sep 2018

Overview

Keypad is an open-source printed circuit board by litruv, from the litruv/5x5Keypad repository on GitHub. It is a 2-layer board of 91.5 × 94.3 mm with 67 parts on 68 nets, routed with 1,455 tracks and 78 vias.

It is built around the ATMEGA32U4-AU, WS2812B and 12401598E4#2A. Its parts include 26 ICs, 16 capacitors, 12 diodes, 4 resistors and 1 transistor. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

5x5 Keypad

Parts

Qty	Value	Footprint	References
25	MXDiode	CMX:HybridMatiasCMX	U1, U2, U10, U12, U13, U14, U15, U16, U17, U18, U19, U20, U21, U22, U23, U24 +9
13	0.1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C3, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16
12	WS2812B	LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm	D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15
2	22	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R3, R4
2	22pF	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C1, C2
2	AudioJack4_Ground	Keebio-Parts:TRRS-PJ-320A	TRRS1, TRRS2
1	1.5k	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R6
1	10K	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R1
1	12401598E4#2A	Type-C:12401598E4#2A	USB1
1	16MHz	Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm_HandSoldering	Y1
1	1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C4
1	ATmega32U4-AU	Package_QFP:TQFP-44_10x10mm_P0.8mm	U11
1	AVR-ISP-6	Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical	J1
1	Polyfuse	Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder	F1
1	Q_NPN_BCE	Package_TO_SOT_SMD:SOT-223-3_TabPin2	Q1
1	SW_Push	Keebio-Parts:CandK_6x6mm_Tactile	SW1
1	USB_B	Connector_USB:USB_Micro-B_Wuerth_629105150521	USB2

Questions

How big is the Keypad PCB?

It measures 91.5 × 94.3 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Keypad use?

67 parts, built around the ATMEGA32U4-AU, WS2812B and 12401598E4#2A. 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 Keypad KiCad files?

From the litruv/5x5Keypad repository on GitHub, at the commit this page was made from: the board is Keypad.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Keypad design in my own project?

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

Category and platform

Keyboards and input AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/litruv-5x5keypad" title="Keypad in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/litruv-5x5keypad.jpg" alt="Keypad" width="1200" height="900">

A picture that opens the board, for a README

[![Keypad](https://pcbkit.io/embed/boards/litruv-5x5keypad.jpg?size=s)](https://pcbkit.io/boards/litruv-5x5keypad)

Source

Repository: litruv/5x5Keypad
Board file: Keypad.kicad_pcb
Commit: 2f45a29
Licence: Not stated

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