2 layers197.1 × 44.7 mm CearusTab, the printed circuit board in 3D

CearusTab

A well engineered and uniquely shaped mechanical macro keyboard made for the open source community!

Size: 197.1 × 44.7 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 42
Nets: 46
Pads: 168
Tracks, vias: 432, 45
Pours: 2
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 3 Dec 2020
Updated: 6 Dec 2022

Overview

CearusTab is an open-source printed circuit board by Damocles2, from the Damocles2/CaerusTab repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 197.1 × 44.7 mm with 42 parts on 46 nets, routed with 432 tracks and 45 vias.

It is built around the ATMEGA32U4-AU and TPD2S017DBV. Its parts include 16 resistors, 8 capacitors, 8 switches, 2 ICs and 2 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

README

README.md

CaerusTab

Introducing CearusTab! A well engineered and uniquely shaped macro keyboard that also happens to be open source!

Named after the roman personification of opportunity, luck and favorable moments https://en.wikipedia.org/wiki/Caerus, the CearusTab is designed in the shape of a stick in order to allow it to be used in versatile ways that a standard macro keyboard simply cannot, one of the more outstanding example being over your main keyboard, thus allowing you to keep your hands on the keyboard while using your computer.

This corrects one of the major design flaws of the classic macro keyboard, and improves your efficiency in a significant way.

It is also important to mention its programmability. As it is open source and you are expect to make your own code for it, you can program it to do anything you wish, even move your mouse(https://www.arduino.cc/reference/en/language/functions/usb/mouse/).

You can assure yourself that this is among the best macro keyboards when set up properly (as in it ticks all the boxes required or possibly desired), however it does take some basic programming skills to program.

Parts

Qty	Value	Footprint	References
9	10k	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R4, R9, R10, R11, R12, R13, R14, R15, R16
8	mx_mechanical	Switch:switch_mx	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8
3	1uF	Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder	C2, C4, C7
2	0.1uF	Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder	C3, C8
2	22R	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R2, R3
2	22pF	Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder	C5, C6
2	LED	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	Power_red1, Yellow1
1	100	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R8
1	10uF	Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder	C1
1	16mhz 30ppm 12pF	Crystal:Crystal_HC49-4H_Vertical	Y1
1	190	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R1
1	1M	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R6
1	3.3v	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R7
1	330	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	R5
1	ATmega32U4-AU	Package_QFP:TQFP-44_10x10mm_P0.8mm	U2
1	Conn_01x02_Male	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	usb_boot1
1	Conn_01x05_Male	Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical	J2
1	Polyfuse 500ma	Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder	F1
1	SW_Push	Resistor_SMD:R_1210_3225Metric_Pad1.42x2.65mm_HandSolder	reset1
1	TPD2S017	Package_TO_SOT_SMD:SOT-23-6	U1
1	USB_B_Micro	Connector_USB:USB_Micro-B_Molex-105017-0001	J1

Questions

How big is the CearusTab PCB?

It measures 197.1 × 44.7 mm and has 2 copper layers, 1.6 mm thick.

What parts does the CearusTab use?

42 parts, built around the ATMEGA32U4-AU and TPD2S017DBV. 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 CearusTab KiCad files?

From the Damocles2/CaerusTab repository on GitHub, at the commit this page was made from: the board is CaerusTab kicad project file/CearusTab.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the CearusTab design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Keyboards and input AVR (ATmega, ATtiny)

Topics

macrokeyboard mechanical-keyboard electronics-engineering arduino atmega32u4

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/damocles2-caerustab" title="CearusTab 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/damocles2-caerustab.jpg" alt="CearusTab" width="1200" height="900">

A picture that opens the board, for a README

[![CearusTab](https://pcbkit.io/embed/boards/damocles2-caerustab.jpg?size=s)](https://pcbkit.io/boards/damocles2-caerustab)

Source

Repository: Damocles2/CaerusTab
Board file: CaerusTab kicad project file/CearusTab.kicad_pcb
Commit: fc3a1bb
Licence: GPL-3.0

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