4 layers350 × 195 mm
2 layers
Keyboard
EfficientThings/GuavaBook1A Big(CM4)-Little(emacsOS) based laptop
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 109
- Nets
- 37
- Pads
- 886
- Tracks, vias
- 1,161, 66
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 24 Feb 2021
- Updated
- 4 Mar 2021
Overview
Keyboard is an open-source printed circuit board by EfficientThings, from the EfficientThings/GuavaBook repository on GitHub. It is a 2-layer board with 109 parts on 37 nets, routed with 1,161 tracks and 66 vias.
It is built around the ATMEGA32U4-AU and CD74HC4067M. Its parts include 101 switches, 3 capacitors, 2 ICs, 1 resistor and 1 connector. It belongs with the computers and single-board computers and keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA32U4-AU
QFP-44(10x10)-40℃~+85℃ 10bit 16MHz 1KB 2.5KB 2.7V~5.5V 26 32KB 8 Bit AVR Built-in FLASH QFP-44(10x10) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CD74HC4067M
SOIC-24-300mil-55℃~+125℃ 16 160Ω 16:1 22ns 2V~6V 345ns 365ns 89MHz Bidirectional analog channel、Glitch-free switching SOIC-24-300mil Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
README
README.mdGuavaBook
A Big(CM4)-Little(emacsOS) based laptop
VERY work in progress...
Think chromebook(but not necesarily running ChromeOS), but with a mechanical keyboard(kailh choco), 4k display, intearnal SSD and rtlSDR, and fully open source. Desighned to run an ultralight emacsOS for low power mode or just because. Fanless cooling of CM4 allows for completely silent operation and complete lack of adhesives makes the device fully repairable!
Parts
109| Qty | Value | Footprint | References |
|---|---|---|---|
| 100 | SW_MEC_5G | Libs:Kailh_socket_PG1350 | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW100 +84 |
| 2 | 22pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | ATmega32U4-AU | Package_QFP:TQFP-44_10x10mm_P0.8mm | U2 |
| 1 | CD74HC4067M | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U3 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | Crystal | Crystal:Crystal_C26-LF_D2.1mm_L6.5mm_Horizontal | Y1 |
| 1 | R_Small_US | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_6x6mm_H9.5mm | SW101 |
Questions
What parts does the Keyboard use?
109 parts, built around the ATMEGA32U4-AU and CD74HC4067M. 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 Keyboard KiCad files?
From the EfficientThings/GuavaBook repository on GitHub, at the commit this page was made from: the board is Keyboard/keyboard.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keyboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask EfficientThings before reusing the design.
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