2 layers89 × 124 mm
Hub20
joshajohnson/Hub20
Hub20 is a numpad with a bunch of features you never knew you needed.
183 parts68
2 layers390 × 120.2 mm
Keyboard
joshajohnson/entropy97Strange keyboard with a left hand numpad
- Size
- 390 × 120.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 334
- Nets
- 200
- Pads
- 1,232
- Tracks, vias
- 2,437, 459
- Pours
- 727
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 8 Jun 2020
- Updated
- 19 Dec 2021
Overview
Keyboard is an open-source printed circuit board by joshajohnson, from the joshajohnson/entropy repository on GitHub. It is a 2-layer board of 390 × 120.2 mm with 334 parts on 200 nets, routed with 2,437 tracks and 459 vias.
It is built around the AP2112K-3.3, USBLC6-2SC6 and WS2812B, with the SK6812MINI-EA, BSS138 and DTC123JE among its other parts. Its parts include 41 capacitors, 21 diodes, 8 resistors, 3 ICs and 2 transistors. It belongs with the keyboards and input boards and the STM32 boards of this library.
Main components
6
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
SK6812MINI-EA
SMD-4P,3.2x2.8mm-40℃~+85℃ 0.6mA 1.78mm 100ns 100ns 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 500ns 520nm~530nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Built-in power-on reset circuit Translucent Frosted Lens SMD-4P,3.2x2.8mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
DTC123JE
SOT-523-55℃~+150℃ 1 NPN (Pre-Biased) 1.1V 100mA 150mW 2.2kΩ 250MHz 26 300mV 300mV 500mV@100uA,5V 50V 80 NPN SOT-523 Digital Transistors ROHSHXY MOSFETDigital Transistors
README
README.mdEntropy
A 96% Southpaw keyboard, with split space and encoder support.
Entropy started as a STM32 powered keyboard running QMK and enclosed in a FR4 and PLA case, but at the time of writing runs on a nRF52 and ZMK, tucked inside a stacked acrylic case.
ZMK enables wireless functionality, and you'll get upwards of 6 months battery life thanks to the 200uA sleep current.
It also supports up to 4 rotary incoders in 5 different positions, along with a myriad of layout options.
Photos
Layout
Supports Encoders in (0,0)...(0,3) and (0,19)
ZMK versions only allow 4 encoders to be populated (hiting interrupt limit with 5 encoders)
Revision History
R0.1:
- Original STM32 design, no bugs that can't be worked around.
- Tested and working.
R0.2:
- Removed overengineering, modified to suit JLCSMT.
- Fixed plate 2U tight fit.
- Has known issues with powering the LEDs, do not use
Image of R0.1 and R0.2 Design
R0.3:
- Moved to nRF52840 and ZMK due to supply issues with the STM32F303 used in R0.1 and R0.2.
- Case design changed to plate mount in stacked acrylic case.
- Design moved to KiCad V6.
R0.4:
- Battery life and design improvements over R0.3.
- Few issues requiring rework but suitable for use.
R0.5:
- Resolved issues found in R0.4, however untested.
- Use at your own risk.
Parts
334| Qty | Value | Footprint | References |
|---|---|---|---|
| 112 | 1N4148 | Diode_SMD:D_SOD-123 | D_0, D_1, D_10, D_11, D_100, D_101, D_102, D_103, D_104, D_105, D_106, D_107, D_108, D_110, D_112, D24 +96 |
| 94 | KEYSW | josh-keyboard:MXOnly-1U-NoLED | K_10, K_11, K_12, K_13, K_14, K_15, K_105, K_106, K_107, K_108, K_109, K_113, K_114, K_115, K_117, K_118 +78 |
| 34 | 100n | Capacitor_SMD:C_0603_1608Metric | C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25 +18 |
| 16 | WS2812B | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D15, D17, D20 |
| 12 | 3.5mm ID | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12 |
| 5 | 10K | Resistor_SMD:R_Array_Convex_4x0603 | RN1, RN2, RN3, RN4, RN5 |
| 5 | Encoder_MX | josh-keyboard:MX_KEYSWITCH_ENCODER | K_0, K_1, K_2, K_3, K_19 |
| 4 | KEYSW | josh-keyboard:MXOnly-1.5U-NoLED | K_44, K_57, K_103, K_104 |
| 4 | KEYSW | josh-keyboard:MXOnly-1.25U-NoLED | K_99, K_100, K_101, K_111 |
| 4 | SK6812-MINI-E | josh-led:SK8612-MINI-E | D21, D22, D23, D25 |
| 3 | 1K5 | Resistor_SMD:R_0603_1608Metric | R9, R10, R11 |
| 3 | KEYSW | josh-keyboard:MXOnly-2U-NoLED | K_37, K_40, K_78 |
| 3 | KEYSW | josh-keyboard:MXOnly-2.25U-ReversedStabilizers-NoLED | K_75, K_82, K_112 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric | C3, C40 |
| 2 | 1u | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 22P | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 2 | 5K1 | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | 600R | josh-passives-smt:Ferrite_Bead_0603 | FB1, FB2 |
| 2 | KEYSW | josh-keyboard:MXOnly-1.75U-NoLED | K_63, K_93 |
| 1 | 100K | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C26 |
| 1 | 500mA | josh-passives-smt:Fuse_0805_2012Metric | F1 |
| 1 | 8MHz | josh-oscillators:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BSILK | graphics:back_silk_v0 | LOGO4 |
| 1 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_Murata_PKMCS0909E4000-R1 | BZ1 |
| 1 | DTC123J | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | Josh-Details | josh-logos:josh-details | LOGO2 |
| 1 | Josh-Logo | josh-logos:josh-johnson-logo-17x3 | LOGO1 |
| 1 | KEYSW | josh-keyboard:MXOnly-2.75U-ReversedStabilizers-NoLED | K_110 |
| 1 | KEYSW | josh-keyboard:MXOnly-2U-ReversedStabilizers-NoLED | K_98 |
| 1 | KEYSW | josh-keyboard:MXOnly-6.25U-ReversedStabilizers-NoLED | K_102 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D14 |
| 1 | OSHW Logo | josh-logos:OSHW_Logo_3.6x3.6_F.Mask | LOGO3 |
| 1 | STM32F303RCTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U3 |
| 1 | SWD | josh-connectors:STM_4_PIN_THT_Staggered | J2 |
| 1 | SW_Push | josh-buttons-switches:Panasonic_EVQPUL_EVQPUC | SW1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0 | josh-connectors:USB_C_U262-161N-4BVC11 | J1 |
Questions
How big is the Keyboard PCB?
It measures 390 × 120.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keyboard use?
334 parts, built around the AP2112K-3.3, USBLC6-2SC6, WS2812B and SK6812MINI-EA. 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 joshajohnson/entropy repository on GitHub, at the commit this page was made from: the board is hardware/0.1/keyboard.kicad_pcb and its schematic hardware/0.3-w/keyboard.kicad_sch. 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 joshajohnson before reusing the design.
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