2 layers353.8 × 116.1 mm
2 layers304.8 × 83.1 mm
Chasma
bbrfkr/chasma-keyboard- Size
- 304.8 × 83.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 188
- Nets
- 159
- Pads
- 853
- Tracks, vias
- 3,024, 591
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 3 Nov 2022
- Updated
- 27 Apr 2023
Overview
Chasma is an open-source printed circuit board by bbrfkr, from the bbrfkr/chasma-keyboard repository on GitHub, published under the MIT licence. It is a 2-layer board of 304.8 × 83.1 mm with 188 parts on 159 nets, routed with 3,024 tracks and 591 vias.
It is built around the ATMEGA32U4-AU, SK6812MINI-E and WS2812B, with the TS-1187A-B-A-B among its other parts. Its parts include 106 diodes, 53 switches, 7 capacitors, 6 resistors and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
4
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)
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
TS-1187A-B-A-B
SMD-4P,5.1x5.1mm-30℃~+85℃ 1.5mm 1.6N 100,000 cycles 12V 5.1mm 5.1mm 50mA Gold No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.1x5.1mm Tactile Switches ROHSXKB ConnectionTactile Switches
Parts
188| Qty | Value | Footprint | References |
|---|---|---|---|
| 53 | D | random-keyboard-parts:D_SOD-123-Pretty | D00_00, D00_01, D00_02, D00_03, D01_00, D01_01, D01_02, D01_03, D02_00, D02_01, D02_02, D02_03, D03_00, D03_01, D03_02, D03_03 +37 |
| 53 | SK6812MINI-E | SK6812MINI-E:SK6812MINIE | LED00_00, LED00_01, LED00_02, LED00_03, LED01_00, LED01_01, LED01_02, LED01_03, LED02_00, LED02_01, LED02_02, LED02_03, LED03_00, LED03_01, LED03_02, LED03_03 +37 |
| 39 | SW_Push | MX_Only:MXOnly-1U-Hotswap | SW01_00, SW01_01, SW01_02, SW02_00, SW02_01, SW02_02, SW03_00, SW03_01, SW03_02, SW04_00, SW04_01, SW04_02, SW05_00, SW05_01, SW05_02, SW06_00 +23 |
| 12 | WS2812B | WS2812B:WS2812B | ULED00, ULED01, ULED02, ULED03, ULED04, ULED05, ULED06, ULED07, ULED08, ULED09, ULED10, ULED11 |
| 6 | SW_Push | MX_Only:MXOnly-1.25U-Hotswap | SW00_03, SW01_03, SW02_03, SW05_03, SW09_03, SW10_03 |
| 3 | 0.1μF | Capacitor_SMD:C_1206_3216Metric | C3, C4, C5 |
| 2 | 10k | Resistor_SMD:R_1206_3216Metric | R0, R5 |
| 2 | 22 | Resistor_SMD:R_1206_3216Metric | R1, R2 |
| 2 | 22pF | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 2 | 5.1k | Resistor_SMD:R_1206_3216Metric | R3, R4 |
| 2 | SW_Push | MX_Only:MXOnly-1.5U-Hotswap | SW00_00, SW13_00 |
| 2 | SW_Push | MX_Only:MXOnly-2.25U-Hotswap-ReversedStabilizers | SW03_03, SW12_01 |
| 2 | SW_Push | MX_Only:MXOnly-1.75U-Hotswap | SW00_01, SW11_02 |
| 1 | 10μF | Capacitor_SMD:C_1206_3216Metric | C6 |
| 1 | 16Mhz | Crystal:Crystal_SMD_SeikoEpson_FA238-4Pin_3.2x2.5mm | Y0 |
| 1 | 1μF | Capacitor_SMD:C_1206_3216Metric | C0 |
| 1 | ATmega32U4-A | Package_QFP:TQFP-44_10x10mm_P0.8mm | U0 |
| 1 | SW_Push | MX_Only:MXOnly-2.25U-Hotswap | SW00_02 |
| 1 | SW_Push | MX_Only:MXOnly-2.75U-Hotswap-ReversedStabilizers | SW07_03 |
| 1 | TS-1187A-B-A-B | TS-1187A-B-A-B:SW_TS-1187A-B-A-B | R_SW0 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J0 |
Questions
How big is the Chasma PCB?
It measures 304.8 × 83.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chasma use?
188 parts, built around the ATMEGA32U4-AU, SK6812MINI-E, WS2812B and TS-1187A-B-A-B. 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 Chasma KiCad files?
From the bbrfkr/chasma-keyboard repository on GitHub, at the commit this page was made from: the board is chasma.kicad_pcb and its schematic chasma.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chasma design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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