2 layers272.1 × 112.3 mm
Panel
ericrlau/SP56
Bluetooth low engery keyboard. Layout based on Sofle keyboard with some modifications. NRF52840 powered. Designed around Kaihl Choc switches and spacing.
198 parts9CC-BY-SA-4.0
2 layers272.1 × 98 mm
SP56
ericrlau/SP569Bluetooth low engery keyboard. Layout based on Sofle keyboard with some modifications. NRF52840 powered. Designed around Kaihl Choc switches and spacing.
- Size
- 272.1 × 98 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 195
- Nets
- 176
- Pads
- 741
- Tracks, vias
- 1,362, 188
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20210228)
- Created
- 6 Dec 2020
- Updated
- 1 Apr 2021
Overview
SP56 is an open-source printed circuit board by ericrlau, from the ericrlau/SP56 repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 272.1 × 98 mm with 195 parts on 176 nets, routed with 1,362 tracks and 188 vias.
It is built around the E73-2G4M08S1C, AP2112K-3.3 and LN2054Y42AMR, with the A03407A and SM02B-SRSS-TB(LF)(SN) among its other parts. Its parts include 62 diodes, 56 switches, 18 resistors, 16 capacitors and 8 connectors. It belongs with the keyboards and input boards of this library.
Main components
5
E73-2G4M08S1C
SMD,18x13mm-103dBm、-95dBm -40℃~+85℃ 120m 17.05mA 3.3V 8.27mA 8dBm Bluetooth 5.0、Bluetooth 4.2 PWM、SPI、ADC、USB、I2C、ISP、JTAG、DMA nRF52840 Chip SMD,18x13mm Bluetooth Modules ROHSChengdu Ebyte Elec TechBluetooth Modules
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorisedLN2054Y42AMR
SOT-23-5L-40℃~+85℃ 1 2uA 4.25V~6.5V 4.2V 500mA Charging IC Lithium Battery SOT-23-5L Battery Management ROHSNATLINEARBattery Management
A03407A
SOT-23SOT-23 New Arrivals ROHSAlpha & Omega SemiconductorUncategorised
SM02B-SRSS-TB(LF)(SN)
SMD,P=1mm,卧贴-25℃~+85℃ 1 1A 1mm 1x2P 2 2.9mm 2P 4.32mm 4mm 50V Auxiliary Solder Pin Copper alloy PA SH Surface Mount, Right Angle Tin UL94V-0 White SMD,P=1mm,卧贴 Wire To Board Connector ROHSJSTWire To Board Connector
README
README.mdSP56
A ZMK-Powered BLE Keyboard, Inspired By Lily58 & Sofle
:warning: This is a partially tested project. Do not use to create your own copy unless you are willing to debug the hardware and/or firmware.
Flash bootloader
Bootloader is pre-loaded on assembled pcbs. If you source your own BLE module you will need to unlock the module and flash the bootloader using the Nordic nrf command line tool.
$ nrfjprog --recover --log $ nrfjprog -f nrf52 --program firmware/bootloader/COBO_nrf52840_bootloader-0.3.2-184-g64ea299_s140_6.1.1.hexUpload Firmware
- See ZMK docs for instructions on setting up ZMK and custimizing firmware.
- Default *.uf2 files are pre-loaded on assembled pcbs. If you sourced and assembled your own pcb, you can file deafult pre-built firmware here:
PCB
- Source files for pcb are in this repo. They are split into three kicad projects:
- SP56: main pcb, left and right combined.
- SP56_Bottom: Bottom cover PCB. Left and right use the same part so only one copy is created.
- SP56_Plate: Switch plate PCB. This must be 1.2mm pcb to allow Kaihl Choc V1 switches to snap in. Left and right use the same part so only one copy is created.
- NOTE: KiCad files are created with nightly KiCad 5.99 builds, they are not compatible with current stable release of KiCad 5.
- Bill of materials BOM Link
Build Guide For PCBA
Images
Prototype Build
Main PCB
FR4 Plate
Bottom PCB
Parts
195| Qty | Value | Footprint | References |
|---|---|---|---|
| 56 | D | Diode_SMD:D_SOD-123 | D1, D10, D11, D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113 +40 |
| 52 | SW_PUSH | BlueSof:KailhLowProfile | SW1, SW10, SW11, SW101, SW102, SW103, SW104, SW105, SW106, SW107, SW108, SW109, SW110, SW111, SW112, SW113 +36 |
| 16 | MountingHole_Pad | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16 |
| 4 | .1uF | Capacitor_SMD:C_0603_1608Metric | C6, C7, C106, C107 |
| 4 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R6, R101, R106 |
| 4 | 22pF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C103, C104 |
| 4 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C101, C102 |
| 4 | 5.1k | Resistor_SMD:R_0603_1608Metric | R7, R8, R107, R108 |
| 4 | LED | LED_SMD:LED_0603_1608Metric | D31, D32, D131, D132 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R9, R103 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R102 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C5, C105 |
| 2 | 1M | Resistor_SMD:R_0603_1608Metric | R3, R10 |
| 2 | 1N5819 | Diode_SMD:D_SOD-323_HandSoldering | D33, D133 |
| 2 | 2M | Resistor_SMD:R_0603_1608Metric | R5, R105 |
| 2 | 32.768kHz | Crystal:Crystal_SMD_MicroCrystal_CM9V-T1A-2Pin_1.6x1.0mm_HandSoldering | Y1, Y101 |
| 2 | 4.7nF | Capacitor_SMD:C_0603_1608Metric | C8, C9 |
| 2 | 820k | Resistor_SMD:R_0603_1608Metric | R4, R104 |
| 2 | A03407 | Package_TO_SOT_SMD:SOT-23 | Q1, Q102 |
| 2 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U3, U103 |
| 2 | Conn_01x01_Female | Connector_PinSocket_1.27mm:PinSocket_1x01_P1.27mm_Vertical | J103, J104 |
| 2 | Conn_01x01_Male | Connector_PinSocket_1.27mm:PinSocket_1x01_P1.27mm_Vertical | J2, J3 |
| 2 | Conn_01x04_Female | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | SWD/C1, SWD/C101 |
| 2 | E73-2G4M08S1C | BlueSof:E73-2G4M08S1C_LCSC | U2, U102 |
| 2 | LN2054Y42AMR | Package_TO_SOT_SMD:SOT-23-5 | U1, U101 |
| 2 | Rotary_Encoder_Switch | BlueSof:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm_NoSilkScreen | SW25, SW125 |
| 2 | SM02B-SRSS-TB(LF)(SN) | BlueSof:SM02B-SRSS-TB(LF)(SN) | J9, J106 |
| 2 | SW_PUSH | BlueSof:KailhLowProfile_1.5U | SW26, SW126 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_B3U-1000P | RESET1, RESET101 |
| 2 | SW_SPDT | BlueSof:SW-TH_MSK12C02 | BATT1, BATT101 |
| 2 | USB_C_Receptacle_USB2.0 | BlueSof:USB-C_C168688 | J1, J101 |
The 192 most common of 195 parts.
Questions
How big is the SP56 PCB?
It measures 272.1 × 98 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SP56 use?
195 parts, built around the E73-2G4M08S1C, AP2112K-3.3, LN2054Y42AMR and A03407A. 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 SP56 KiCad files?
From the ericrlau/SP56 repository on GitHub, at the commit this page was made from: the board is PCB/SP56/SP56.kicad_pcb and its schematic PCB/REF_Panel/REF_Panel.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SP56 design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
More from ericrlau/SP56
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Bluetooth low engery keyboard. Layout based on Sofle keyboard with some modifications. NRF52840 powered. Designed around Kaihl Choc switches and spacing.
38 parts9CC-BY-SA-4.0 - 2 layers134.8 × 98 mm
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8 parts9CC-BY-SA-4.0
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