2 layers142.9 × 80.2 mm
Bifrost right
hringdrifi/bifrost
KiCad source files for the left half of Bifrǫst.
65 parts5CERN-OHL-P-2.0
2 layers142.9 × 80.2 mm
Bifrost left
hringdrifi/bifrost5KiCad source files for the left half of Bifrǫst.
- Size
- 142.9 × 80.2 mm
- Copper layers
- 2
- Thickness
- 1.2 mm
- Parts
- 66
- Nets
- 79
- Pads
- 339
- Tracks, vias
- 314, 1,004
- Pours
- 225
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Aug 2026
- Updated
- 11 Oct 2026
Overview
Bifrost left is an open-source printed circuit board by hringdrifi, from the hringdrifi/bifrost repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 142.9 × 80.2 mm with 66 parts on 79 nets, routed with 314 tracks and 1,004 vias.
It is built around the MDBT50Q-1MV2, SRV05-4 and TP4057, with the AO3401A, BLM15PX121SN1D11 and 1N5819WS among its other parts. Its parts include 22 switches, 13 resistors, 8 capacitors, 3 ICs and 3 transistors. It belongs with the nRF52 and nRF5x boards of this library.
Main components
9
MDBT50Q-1MV2
SMD-61PSMD-61P Bluetooth Modules ROHSRAYTACBluetooth Modules
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)TP4057
SOT-23-6-40℃~+85℃ 1 25uA 4.24V 4V~6.5V Charging IC Lithium Battery Not supported SOT-23-6 Battery Management ROHSTECH PUBLICBattery Management
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
BLM15PX121SN1D11
04020402 Ferrite Beads ROHSMurataFerrite Beads
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
E6C1209RGBC3UDA
SMD-4P,3.2x2.7mm-40℃~+85℃ 1.1mm 1.9V~2.4V 120° 180mcd~250mcd 2.7mm 2.9V~3.4V 2.9V~3.4V 3.2mm 350mcd~450mcd 460nm~472nm 517nm~530nm 600mcd~1000mcd 617nm~626nm Common Anode Top-mount Water Clear SMD-4P,3.2x2.7mm RGB LEDs ROHSEKINGLUXRGB LEDs
MSK12C02-HB
SMD,8x2.8mm-25℃~+70℃ 1.4mm 10,000 cycles 12V 2.8mm 50mA 8mm Black Rectangular Columnar SMD(SMT) Tab SPDT Surface Mount, Right Angle SMD,8x2.8mm Slide Switches ROHSSHOU HANSlide Switches
TS24CA
SMD,4.6x1.8mm-20℃~+70℃ 1.6N 1.9mm 12V 20 thousand cycles 3.5mm 4.7mm 50mA Black No Rectangular Button SMD(SMT) Tab SPST Surface Mount, Right Angle Without Bracket SMD,4.6x1.8mm Tactile Switches ROHSSHOU HANTactile Switches
README
pcb/left_kicad/README.mdBifrǫst left KiCad design
KiCad source files for the left half of Bifrǫst.
Status
This is an incomplete and unverified work in progress. Do not order boards or rely on this design without independently reviewing the schematic, layout, footprints, mechanical fit, and electrical connections.
The project was initially created from a Smiðr export, then received substantial additional modifications. It is no longer an unmodified Smiðr export.
Contents
| Design | Purpose |
|---|---|
bifrost_left.kicad_pro / .kicad_sch / .kicad_pcb | Left main PCB |
bifrost_left_plate.kicad_pro / .kicad_pcb | Left main switch plate |
bifrost_left_thumb.kicad_pro / .kicad_sch / .kicad_pcb | Left thumb-cluster PCB |
bifrost_left_thumb_plate.kicad_pro / .kicad_pcb | Left thumb-cluster switch plate |
smidr.pretty/ | Project footprint library |
local.kicad_sym | Project symbol library |
Electrical design note
The switch design uses direct GPIO connections. Each switch is connected directly between its assigned GPIO net and GND; there is no diode connected to each switch.
Libraries
fp-lib-table and sym-lib-table configure the project libraries. Keep smidr.pretty/ and local.kicad_sym with this project when opening it in KiCad.
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 1U | Smidr:SW_Smidr_Gateron_LP_Hotswap | SW2, SW3, SW4, SW5, SW6, SW8, SW9, SW10, SW11, SW12, SW14, SW15, SW16, SW17, SW18 |
| 4 | 10u | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C8 |
| 3 | 1.25U | Smidr:SW_Smidr_Gateron_LP_Hotswap | SW19, SW20, SW21 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R8, R12 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C4, C5 |
| 2 | 1k | Resistor_SMD:R_0402_1005Metric | R5, R9 |
| 2 | 27 | Resistor_SMD:R_0402_1005Metric | R6, R7 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1, Q3 |
| 2 | BLM15PX121SN1D | Inductor_SMD:L_0402_1005Metric | L2, L3 |
| 2 | LOGO | Smidr:Logo | G***, G*** |
| 1 | 1.5U | Smidr:SW_Smidr_Gateron_LP_Hotswap | SW1 |
| 1 | 1.75U | Smidr:SW_Smidr_Gateron_LP_Hotswap | SW7 |
| 1 | 100 | Resistor_SMD:R_0402_1005Metric | R11 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 100n | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 10uH | Inductor_SMD:L_0603_1608Metric | L1 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D2 |
| 1 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | 2U | Smidr:SW_Smidr_Gateron_LP_Hotswap | SW13 |
| 1 | 3.3k | Resistor_SMD:R_0402_1005Metric | R10 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_MicroCrystal_CC7V-T1A-2Pin_3.2x1.5mm | X1 |
| 1 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C7 |
| 1 | Conn_01x02 | Connector_PinHeader_1.27mm:PinHeader_1x02_P1.27mm_Vertical | J2 |
| 1 | Conn_01x06 | Connector_PinHeader_1.27mm:PinHeader_1x06_P1.27mm_Vertical | J3 |
| 1 | E6C1209RGBC3UDA | Smidr:LED_Smidr_RGB_1209 | D1 |
| 1 | HRO_TYPE-C-31-M-12 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | MDBT50Q-1MV2 | RF_Module:Raytac_MDBT50Q | U2 |
| 1 | MSK12C02-HB | Button_Switch_SMD:SW_SPDT_Shouhan_MSK12C02 | S1 |
| 1 | PTC 1A hold | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | CHG1 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | SWDCLK | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP2 |
| 1 | SWDIO | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP1 |
| 1 | TP4057 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | TS24CA | Smidr:SW_SMD_2P-TS24CA | T1 |
The 65 most common of 66 parts.
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Questions
How big is the Bifrost left PCB?
It measures 142.9 × 80.2 mm and has 2 copper layers, 1.2 mm thick.
What parts does the Bifrost left use?
66 parts, built around the MDBT50Q-1MV2, SRV05-4, TP4057 and AO3401A. 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 Bifrost left KiCad files?
From the hringdrifi/bifrost repository on GitHub, at the commit this page was made from: the board is pcb/left_kicad/bifrost_left.kicad_pcb and its schematic pcb/left_kicad/bifrost_left.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bifrost left design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).