4 layers68 × 68 mm
Tile
Bruhdows/klink
Klink is a magnetic tile system for building programmable machines. First up: a marble run with sensors, buttons, lights, gates, splitters and an elevator.
122 parts
4 layers148 × 78 mm
Klink is a magnetic tile system for building programmable machines. First up: a marble run with sensors, buttons, lights, gates, splitters and an elevator.
- Size
- 148 × 78 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 85
- Nets
- 297
- Pads
- 766
- Tracks, vias
- 42, 15
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Nov 2026
- Updated
- 6 Nov 2026
Overview
Hub is an open-source printed circuit board by Bruhdows, from the Bruhdows/klink repository on GitHub. It is a 4-layer board of 148 × 78 mm with 85 parts on 297 nets, routed with 42 tracks and 15 vias.
It is built around the STM32F405RGT6, SN74LVC244APWRE4 and INA301A1IDGKR, with the LMR36520ADDAR, W25Q32JVSSIQ and TPS3808G30DBVR-TP among its other parts. Its parts include 34 ICs, 17 resistors, 14 capacitors, 4 connectors and 2 switches. It belongs with the STM32 boards of this library.
Main components
12
STM32F405RGT6
LQFP-64(10x10)-40℃~+85℃ 1.8V~3.6V 12bit 12bit 168MHz 192KB 1MB 32 Bit 51 ARM Cortex-M4 Built-in FLASH LQFP-64(10x10) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
SN74LVC244APWRE4
TSSOP-20-40℃~+125℃ 1.65V~3.6V 2 24mA 24mA 4 40uA 5.7ns@3.3V,50pF 74LVC Output enable、Level shifting Tri-State Unidirectional TSSOP-20 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffer/Driver/Transceiver
INA301A1IDGKR
VSSOP-8-40℃~+125℃ 0.5uV/℃ 0V~36V 1 110dB 120uA 2.7V~5.5V 20V/V 25uV 4V/us 550kHz 650uA High-side detection、Low-side detection、Zero drift / auto-zero、Programmable threshold alarm、Built-in comparator ±40V VSSOP-8 Current Sense Amplifiers ROHSTexas InstrumentsCurrent-Sensing Amplifiers
LMR36520ADDAR
SOPowerPAD-8-40℃~+125℃@(TJ) 1 1V~28V 2A 4.2V~65V 400kHz Adjustable Buck Buck Built-in Yes SOPowerPAD-8 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
W25Q32JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 133MHz 1uA 2.7V~3.6V 20 Years 32Mbit 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
TPS3808G30DBVR-TP
SOT-23-6SOT-23-6 Supervisor and Reset ICs ROHSTECH PUBLICUncategorised
AP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsSN74LVC1G11DBVR(AT)
SOT-23-6-40℃~+125℃ 1 1.2V、1.9V、2.3V、2.4V、3.8V 1.65V~5.5V 1.7V、2V 3 3.7ns@5V,50pF 300mV、400mV、450mV、550mV 700mV、800mV 74LVC AND Gate SOT-23-6 Logic Gates ROHSAOTELogic GatesSN74LVC1G14DBVR
SOT-23-5-40℃~+125℃ 1 1 1.65V~5.5V 10uA 24mA 24mA 6ns@4.5V~5.5V,50pF 74LVC SOT-23-5 Inverters ROHSTECH PUBLICLogic GatesSN74LVC1G97DBVRE4
SOT-23-6-40℃~+125℃ 1 1.65V~5.5V 10uA 2.4V、3.8V 24mA 24mA 400mV、550mV 6.3ns@3.3V 74LVC Configurable Multi-Function Gate SOT-23-6 Logic Gates ROHSTexas InstrumentsLogic Gates
TCA9535PWR(UMW)
TSSOP-24I/O ExpandersUMW
TPS26600PWPR
HTSSOP-16-EPSurge Protection Devices (SPDs)Texas Instruments
README
README.mdKlink
Klink is a magnetic tile system for building programmable machines. First up: a marble run with sensors, buttons, lights, gates, splitters and an elevator.
V1 requires at least 16 smart tiles and a motorized elevator for continuous circulation. The power budget also targets 24-32 tiles in suitable grids. Each tile is 80 × 80 × 20 mm, with four neighbor connections and two RGB LEDs. A Hub will handle USB, layout discovery and programs that run without a computer.
Rev A uses a 20V bus, with 5V and 3.3V made on each tile. The schematic is in place, but the connectors and protection still need testing. The PCB isn't routed. Disconnect power before moving tiles.
Hardware sources are in hardware/electronics/ and hardware/cad/. Firmware, SDK and Studio are still planned work.
Parts
85| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100nF 50V X7R | Capacitor_SMD:C_0805_2012Metric | C410, C411, C412, C413, C417, C419, C420, C421, C460, C461 |
| 7 | 10k 1% | Resistor_SMD:R_0805_2012Metric | R412, R413, R414, R415, R417, R418, R420 |
| 7 | INA301A1IDGKR | Package_SO:VSSOP-8_3x3mm_P0.65mm | U4, U21, U23, U25, U27, U29, U31 |
| 7 | TPS26630RGER | Package_DFN_QFN:Texas_RGE0024H_VQFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm_ThermalVias | U2, U20, U22, U24, U26, U28, U30 |
| 6 | MountingHole_2.5mm | MountingHole:MountingHole_2.5mm | H1, H2, H3, H4, H5, H6 |
| 3 | TMUX1511PWR | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U74, U75, U76 |
| 2 | 100k 1% | Resistor_SMD:R_0805_2012Metric | R416, R494 |
| 2 | 2.2uF 16V X7R | Capacitor_SMD:C_0805_2012Metric | C415, C416 |
| 2 | 22 1% | Resistor_SMD:R_0805_2012Metric | R492, R493 |
| 2 | 5.1k 1% | Resistor_SMD:R_0805_2012Metric | R490, R491 |
| 2 | SN74LVC244APWR | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U80, U83 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2, SW3 |
| 2 | TPS3808G30DBVR | Package_TO_SOT_SMD:SOT-23-6 | U7, U78 |
| 2 | USB4105-GF-A | Klink:USB_C_Receptacle_GCT_USB4105_RoundedGround | J1, J3 |
| 1 | 1M 1% | Resistor_SMD:R_0805_2012Metric | R495 |
| 1 | 1k 1% | Resistor_SMD:R_0805_2012Metric | R419 |
| 1 | 1uF 16V | Capacitor_SMD:C_0805_2012Metric | C418 |
| 1 | 33 1% | Resistor_SMD:R_0805_2012Metric | R411 |
| 1 | 4.7uF 16V | Capacitor_SMD:C_0805_2012Metric | C414 |
| 1 | 47k 1% | Resistor_SMD:R_0805_2012Metric | R496 |
| 1 | AP2112K-3.3TRG1 | Package_TO_SOT_SMD:SOT-23-5 | U62 |
| 1 | ASE-8.000MHZ-LC-T | Oscillator:Oscillator_SMD_Abracon_ASE-4Pin_3.2x2.5mm | Y70 |
| 1 | BOOT_UART_RX | TestPoint:TestPoint_Pad_D2.0mm | TP41 |
| 1 | BOOT_UART_TX | TestPoint:TestPoint_Pad_D2.0mm | TP40 |
| 1 | BSS138LT1G | Package_TO_SOT_SMD:SOT-23 | Q71 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP42 |
| 1 | HUB_3V3 | TestPoint:TestPoint_Pad_D2.0mm | TP44 |
| 1 | HUB_5V | TestPoint:TestPoint_Pad_D2.0mm | TP43 |
| 1 | LMR36520ADDAR | Package_SO:TI_SO-PowerPAD-8 | U61 |
| 1 | PD_SERVICE | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J2 |
| 1 | SN74LVC1G11DBVR | Package_TO_SOT_SMD:SOT-23-6 | U6 |
| 1 | SN74LVC1G14DBVR | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | SN74LVC1G97DBVR | Package_TO_SOT_SMD:SOT-23-6 | U79 |
| 1 | SRP7050TA-150M | Klink:L_Bourns_SRP7050TA | L60 |
| 1 | STM32F405RGT6 | Package_QFP:LQFP-64_10x10mm_P0.5mm | U70 |
| 1 | STUSB4500QTR | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm | U1 |
| 1 | SWD | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | TCA9535PWR | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U77 |
| 1 | TPS26600PWPR | Klink:TI_PWP0016A_Mask3.3x3.3 | U60 |
| 1 | TPS70933DBVR | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | TS3USB30EDGSR | Package_SO:TSSOP-10_3x3mm_P0.5mm | U72 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U73 |
| 1 | W25Q32JVSSIQ | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U71 |
Questions
How big is the Hub PCB?
It measures 148 × 78 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Hub use?
85 parts, built around the STM32F405RGT6, SN74LVC244APWRE4, INA301A1IDGKR and LMR36520ADDAR. 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 Hub KiCad files?
From the Bruhdows/klink repository on GitHub, at the commit this page was made from: the board is hardware/electronics/hub/hub.kicad_pcb and its schematic hardware/electronics/elevator/elevator.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hub design in my own project?
Its repository states no licence, so its author keeps all rights: ask Bruhdows before reusing the design.
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