2 layers174 × 111 mm
Pedalboard hw
pedalboard/pedalboard-hw
pedalboard audio midi processor open hardware
169 parts14CERN-OHL-P-2.0
4 layers92 × 99.5 mm
Granit
laenzlinger/granit2Custom carrier board for Raspberry Pi CM4/CM5 — minimal offsite backup appliance with JMS578 USB-to-SATA bridge
- Size
- 92 × 99.5 mm
- Copper layers
- 4
- Thickness
- 1.59 mm
- Parts
- 120
- Nets
- 209
- Pads
- 635
- Tracks, vias
- 1,220, 522
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Apr 2026
- Updated
- 23 Oct 2026
Overview
Granit is an open-source printed circuit board by laenzlinger, from the laenzlinger/granit repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 92 × 99.5 mm with 120 parts on 209 nets, routed with 1,220 tracks and 522 vias.
It is built around the ASM1061, 74AHCT1G125SE and 74AHCT1G32GV, with the DS3231MZ/V+, USBLC6-2SC6 and FDS4435BZ among its other parts. Its parts include 46 capacitors, 27 resistors, 7 ICs, 7 connectors and 6 transistors. It belongs with the computers and single-board computers boards and the Raspberry Pi (Linux) boards of this library.
Main components
11ASM1061
QFN-48-EP(7x7)QFN-48-EP(7x7) Microcontrollers (MCU/MPU/SOC) ROHSASMedia TechMicrocontrollers (MCU/MPU/SOC)
74AHCT1G125SE
SOT-353-40℃~+125℃ 1 1 4.5V~5.5V 4.7ns@5V,50pF 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSDiodes IncorporatedBuffers, Drivers, Receivers, Transceivers
74AHCT1G32GV
SOT-23-5L-40℃~+125℃ 1 2 2V 3.7V 4.5V~5.5V 40uA 550mV 74AHCT1G32 8.5ns@5.5V,15pF 800mV OR Gate Overvoltage-tolerant input TTL compatible CMOS SOT-23-5L Logic Gates ROHSMDDLogic Gates
DS3231MZ/V+
SOIC-8-40℃~+85℃ 2.3V~5.5V Built-in I2C Temperature compensation、Backup power management and battery charging、Alarm function、Locking and tamper-proof、Periodic interrupt output SOIC-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
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)FDS4435BZ
SO-8-55℃~+150℃ 1 P-Channel 1.845nF 2.5W 20mΩ@10V 30V 345pF 365pF 3V 40nC@10V 8.8A P-Channel SO-8 MOSFETs ROHSonsemiMOSFETs
BM03B-SRSS-TB
Header SR 1.0 SMT top entry, 1mm pitchJSTUncategorised
CR2032
-- Unclassified goods ROHSMaxellUncategorised
HR911130A
插件0℃~+70℃ 1 Gold Non-PoE Phosphor bronze RJ45 Jack Right Angle Shielded With Cross Pin With LED 插件 Ethernet Connectors / Modular Connectors (RJ45 RJ11) ROHSHANRUNEthernet Connectors / Modular Connectors (RJ45 RJ11)
PCM12SMTR
SMD-20℃~+85℃ 6V PC Pin Rectangular Columnar SPDT Surface Mount,Vertical SMD Slide Switches ROHSC&KSlide Switches
SRN6045TA-3R3Y
SMD,6x6mm21mΩ 3.3uH 5A 7.8A ±30% SMD,6x6mm Power Inductors ROHSBournsPower Inductors
README
README.mdGranit — Offsite Backup Device
Custom carrier board for the Raspberry Pi CM4 Compute Module, designed as a minimal offsite backup appliance.
Overview
A compact, headless device that connects to a remote network and receives encrypted backups onto an attached hard disk. Designed to be left at a trusted offsite location and managed remotely.
- Raspberry Pi CM4 with PCIe SATA (ASM1061)
- 2.5" or 3.5" HDD/SSD support
- Software-controlled HDD power (GPIO)
- RTC wake for scheduled backups
- USB-C OTG for eMMC flashing
- Hammond 1455 aluminium enclosure
Roadmap
- v0.3 — First production run (CM4, 4-layer PCB, JLCPCB)
- v0.4 — Fix wake/shutdown latch (#31), barrel jack swap (#40), DF40C alignment bosses (#37)
- v1.0 — Validated design with custom OS image and documentation
- Future — Investigating RISC-V SoM support for a fully blob-free variant
License
Parts
120| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C2, C10, C11, C12, C13, C14, C15, C16, C18, C19, C21, C22, C23, C24, C28 +8 |
| 15 | 10u | Capacitor_SMD:C_0805_2012Metric | C25, C29, C30, C32, C33, C34, C35, C36, C39, C40, C41, C42, C43, C44, C46 |
| 7 | 10K | Resistor_SMD:R_0805_2012Metric | R6, R11, R16, R17, R18, R19, R20 |
| 5 | 330R | Resistor_SMD:R_0805_2012Metric | R3, R7, R8, R10, R12 |
| 4 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3, FID4 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | 100K | Resistor_SMD:R_0805_2012Metric | R21, R22, R23 |
| 3 | 2N7002 | Package_TO_SOT_SMD:SOT-23 | Q1, Q4, Q5 |
| 3 | FDS4435BZ | granit:SO08-E3 | Q2, Q3, Q6 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1, TP2, TP3 |
| 2 | 10R | Resistor_SMD:R_0805_2012Metric | R13, R27 |
| 2 | 12K | Resistor_SMD:R_0805_2012Metric | R4, R26 |
| 2 | 18p | Capacitor_SMD:C_0805_2012Metric | C17, C20 |
| 2 | 1n | Capacitor_SMD:C_0805_2012Metric | C31, C37 |
| 2 | 4K7 | Resistor_SMD:R_0805_2012Metric | R14, R15 |
| 2 | 5K1 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 750R | Resistor_SMD:R_0805_2012Metric | R5, R9 |
| 1 | 1.2n | Capacitor_SMD:C_0805_2012Metric | C27 |
| 1 | 100u | Capacitor_Tantalum_SMD:CP_EIA-7343-31_Kemet-D | C38 |
| 1 | 100uF/25V | Capacitor_SMD:CP_Elec_6.3x7.7 | C26 |
| 1 | 12V Barrel | granit:BarrelJack_Wuerth_6941xx301002 | J7 |
| 1 | 12V Screw Terminal | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J6 |
| 1 | 12V_bridge | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP3 |
| 1 | 20K | Resistor_SMD:R_0805_2012Metric | R25 |
| 1 | 25MHz | Crystal:Crystal_SMD_2016-4Pin_2.0x1.6mm | Y1 |
| 1 | 2K2 | Resistor_SMD:R_0805_2012Metric | R24 |
| 1 | 3A | Fuse:Fuse_2512_6332Metric | F1 |
| 1 | 3V3_bridge | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | 5V_bridge | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP4 |
| 1 | 74AHCT1G125 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | 74AHCT1G32 | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | AP64501SP-13 | granit:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.71x3.4mm_ThermalVias | U7 |
| 1 | ASM1061 | granit:QFN50P700X700X90-49N-D | U3 |
| 1 | BM03B-SRSS-TB | Connector_JST:JST_SH_BM03B-SRSS-TB_1x03-1MP_P1.00mm_Vertical | J3 |
| 1 | CM4 | granit:Raspberry-Pi-4-Compute-Module | CM1 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_103_1x20mm | BT1 |
| 1 | DS3231MZ | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | HR911130A | granit:HANRUN_HR911130A | J8 |
| 1 | LED G | LED_SMD:LED_0805_2012Metric | D3 |
| 1 | LED R | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | Logo_Open_Hardware_Large | Symbol:OSHW-Logo2_7.3x6mm_SilkScreen | SYM1 |
| 1 | NCP1117-3.3_SOT223 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U6 |
| 1 | PCM12SMTR | Button_Switch_SMD:SW_SPDT_PCM12 | J2 |
| 1 | SATA_12V_PWR | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP6 |
| 1 | SATA_22pin | Connector_SATA_SAS:SATA_Amphenol_10029364-001LF_Horizontal | J4 |
| 1 | SATA_5V_PWR | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP5 |
| 1 | SRN6045TA-3R3Y | Inductor_SMD:L_Bourns_SRN6045TA | L1 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_1P1T-MP_NO_Horizontal_Alps_SKRTLAE010 | SW1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0_14P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | USB_OTG | Jumper:SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP2 |
| 1 | WS2812B-5mm | LED_SMD:LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm | D1 |
Questions
How big is the Granit PCB?
It measures 92 × 99.5 mm and has 4 copper layers, 1.59 mm thick.
What parts does the Granit use?
120 parts, built around the ASM1061, 74AHCT1G125SE, 74AHCT1G32GV and DS3231MZ/V+. 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 Granit KiCad files?
From the laenzlinger/granit repository on GitHub, at the commit this page was made from: the board is hardware/granit.kicad_pcb and its schematic hardware/cm-conn1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Granit 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).
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