Default
About the Default PCB
Default is an open source STM32 PCB design by RileyLeff, published on GitHub. It is a 6-layer board measuring 100 × 65 mm, with 234 components from 54 distinct parts.
Its main chip is the STM32G0B1CBT6, from the STM32 family. Other key parts include the 74HC4067PW,118, LM5165YDRCR, ADS1115IDGSR, SP3485EN-L/TR and 2920L110/60MR. By type, the board carries 91 capacitors, 87 resistors, 20 diodes, 13 ICs, 7 transistors and 6 connectors.
It belongs with the sensors designs in this gallery.
From the project
This directory freezes the fabrication package for the physical boards ordered from JLCPCB in March 2026.
This directory freezes the fabrication package for the physical boards ordered from JLCPCB in March 2026.
- Hardware status: fabricated and delivered. - Canonical design source: ../../elec/main.ato and the supporting Atopile modules in ../../elec/. - Canonical handcrafted layout: ../../elec/layouts/default/default.kicadpcb`. - Canonical fabrication package: the Gerbers, drill file, JLCPCB BOM, and JLCPCB CPL in this directory.
Main components on the Default
Default bill of materials (BOM)
234 components, 54 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74HC4067PW,118 Nexperia | TSSOP-24_L7.8-W4.4-P0.65-LS6.4-BL | U1, U5, U11 |
| 1 | LM5165YDRCR Texas Instruments | VSON-10_L3.0-W3.0-P0.50-TL-EP | U2 |
| 1 | STM32G0B1CBT6 STMicroelectronics | LQFP-48_L7.0-W7.0-P0.50-LS9.0-BL | U3 |
| 1 | ADS1115IDGSR Texas Instruments | MSOP-10_L3.0-W3.0-P0.50-LS5.0-BL | U4 |
| 1 | SP3485EN-L/TR SP3485EN-L MaxLinear | SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL | U6 |
| 1 | 2920L110/60MR Littelfuse | F2920 | U7 |
| 1 | TPL5010DDCR Texas Instruments | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | U8 |
| 1 | CAT24C32WI-GT3 onsemi | SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL | U9 |
| 1 | XL-B1212RGBA-HF XINGLIGHT | LED-SMD_4P-L1.2-W1.2_BR | U10 |
| 1 | VP1H101M0607 Honor Elec | CAP-SMD_BD6.3-L6.6-W6.6-LS7.2-FD | U12 |
| 1 | W25Q256JVFIQ Winbond Elec | SOIC-16_L10.3-W7.5-P1.27-LS10.3-BL | U13 |
| 1 | TM15N10D Tritech-MOS | TO-252-2_L6.6-W6.2-P4.57-LS10.1-BR-CW | Q1 |
| 1 | SS8550 Y2(RANGE:200-350) C8542 Changjiang Electronics Tech | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q2 |
| 1 | MMBT3904(RANGE:100-300) Changjiang Electronics Tech | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q3 |
| 4 | 2N7002 Changjiang Electronics Tech | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q4, Q5, Q6, Q7 |
| 1 | Q13FC13500004 Seiko Epson | FC-135R_L3.2-W1.5 | Y1 |
| 2 | KF2EDGV-3.5-2P Cixi Kefa Elec | CONN-TH_P3.50_KF2EDGV-3.5-2P | CN1, J1 |
| 1 | X6521WV-2x30H-C60D30 X6521WV-2X30H-C60D30 XKB Connectivity | HDR-TH_60P-P2.54-V-M-R2-C30-S2.54 | CN2 |
| 1 | 2.54-1x6P直针 BOOMELE | HDR-TH_6P-P2.54-V-M-1 | J2 |
| 1 | KF2EDGV-3.5-3P Cixi Kefa Elec | CONN-TH_3P-P3.50_KF2EDGV-3.5-3P | J3 |
Show 34 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PZ254V-11-04P XFCN | HDR-TH_4P-P2.54-V-M | J4 |
| 1 | BS-CR2032-8 Lian Xin Technology | BAT-SMD_BS-CR2032-8 | BAT1 |
| 2 | 5x20 环保 保险管夹/座 C3130 Xucheng Elec | FUSE-TH_5X20RHOSFUSECLIP-SEAT | F1, F2 |
| 3 | ToolingHole | ToolingHole_1.152mm | TH1, TH2, TH3 |
| 13 | PRTR5V0U4D-TP TECH PUBLIC | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | D1, D3, D4, D8, D9, D10, D11, D12 +5 |
| 1 | SMAJ33A FTR | SMA_L4.3-W2.6-LS5.0-RD | D2 |
| 1 | SM712 hongjiacheng | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | D5 |
| 1 | SS36 MDD（Microdiode Electronics） | SMA_L4.3-W2.6-LS5.2-RD | D6 |
| 1 | 1N4148WS Changjiang Electronics Tech | SOD-323_L1.8-W1.3-LS2.5-RD | D7 |
| 1 | SS56 hongjiacheng | SMA_L4.3-W2.6-LS5.0-RD | D18 |
| 1 | MM3Z10 hongjiacheng | SOD-323_L1.7-W1.3-LS2.6-RD | D19 |
| 1 | BAT54S hongjiacheng | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | D20 |
| 1 | XRNR4018-68uH/M XRNR4018-68UH/M XR | IND-SMD_L4.0-W4.0 | L1 |
| 2 | GZ1608D601TF Sunlord | L0603 | L2, L3 |
| 1 | 1206B475K500NT FH | C1206 | C1 |
| 78 | CC0603KRX7R9BB104 YAGEO | C0603 | C2, C5, C6, C8, C9, C10, C12, C13 +70 |
| 1 | C2012X5R1A226KT000N TDK | C0805 | C3 |
| 5 | CL10A105KB8NNNC Samsung Electro-Mechanics | C0603 | C4, C20, C28, C86, C88 |
| 2 | GRM21BR61H106KE43L Murata Electronics | C0805 | C7, C91 |
| 2 | CL05B104KO5NNNC 0F Samsung Electro-Mechanics | C0402 | C11, C22 |
| 2 | 0402CG180J500NT FH | C0402 | C89, C90 |
| 1 | 0603WAF5602T5E 56000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R1 |
| 10 | 0603WAF1002T5E 10000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R2, R21, R26, R33, R74, R75, R76, R79 +2 |
| 3 | 0402WGF1002TCE 10000Ω UNI-ROYAL(Uniroyal Elec) | R0402 | R3, R4, R5 |
| 53 | 0603WAF1001T5E 1000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R6, R7, R8, R9, R10, R11, R12, R13 +45 |
| 1 | FRC0603F2700TS 270Ω FOJAN | R0603 | R16 |
| 8 | 0603WAF1003T5E 100000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R17, R18, R23, R27, R28, R29, R81, R87 |
| 1 | 0603WAF1200T5E 120Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R19 |
| 1 | 0603WAF1102T5E 11000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R22 |
| 5 | 0603WAF1004T5E 1000000Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R25, R34, R83, R84, R86 |
| 1 | 0603WAF2200T5E 220Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R30 |
| 1 | 0603WAF2000T5E 200Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R31 |
| 1 | 0603WAF6800T5E 680Ω UNI-ROYAL(Uniroyal Elec) | R0603 | R32 |
| 1 | 0603WAF4704T5E UNI-ROYAL | R0603 | R80 |
Default design files
The KiCad project lives in the RileyLeff/sapflux_sensor repository on GitHub; these links point at the commit this page was built from.
Default: common questions
What microcontroller does the Default use?
The Default is built around the STM32G0B1CBT6, from the STM32 family.
How big is the Default PCB?
The Default measures 100 × 65 mm, has 6 copper layers and is 1.4204 mm thick.
How many components are on the Default?
234 components, from 54 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Default design files?
From the RileyLeff/sapflux_sensor repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Default design in my own project?
The repository has no license, so all rights stay with RileyLeff. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Default without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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