Mainboard
About the Mainboard PCB
Mainboard is an open source STM32 PCB design by evolutek, published on GitHub. It is a 2-layer board measuring 115 × 70 mm, with 116 components from 52 distinct parts.
Its main chip is the STM32G491KEUx, from the STM32 family. Other key parts include the SN74LVTH125, NCP718xSN330, MCP2551-I-SN, WE-TVS-82400102 and SN74LVC1G32. By type, the board carries 36 resistors, 27 capacitors, 17 diodes, 14 connectors, 9 ICs and 5 transistors.
Main components on the Mainboard
Mainboard bill of materials (BOM)
116 components, 52 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | SN74LVTH125 | TSSOP-14_4.4x5mm_P0.65mm | U1, U2, U3 |
| 1 | NCP718xSN330 | SOT-23-5 | U4 |
| 1 | MCP2551-I-SN | SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | WE-TVS-82400102 | SOT-23-6 | U6 |
| 1 | STM32G491KEUx | QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm-Without thermal pad | U7 |
| 1 | SN74LVC1G32 | SOT-23-5 | U8 |
| 1 | SN74LVC1G11 | SOT-23-6 | U9 |
| 2 | Q_PMOS_GDS | TO-263-2 | Q1, Q3 |
| 1 | Q_NMOS_GSD 60V | SOT-23 | Q2 |
| 2 | NMOS | SOT-23 | Q4, Q5 |
| 1 | BATT | 657002140101 | J1 |
| 1 | Computer Interface | J_Wurth_WR-MM_690367281276 | J2 |
| 1 | USB_C_Receptacle_PowerOnly_6P | GCT_USB4125-GF-A_REVA2 | J3 |
| 2 | Bus EVO | 690367281076 | J4, J10 |
| 1 | Hoop Interface Front | 66201021022 | J5 |
| 1 | Hoop Interface Back | 66201021022 | J6 |
| 2 | MOTORS | 657002140101 | J7, J11 |
| 1 | AUX | 657002140101 | J8 |
| 1 | UI Interface | 690367281476 | J9 |
| 1 | USB_C_Receptacle_USB2.0_16P | 629722000214 | J12 |
Show 32 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STLINK | 62701420621 | J13 |
| 1 | I2C | B04B-PASK | J14 |
| 1 | 50A | FUSE_3557-2 | F1 |
| 3 | Jumper_2_Small_Open | PinHeader_1x02_P2.54mm_Vertical | JP1, JP2, JP4 |
| 1 | TEN_40-4812WIE | TRACO_CONV_TEN | PS1 |
| 1 | THL_20-2411WI | TRACO_CONV_THL | PS2 |
| 1 | 435431019840 | 435431019840 | SW1 |
| 1 | SW_DIP_x01 | SW_DIP_SPSTx01_Slide_6.7x4.1mm_W7.62mm_P2.54mm_LowProfile | SW2 |
| 3 | 60V | DO-214AB | D1, D3, D5 |
| 2 | 15V | D_SOD-523 | D2, D4 |
| 6 | 3V | D_SOD-523 | D6, D7, D8, D10, D11, D15 |
| 2 | RED | LED_0805_2012Metric | D9, D12 |
| 3 | YELLOW | LED_0805_2012Metric | D13, D14, D16 |
| 1 | GREEN | LED_0805_2012Metric | D17 |
| 1 | 22nF | C_0603_1608Metric | C1 |
| 12 | 100nF | C_0603_1608Metric | C2, C3, C8, C14, C15, C16, C19, C20 +4 |
| 1 | 180uF | CP_Radial_D10.0mm_P5.00mm | C4 |
| 4 | 1uF | C_0603_1608Metric | C5, C10, C17, C18 |
| 2 | 470uF | CP_Radial_D12.5mm_P5.00mm | C6, C12 |
| 1 | 1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 1 | 100uF | CP_Elec_6.3x7.7 | C9 |
| 3 | 10uF | C_0603_1608Metric | C11, C22, C27 |
| 1 | 22uF | CP_Radial_D10.0mm_P5.00mm | C13 |
| 1 | 10nF | C_0603_1608Metric | C26 |
| 15 | 10k | R_0603_1608Metric | R1, R2, R5, R6, R7, R8, R10, R11 +7 |
| 7 | 33k | R_0603_1608Metric | R3, R9, R16, R17, R18, R19, R20 |
| 2 | 22k | R_0603_1608Metric | R4, R15 |
| 6 | 510 | R_0603_1608Metric | R23, R30, R32, R33, R34, R36 |
| 1 | 120 | R_0603_1608Metric | R24 |
| 2 | 5.1k | R_0603_1608Metric | R26, R27 |
| 1 | 0 | R_0603_1608Metric | R28 |
| 2 | 4.7k | R_0603_1608Metric | R35, R37 |
Mainboard design files
The KiCad project lives in the evolutek/cartolutek-hardware repository on GitHub; these links point at the commit this page was built from.
- LayoutMainboard/Mainboard.kicad_pcb
- SchematicMainboard/Mainboard.kicad_sch
Mainboard: common questions
What microcontroller does the Mainboard use?
The Mainboard is built around the STM32G491KEUx, from the STM32 family.
How big is the Mainboard PCB?
The Mainboard measures 115 × 70 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mainboard?
116 components, from 52 distinct parts. The full bill of materials is listed on this page.
Where can I download the Mainboard design files?
From the evolutek/cartolutek-hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Mainboard design in my own project?
The repository has no license, so all rights stay with evolutek. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Mainboard 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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