Motherboard
About the Motherboard PCB
Motherboard is an open source STM32 PCB design by Brickteam-RO, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 100 mm, with 84 components from 37 distinct parts.
Its main chip is the STM32F103C8T6, from the STM32 family. Other key parts include the CH340C, TPS5420D, AMS1117-3.3, PCA9306DCUR and SN74HC138D. By type, the board carries 27 capacitors, 20 connectors, 19 resistors, 7 ICs, 4 switches and 3 diodes.
From the project
STM32-powered real-time maze generator and solver built for the Robochallenge 2026 - Freestyle Showcase University competition
Main components on the Motherboard
Motherboard bill of materials (BOM)
84 components, 37 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F103C8T6 STM32F103C8Tx | LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | CH340C | SOIC-16_3.9x9.9mm_P1.27mm | U2 |
| 2 | TPS5420D | SOIC-8_3.9x4.9mm_P1.27mm | U3, U4 |
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U5 |
| 1 | PCA9306DCUR PCA9306D | X2SON-8_1.4x1mm_P0.35mm | U6 |
| 1 | SN74HC138D 74HC138 | SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | ABM3C-8.000MHZ-D4Y-T 8MHz | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y1 |
| 1 | ABS07-120-32.768KHZ-T 32.768KHz | Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 1 | 61300311121 BOOT PIN HEADER | PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | 61300411121 ST-Link | PinHeader_1x04_P2.54mm_Horizontal | J2 |
| 1 | TYPE-C-31-M-12 UART_USB | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J3 |
| 1 | 61300411121 I2C_HEADER | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | KPJX-4S-S | KPJX4SS | J5 |
| 1 | 61300511121 SPI_TEST | PinHeader_1x05_P2.54mm_Vertical | J6 |
| 5 | M20-7820646 | HDRV6W70P0X254_1X6_1564X250X850P | J7, J9, J11, J13, J15 |
| 2 | PPTC041LFBN-RC Conn_01x04 | PinSocket_1x04_P2.54mm_Horizontal | J8, J10 |
| 1 | 1729018 Terminal 1 | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J17 |
| 1 | 1729018 Terminal 2 | TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J18 |
| 5 | 1729021 Terminal Block | TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J19, J20, J21, J22, J23 |
| 1 | 61300211121 STM_RST | PinHeader_1x02_P2.54mm_Vertical | SW1 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 61300211121 GEN_MAZE | PinHeader_1x02_P2.54mm_Vertical | SW2 |
| 1 | 61300211121 TOGGLE_MAZE | PinHeader_1x02_P2.54mm_Vertical | SW3 |
| 1 | 61300211121 SOLVE_MAZE | PinHeader_1x02_P2.54mm_Vertical | SW4 |
| 3 | B340-13-F B340 | D_SMC | D1, D2, D3 |
| 2 | SRR1208-221YL 22uH | L_Bourns_SRR1208_12.7x12.7mm | L1, L2 |
| 2 | CC0603JRNPO9BN200 20pF | C_0603_1608Metric | C1, C2 |
| 2 | CC0603JRNPO9BN120 12pF | C_0603_1608Metric | C3, C4 |
| 12 | CC0603KRX7R9BB104 100nF | C_0603_1608Metric | C5, C6, C7, C8, C9, C10, C11, C12 +4 |
| 2 | CC0603KRX7R9BB103 10nF | C_0603_1608Metric | C16, C21 |
| 7 | CL21A106KPFNNNE 10uF | C_0805_2012Metric | C17, C18, C20, C22, C24, C25, C27 |
| 2 | EEE-FK1V221P 220uF | CP_Elec_6.3x5.4 | C19, C23 |
| 3 | RC0603FR-07100KL 100k | R_0603_1608Metric | R1, R17, R18 |
| 7 | RC0603FR-0710KL 10k | R_0603_1608Metric | R2, R3, R4, R5, R6, R10, R11 |
| 6 | RC0603FR-075K1L 5.1k | R_0603_1608Metric | R7, R8, R13, R14, R15, R16 |
| 1 | RC0603FR-0734K8L 34.8k | R_0603_1608Metric | R9 |
| 1 | RC0603FR-0730K9L 30.9k | R_0603_1608Metric | R12 |
| 1 | RC0603FR-070R5L 0.5 | R_0603_1608Metric | R19 |
Motherboard design files
The KiCad project lives in the Brickteam-RO/tilting-maze repository on GitHub; these links point at the commit this page was built from.
Motherboard: common questions
What microcontroller does the Motherboard use?
The Motherboard is built around the STM32F103C8T6, from the STM32 family.
How big is the Motherboard PCB?
The Motherboard measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Motherboard?
84 components, from 37 distinct parts. The full bill of materials is listed on this page.
Where can I download the Motherboard design files?
From the Brickteam-RO/tilting-maze repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Motherboard design in my own project?
Yes, under the terms of its MIT license, which Brickteam-RO chose for the repository.
Can I test firmware for the Motherboard 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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