Square
About the Square PCB
Square is an open source STM32 PCB design by sparkerBCI, published on GitHub. It is a 2-layer board measuring 78 × 72 mm, with 113 components from 45 distinct parts.
Its main chip is the STM32F407VGTX, from the STM32 family. Other key parts include the LDL1117S33R, MCP1755T-5002E_SOT223-5 and FT232RL. By type, the board carries 60 capacitors, 27 resistors, 10 connectors, 6 diodes, 4 ICs and 3 switches.
From the project
Brain Computer Interface 3-D Printed Prosthetic Hand
This is an Electrical Engineering Final Year Project by Samuel Parker, from the University of Newcastle.
Main components on the Square
Square bill of materials (BOM)
113 components, 45 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LDL1117S33R | SOT-223-3_TabPin2 | U1 |
| 1 | STM32F407VGTX STM32F407VGTx | LQFP-100_14x14mm_P0.5mm | U2 |
| 1 | MCP1755T-5002E_SOT223-5 | SOT-223-6 | U3 |
| 1 | FT232RL | SSOP-28_5.3x10.2mm_P0.65mm | U4 |
| 1 | SQ3425EV-T1_GE3 | TSOT-23-6 | Q1 |
| 1 | 8MHZ 12MHz | CSTNE12M0GH5L000R0 | Y1 |
| 1 | SWD Header | PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | Barrel_Jack | BarrelJack_CUI_PJ-063AH_Horizontal | J2 |
| 1 | Thumb | PinHeader_1x03_P2.54mm_Horizontal | J3 |
| 1 | Index | PinHeader_1x03_P2.54mm_Horizontal | J4 |
| 1 | Middle | PinHeader_1x03_P2.54mm_Horizontal | J5 |
| 1 | Ring | PinHeader_1x03_P2.54mm_Horizontal | J6 |
| 1 | Pinky | PinHeader_1x03_P2.54mm_Horizontal | J7 |
| 1 | Wrist | PinHeader_1x03_P2.54mm_Horizontal | J8 |
| 1 | HC05 | HC-05 | J9 |
| 1 | USB_B_Mini | USB_Micro-B_Wuerth_629105150521 | J10 |
| 1 | Fuse | R_Axial_Power_L20.0mm_W6.4mm_P25.40mm | F1 |
| 1 | SW_Push | 1825910-6 | SW1 |
| 1 | SW_DIP_X02 SW_DIP_x02 | DIP-Switch_01x02 | SW2 |
| 1 | BT Enable | DIP-Switch_01x02 | SW3 |
Show 25 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LTST-C171TGKT LTST-C171TBKT | LED_0805_2012Metric | D1 |
| 1 | LO R976-PS-1 | LED_0805_2012Metric | D2 |
| 1 | 10V | D_SMA | D3 |
| 2 | LED | LED_0603_1608Metric | D4, D5 |
| 1 | LTST-C171TGKT LED | LED_0603_1608Metric | D6 |
| 2 | 100u | CP_Elec_6.3x7.7 | C1, C54 |
| 12 | 100N 100n | C_0603_1608Metric | C2, C9, C16, C21, C26, C30, C35, C39 +4 |
| 7 | 100n | C_0603_1608Metric | C3, C10, C17, C22, C27, C31, C36 |
| 15 | 10N 10n | C_0603_1608Metric | C4, C11, C18, C20, C23, C28, C32, C34 +7 |
| 7 | 10n | C_0603_1608Metric | C5, C12, C19, C24, C29, C33, C38 |
| 3 | 10u | CP_Elec_4x5.4 | C7, C48, C56 |
| 1 | 0.1U 0.1u | C_0603_1608Metric | C13 |
| 5 | 4.7U 4.7u | C_0603_1608Metric | C15, C47, C57, C60, C68 |
| 2 | 1n | C_0603_1608Metric | C25, C40 |
| 2 | 1u | C_0603_1608Metric | C41, C50 |
| 2 | 2.2U 2.2u | C_0603_1608Metric | C49, C51 |
| 1 | 100U 100u | CP_Elec_6.3x7.7 | C53 |
| 1 | 10U 10u | CP_Elec_4x5.4 | C55 |
| 9 | 100K 100k | R_0603_1608Metric | R1, R2, R13, R15, R17, R19, R21, R23 +1 |
| 1 | 68R 65R | R_0603_1608Metric | R4 |
| 1 | 33K 33k | R_0603_1608Metric | R5 |
| 6 | 50M 50m | R_0603_1608Metric | R6, R7, R8, R9, R10, R11 |
| 7 | 500K 500k | R_0603_1608Metric | R12, R14, R16, R18, R20, R22, R24 |
| 2 | 150 | R_0603_1608Metric | R26, R27 |
| 1 | 150 | R_0603_1608Metric | R28 |
Square design files
The KiCad project lives in the sparkerBCI/FYP repository on GitHub; these links point at the commit this page was built from.
Square: common questions
What microcontroller does the Square use?
The Square is built around the STM32F407VGTX, from the STM32 family.
How big is the Square PCB?
The Square measures 78 × 72 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Square?
113 components, from 45 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 Square design files?
From the sparkerBCI/FYP repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Square design in my own project?
The repository has no license, so all rights stay with sparkerBCI. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Square 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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