Mainboard
About the Mainboard PCB
Mainboard is an open source STM32 PCB design by mkramar, published on GitHub. It is a 4-layer board measuring 45 × 140 mm, with 71 components from 37 distinct parts.
Its main chip is the STM32F031G6U6, from the STM32 family. Other key parts include the LM2678-3.3V, LM2678-12V, ZXTR2012Z, ACS781 and LSM6DS33. By type, the board carries 25 connectors, 13 capacitors, 13 resistors, 8 ICs, 7 diodes and 2 inductors.
Main components on the Mainboard
Mainboard bill of materials (BOM)
71 components, 37 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM2678-3.3V AP1501A-3.3V | TO-263-5_TabPin3 | U1 |
| 1 | LM2678-12V AP1501A-12V | TO-263-5_TabPin3 | U2 |
| 1 | ZXTR2012Z | SOT-89-3 | U3 |
| 1 | ACS781 | ACS781 | U6 |
| 1 | LSM6DS33 | LGA16R50P3X5_300X300X100 | U7 |
| 1 | STM32F031G6U6 STM32F031K6U6 | UFQFPN32-small-pad | U8 |
| 1 | LTC2876 | LTC2876 | U9 |
| 1 | LTC2954 LTC2954-2 | 8-DFN-DDB | U10 |
| 1 | SQM120P04-04L | TO-263-2 | Q1 |
| 1 | Resonator_Small | Oscillator | Y1 |
| 4 | CONN_01X02 | 2x1.5-conn | J1, J2, J8, J9 |
| 3 | CONN_01X02 | 2x2.1-conn | J3, J4, J5 |
| 1 | CONN_02X05 | Pin_Header_Straight_2x05_Pitch1.27mm_SMD | J6 |
| 1 | CONN_02X10 | Pin_Header_Straight_2x10_Pitch2.54mm_SMD | J7 |
| 1 | CONN_01X04 | 4x1.5-conn | J10 |
| 1 | M1 | Hole-m3 | J11 |
| 1 | M2 | Hole-m3 | J12 |
| 1 | M3 | Hole-m3 | J13 |
| 1 | M4 | Hole-m3 | J14 |
| 11 | CONN_01X01 | 0.6x1-conn | J15, J16, J17, J18, J21, J22, J23, J24 +3 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 0.1uF | C_0603 | 0.1 |
| 4 | D_Small | D_SMA | D1, D2, D3, D4 |
| 1 | D_Small | D_SMC | D5 |
| 2 | LED_Small | LED_0603 | D6, D7 |
| 1 | 15UH 15uH | L_10.4x10.4_H4.8 | L1 |
| 1 | 33UH 33uH | L_10.4x10.4_H4.8 | L2 |
| 4 | 20uF 50V | C_1210 | C1, C4, C5, C22 |
| 4 | 20uF | C_1210 | C2, C3, C9, C10 |
| 4 | 100UF 100uF | C_1210 | C12, C13, C28, C29 |
| 1 | 0.33UF 0.33uF | C_0603 | C27 |
| 2 | 47K | R_0603 | R1, R2 |
| 4 | 10K 10k | R_0603 | R4, R15, R16, R21 |
| 3 | 390 | R_0603 | R5, R19, R20 |
| 1 | 1k 1% | R_0603 | R13 |
| 1 | 30K 1% | R_0603 | R14 |
| 1 | 4k | R_0603 | R17 |
| 1 | 6k | R_0603 | R18 |
Mainboard design files
The KiCad project lives in the mkramar/dizzyrobot repository on GitHub; these links point at the commit this page was built from.
Mainboard: common questions
What microcontroller does the Mainboard use?
The Mainboard is built around the STM32F031G6U6, from the STM32 family.
How big is the Mainboard PCB?
The Mainboard measures 45 × 140 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Mainboard?
71 components, from 37 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 Mainboard design files?
From the mkramar/dizzyrobot repository on GitHub, which has the KiCad layout and the BOM; 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 mkramar. 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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STM32Motor
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UpConn
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