Main
About the Main PCB
Main is an open source STM32 PCB design by Team-Micras, published on GitHub. It is a 4-layer board measuring 50 × 90 mm, with 138 components from 65 distinct parts.
Its main chip is the STM32H725RGV6, from the STM32 family. Other key parts include the LSM6DSVTR, TSC2020IYST, L6205D013TR, STSPIN958TR and L6981N33DR. By type, the board carries 58 capacitors, 42 resistors, 10 ICs, 7 diodes, 6 transistors and 5 switches.
It belongs with the power & battery, sensors and usb & debug tools designs in this gallery.
From the project
Micras micromouse PCBs as code: Zener circuits, KiCad layouts, CI checks and a design portal
The Micras micromouse main board: a 50 x 90 mm, 4-layer, 1.04 mm board. It carries the STM32H725RGV6 controller, the battery input and power conversion, the two locomotion motor bridges and the fan driver, the IMU, four wall sensors, the slots for the two encoder boards, and the user interface.
The circuit replicates the MicrasMainBoard Altium design part for part: every part keeps its designator, and micras-pcb previous compare main checks the netlist against that design's connectivity (previous/board.json) plus the changes declared in changes.toml.
Main components on the Main
Main bill of materials (BOM)
138 components, 65 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32H725RGV6 STMicroelectronics | QFN-68-1EP_8x8mm_P0.4mm_EP6.5x6.5mm | IC1 |
| 1 | LSM6DSVTR STMicroelectronics | LGA-14_3x2.5mm_P0.5mm | IC2 |
| 2 | TSC2020IYST STMicroelectronics | SOP65P490X110-8N | IC3, IC4 |
| 1 | L6205D013TR STMicroelectronics | SOIC127P1032X265-20N | IC5 |
| 1 | STSPIN958TR STMicroelectronics | QFN50P500X500X100-33N-D | IC6 |
| 1 | L6981N33DR STMicroelectronics | SOIC127P600X175-8N | IC7 |
| 1 | TPS611781RNWR Texas Instruments | RNW0013A | U1 |
| 1 | GT-USB-7010ASV G-Switch | USB-C_G-Switch_GT-USB-7010ASV | U2 |
| 1 | CJA1117B-3.3 JCET | SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR | U3 |
| 3 | B02B-PASK(LF)(SN) JST | JST_PA_B02B-PASK_1x02_P2.00mm_Vertical | M1, M2, M3 |
| 5 | AO3400A Alpha & Omega Semiconductor | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | Q1, Q2, Q3, Q4, Q5 |
| 1 | HSBB3072 HUASHUO | PRPAK-8_L3.0-W3.0-P0.65-BL-EP | Q6 |
| 1 | B02B-PASK(LF)(SN) JST | JST_PA_B02B-PASK_1x02_P2.00mm_Vertical | J1 |
| 1 | PZ254V-11-04P XFCN | PinHeader_1x04_P2.54mm_Vertical_D1.8mm | P1 |
| 1 | FUET-5030 FUET | BUZ-SMD_FST-5030 | BZ1 |
| 1 | KASML010 KUU | Fuse_0402 | F1 |
| 1 | DSHP04TJGER Kangshen | SW-SMD_8P-L6.7-W5.4-P1.27-LS5.6 | SW1 |
| 3 | GT-TC048B-H025-L1 G-Switch | SW-SMD-4P_L4.2-W3.2_GT-TC048 | SW2, SW3, SW5 |
| 1 | MK-12D18-G040 G-Switch | SW-TH_MK-12D18-G040 | SW4 |
| 2 | WS2815C-2020-4P Worldsemi | LED-SMD_4P-L2.2-W2.0-P1.00_WS2815C-2020-4P | D1, D2 |
Show 45 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 1N4148W Hongjiacheng | SOD-123_L2.7-W1.6-LS3.7-FD | D3, D6, D7 |
| 1 | NCD0603Y2 LED YELLOW NationStar | LED_0603_1608Metric | D4 |
| 1 | KT-0603R LED RED KENTO | LED_0603_1608Metric | D5 |
| 1 | AFE201612S2R2MBT 2.2uH 20% 2.7A Magnetsyc | IND-SMD_L2.0-W1.6-B | L1 |
| 1 | XAL6030-102MEB 1uH 20% 23A Coilcraft | XAL6030 | L2 |
| 1 | YSPIA0645-220M 22uH 20% 2.8A YJYCOIN | IND-SMD_L6.5-W6.0 | L3 |
| 4 | CL10A106MA8NRNC 10uF 20% 25V X5R Samsung Electro-Mechanics | C_0603_1608Metric | C1, C3, C4, C52 |
| 2 | CL05A475MP5NRNC 4.7uF 20% 10V X5R Samsung Electro-Mechanics | C_0402_1005Metric | C2, C17 |
| 20 | CL05B104KB54PNC 100nF 10% 50V X7R Samsung Electro-Mechanics | C_0402_1005Metric | C5, C6, C7, C8, C10, C12, C13, C14 +12 |
| 9 | CL05A105KA5NQNC 1uF 10% 25V X5R Samsung Electro-Mechanics | C_0402_1005Metric | C9, C11, C26, C27, C28, C29, C33, C53 +1 |
| 2 | 0402CG180J500NT 18pF 5% 50V C0G Fenghua | C_0402_1005Metric | C22, C23 |
| 3 | CL05B103KB5NNNC 10nF 10% 50V X7R Samsung Electro-Mechanics | C_0402_1005Metric | C30, C40, C41 |
| 1 | CL05B224KO5NNNC 220nF 10% 16V X7R Samsung Electro-Mechanics | C_0402_1005Metric | C31 |
| 2 | CL10B474KA8NNNC 470nF 10% 25V X7R Samsung Electro-Mechanics | C_0603_1608Metric | C34, C35 |
| 1 | VT1C221M0605 220uF 20% 16V ACMECON | CAP-SMD_BD6.3-L6.6-W6.6-LS7.3-FD | C36 |
| 1 | JVS25V100M6X4 100uF 20% 25V JIERR | CAP-SMD_BD6.3-L6.6-W6.6-LS7.3-FD_JVS25V100M6X4 | C37 |
| 1 | CL21B224KBFNNNE 220nF 10% 50V X7R Samsung Electro-Mechanics | C_0805_2012Metric | C39 |
| 1 | 0402B471K500NT 470pF 10% 50V X7R Fenghua | C_0402_1005Metric | C42 |
| 1 | CL10B224KA8NNNC 220nF 10% 25V X7R Samsung Electro-Mechanics | C_0603_1608Metric | C43 |
| 2 | GRM21BR61H106KE43L 10uF 10% 50V X5R Murata | C_0805_2012Metric | C44, C45 |
| 2 | C2012X5R1V226MT000E 22uF 20% 35V X5R TDK | C_0805_2012Metric | C46, C47 |
| 1 | CL21A475KAQNNNE 4.7uF 10% 25V X5R Samsung Electro-Mechanics | C_0805_2012Metric | C48 |
| 4 | CL21A226MAQNNNE 22uF 20% 25V X5R Samsung Electro-Mechanics | C_0805_2012Metric | C49, C50, C51, C57 |
| 1 | GRM31CR60J227ME11L 220uF 20% 6.3V X5R Murata | C_1206_3216Metric | C56 |
| 5 | 0402WGF2200TCE 220 1% UNI-ROYAL | R_0402_1005Metric | R1, R11, R15, R19, R23 |
| 6 | 0402WGF1002TCE 10k 1% UNI-ROYAL | R_0402_1005Metric | R2, R12, R16, R20, R24, R42 |
| 5 | 0603WAF100JT5E 10 1% 100mW UNI-ROYAL | R_0603_1608Metric | R3, R13, R17, R21, R25 |
| 2 | 0402WGF6800TCE 680 1% UNI-ROYAL | R_0402_1005Metric | R4, R5 |
| 2 | 0402WGF5101TCE 5.1k 1% UNI-ROYAL | R_0402_1005Metric | R6, R7 |
| 2 | 0402WGF330JTCE 33 1% UNI-ROYAL | R_0402_1005Metric | R8, R9 |
| 1 | 0402WGF1501TCE 1.5k 1% UNI-ROYAL | R_0402_1005Metric | R10 |
| 4 | 0402WGF1001TCE 1k 1% UNI-ROYAL | R_0402_1005Metric | R14, R18, R22, R26 |
| 1 | 0402WGF3902TCE 39k 1% UNI-ROYAL | R_0402_1005Metric | R27 |
| 1 | 0402WGF2402TCE 24k 1% UNI-ROYAL | R_0402_1005Metric | R28 |
| 1 | 0402WGF7502TCE 75k 1% UNI-ROYAL | R_0402_1005Metric | R29 |
| 1 | 0402WGF5601TCE 5.6k 1% UNI-ROYAL | R_0402_1005Metric | R30 |
| 1 | HoLLR2512-3W-50mR-1% 50m 1% 3W Milliohm | R_2512_6332Metric | R31 |
| 2 | LR2512-22R040F4 40m 1% 2W RALEC | R_2512_6332Metric | R32, R33 |
| 1 | 0402WGF1000TCE 100 1% UNI-ROYAL | R_0402_1005Metric | R34 |
| 2 | 0402WGF1003TCE 100k 1% UNI-ROYAL | R_0402_1005Metric | R35, R41 |
| 1 | 0402WGF1503TCE 150k 1% UNI-ROYAL | R_0402_1005Metric | R36 |
| 1 | 0402WGF5602TCE 56k 1% UNI-ROYAL | R_0402_1005Metric | R37 |
| 1 | 0402WGF6802TCE 68k 1% UNI-ROYAL | R_0402_1005Metric | R38 |
| 1 | 0603WAF2004T5E 2M 1% 100mW UNI-ROYAL | R_0603_1608Metric | R39 |
| 1 | 0603WAF1303T5E 130k 1% 100mW UNI-ROYAL | R_0603_1608Metric | R40 |
Main design files
The KiCad project lives in the Team-Micras/MicrasPCB repository on GitHub; these links point at the commit this page was built from.
Main: common questions
What microcontroller does the Main use?
The Main is built around the STM32H725RGV6, from the STM32 family.
How big is the Main PCB?
The Main measures 50 × 90 mm, has 4 copper layers and is 1.0412 mm thick.
How many components are on the Main?
138 components, from 65 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 Main design files?
From the Team-Micras/MicrasPCB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Main design in my own project?
The repository has no license, so all rights stay with Team-Micras. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Main 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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