Main
About the Main PCB
Main is an open source STM32 PCB design by Tomoshibi-technology, published on GitHub under the MIT license. It is a 2-layer board measuring 110 × 120 mm, with 200 components from 74 distinct parts.
Its main chip is the STM32F446RETX, from the STM32 family. Other key parts include the CH340E, 74LVC1G32, AZ1084CD-3.3, NJU72501_MODULE and MAX3485. By type, the board carries 70 resistors, 36 capacitors, 25 transistors, 16 connectors, 16 diodes and 14 switches.
From the project
燈のプロダクト達を動かしている基板開発用リポジトリ
Main components on the Main
Main bill of materials (BOM)
200 components, 74 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH340E | MSOP-10_3x3mm_P0.5mm | U1 |
| 1 | CH340E | MSOP-10_3x3mm_P0.5mm | U2 |
| 1 | 74LVC1G32 LF50_TO220 | BP5293 | U3 |
| 1 | AZ1084CD-3.3 LF50_TO220 | BP5293 | U4 |
| 1 | STM32F446RETX AMS1117CD-3.3 | TO-252-3_TabPin2 | U5 |
| 1 | NJU72501_MODULE TWE-L-WX | MonoWireless_TWE-L-WX | U6 |
| 1 | STM32F446RETx | LQFP-64_10x10mm_P0.5mm | U7 |
| 1 | MAX3485 BNO055 | BNO055 | U8 |
| 1 | MAX3485 | SOP-8_3.9x4.9mm_P1.27mm | U9 |
| 1 | DFR0299 | MODULE_DFR0299 | U10 |
| 9 | PMN48XP | SSM6J808R | Q1, Q4, Q8, Q9, Q11, Q17, Q18, Q19 +1 |
| 2 | SSM6J808R Q_NMOS_GSD | SOT-23_Handsoldering | Q2, Q6 |
| 3 | C2844873 PMN48XP | SSM6J808R | Q3, Q5, Q20 |
| 3 | Q_PNP_BEC | SC-59_Handsoldering | Q7, Q10, Q14 |
| 2 | Q_NMOS_GSD | SOT-23_Handsoldering | Q12, Q24 |
| 3 | Q_PMOS_GSD | SOT-23_Handsoldering | Q13, Q15, Q16 |
| 3 | C2844873 Q_NMOS_GSD | SOT-23_Handsoldering | Q21, Q22, Q23 |
| 1 | CONN_01X07_FEMALE Conn_01x02_Female | AMASS_XT30PW-M_1x02_P2.50mm_Horizontal | J1 |
| 1 | CONN_01X02_FEMALE Conn_01x06_Female | Molex_PicoBlade_53261-0671_1x06-1MP_P1.25mm_Horizontal | J2 |
| 2 | CONN_01X02_FEMALE USB_C_Receptacle_USB2.0 | USB_C(simple) | J3, J5 |
Show 54 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CONN_01X02_FEMALE Conn_01x07_Female | PinSocket_1x07_P2.54mm_Horizontal | J4 |
| 1 | USB_C_RECEPTACLE_USB2.0 Conn_01x10_Female | IDC-Header_2x05_P2.54mm_Horizontal | J6 |
| 1 | CONN_01X10_FEMALE Conn_01x05_Female | Molex_PicoBlade_53261-0571_1x05-1MP_P1.25mm_Horizontal | J7 |
| 3 | CONN_01X03_FEMALE Conn_01x05_Female | Molex_PicoBlade_53261-0571_1x05-1MP_P1.25mm_Horizontal | J8, J9, J10 |
| 1 | CONN_01X03_FEMALE Conn_01x09_Female | Molex_PicoBlade_53261-0971_1x09-1MP_P1.25mm_Horizontal | J11 |
| 1 | Conn_01x10_Female | Molex_PicoBlade_53261-1071_1x10-1MP_P1.25mm_Horizontal | J12 |
| 3 | Conn_01x03_Female | Molex_PicoBlade_53261-0371_1x03-1MP_P1.25mm_Horizontal | J13, J14, J15 |
| 1 | CONN_01X03_FEMALE Conn_01x03_Female | Molex_PicoBlade_53261-0371_1x03-1MP_P1.25mm_Horizontal | J16 |
| 3 | MountingHole_Pad | TestPoint_THTPad_2.5x2.5mm_Drill1.2mm | H3, H4, H5 |
| 1 | JUMPER_2_OPEN Jumper_3_Open | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 3 | Jumper_3_Open | PinHeader_1x03_P2.54mm_Vertical | JP2, JP3, JP4 |
| 1 | Jumper_2_Open | PinHeader_1x02_P2.54mm_Vertical | JP5 |
| 4 | Jumper_2_Open | SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP6, JP7, JP8, JP9 |
| 1 | Speaker_Crystal | Buzzer_12x9.5RM7.6 | LS1 |
| 1 | SW_DPDT_X2 SW_SPDT | 3P_SPDT_5Pin_ToggleSwitch | SW1 |
| 4 | SW_SPDT | 3P_SPDT_SlideSwitch | SW2, SW6, SW9, SW10 |
| 4 | SW_SPST | SW_SPST_Omron_B3FS-100xP | SW3, SW7, SW8, SW11 |
| 2 | SW_DIP_X02 SW_SPDT | 3P_SPDT_SlideSwitch | SW4, SW14 |
| 1 | SW_DPDT_X2 SW_DIP_x04 | DIP-8_W7.62mm | SW5 |
| 1 | SW_DIP_x04 | DIP-8_W7.62mm | SW12 |
| 1 | SW_DIP_X04 SW_DPDT_x2 | SW_CuK_JS202011CQN_DPDT_Straight | SW13 |
| 3 | D | D_SOD-123 | D1, D5, D7 |
| 12 | LED | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2, D3, D6, D8, D9, D10, D11, D12 +4 |
| 1 | MA10EB045 D | D_SOD-123 | D4 |
| 1 | 0.1UF 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 2 | 10UF 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C10 |
| 9 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C18, C19, C20, C31, C32, C33 +1 |
| 2 | 0.1UF 470uF | C_Elec_8x10.2 | C5, C16 |
| 1 | 4.7UF 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 2 | 4.7UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C7, C24 |
| 3 | 1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C8, C25, C30 |
| 1 | 22UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9 |
| 1 | 0.1UF 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 4 | 0.1UF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C12, C21, C22, C35 |
| 2 | 1UF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C13, C17 |
| 3 | 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C14, C23, C36 |
| 1 | 0.1UF ADJ_ST | C_Disc_D5.0mm_W2.5mm_P5.00mm | C15 |
| 1 | 470UF 4.7uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C26 |
| 1 | 470UF 1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C27 |
| 2 | 470UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C28, C29 |
| 24 | 10K 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R3, R9, R14, R19, R22, R23, R29 +16 |
| 4 | 10K 5.1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R4, R10, R11 |
| 2 | 5.1K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R6 |
| 1 | R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
| 3 | 10K R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R41, R42 |
| 10 | 10K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12, R32, R33, R34, R35, R36, R39, R40 +2 |
| 18 | 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R15, R16, R18, R20, R21, R25, R27 +10 |
| 1 | 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R17 |
| 1 | 100K 1k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R24 |
| 1 | 330 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R26 |
| 1 | 10K 7.5k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R51 |
| 1 | 20k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R52 |
| 2 | 2.2k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R57, R58 |
| 1 | 10K 120 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R59 |
Main design files
The KiCad project lives in the Tomoshibi-technology/Tomoshibi_Circuit 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 STM32F446RETX, from the STM32 family.
How big is the Main PCB?
The Main measures 110 × 120 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main?
200 components, from 74 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 Tomoshibi-technology/Tomoshibi_Circuit 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?
Yes, under the terms of its MIT license, which Tomoshibi-technology chose for the repository.
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.
More boards in Tomoshibi_Circuit
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150 × 150 mm224 parts2LMIT0
STM32Common Control
110 × 120 mm219 parts2LMIT0
STM32BLDC Ver1
131.6 × 167 mm165 parts2LMIT0
STM32Motordriver
125 × 70 mm131 parts2LMIT0
STM32MD
147 × 57 mm126 parts2LMIT0
Power
110 × 120 mm91 parts2LMIT0
Control
35 × 35 mm68 parts4LMIT0
Ver1
65.3 × 52.7 mm42 parts2LMIT0
Odometry
72 × 47 mm41 parts2LMIT0
StepDown
55 × 58 mm20 parts2LMIT0
Line board
72 × 47 mm13 parts2LMIT0
Earlier revisions in the repo: Main
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