2026B-main
About the 2026B-main PCB
2026B-main is an open source STM32 PCB design by mememan5868, published on GitHub. It is a 2-layer board measuring 96.8 × 65 mm, with 47 components from 28 distinct parts.
Its main chip is the STM32F446RETX, from the STM32 family. Other key parts include the MCP2561-E-SN and NJM2845DL1-33-TE1. By type, the board carries 23 connectors, 10 resistors, 6 capacitors, 4 ICs, 2 diodes and 1 crystal.
Main components on the 2026B-main
2026B-main bill of materials (BOM)
47 components, 28 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32F446RETX STM32F446RETx | LQFP-64_10x10mm_P0.5mm | U1 |
| 2 | MCP2561-E-SN | SOIC-8_3.9x4.9mm_P1.27mm | U3, U4 |
| 1 | NJM2845DL1-33-TE1 | DPAK228P968X238-4N | U5 |
| 1 | Crystal | XTAL_TSX-3225_25.0000MF10P-C0 | Y1 |
| 1 | USB_B_Mini | USB_Mini-B_Lumberg_2486_01_Horizontal | J1 |
| 1 | SWD | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 4 | CONN_01X02 Conn_01x02 | JST_XH_S2B-XH-A_1x02_P2.50mm_Horizontal | J3, J4, J5, J6 |
| 4 | CONN_01X04 Conn_01x04 | JST_XH_S4B-XH-A_1x04_P2.50mm_Horizontal | J15, J16, J17, J18 |
| 1 | SBUS | JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J19 |
| 1 | LIM1_CONN Lim1_Conn | JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | J20 |
| 1 | LIM2_CONN Lim2_Conn | JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | J21 |
| 1 | LIM3_CONN Lim3_Conn | JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | J22 |
| 1 | LIM4_CONN Lim4_Conn | JST_XH_B2B-XH-AM_1x02_P2.50mm_Vertical | J23 |
| 2 | ENC1 Enc1 | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J28, J30 |
| 2 | ENC2 Enc2 | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J29, J31 |
| 1 | MOTOR1 Motor1 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J32 |
| 1 | MOTOR2 Motor2 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J33 |
| 1 | MOTOR3 Motor3 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J34 |
| 1 | MOTOR4 Motor4 | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J35 |
| 1 | SW_MEC_5E | SW4_SKRPABE010_ALPS | SW1 |
Show 8 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CAN1_STATE CAN1_State | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | CAN2_STATE CAN2_State | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 2 | 0.1UF 0.1uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C4 |
| 2 | 4.7UF 4.7uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C3 |
| 2 | 20PF 20pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5, C6 |
| 6 | 10K 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R5, R6, R7, R8 |
| 2 | 120 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4 |
| 2 | 470 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R14 |
2026B-main design files
The KiCad project lives in the mememan5868/2026-NroboB repository on GitHub; these links point at the commit this page was built from.
2026B-main: common questions
What microcontroller does the 2026B-main use?
The 2026B-main is built around the STM32F446RETX, from the STM32 family.
How big is the 2026B-main PCB?
The 2026B-main measures 96.8 × 65 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 2026B-main?
47 components, from 28 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 2026B-main design files?
From the mememan5868/2026-NroboB 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 2026B-main design in my own project?
The repository has no license, so all rights stay with mememan5868. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the 2026B-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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