Buddy
About the Buddy PCB
Buddy is an open source STM32 PCB design by bobc, published on GitHub under the MIT license. It is a 6-layer board measuring 105 × 70 mm, with 350 components from 95 distinct parts.
Its main chip is the MCU-STM32F407VGT6(LQFP100), from the STM32 family. Other key parts include the LAN8742A-CZ-TR, W25Q64JVSSIQ, LM25011MY/NOPB, NCP1117-3.3_SOT223 and AHCT125. By type, the board carries 129 capacitors, 98 resistors, 38 inductors, 34 diodes, 25 connectors and 13 ICs.
From the project
A Prusa Mini 3D model assembly using OpenSCAD
Main components on the Buddy
Buddy bill of materials (BOM)
350 components, 95 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LAN8742A-CZ-TR | VQFN-24-1EP_4x4mm_P0.5mm_EP2.45x2.45mm_ThermalVias | U1 |
| 1 | W25Q64JVSSIQ | SOIC8-wide | U2 |
| 1 | LM25011MY/NOPB | SOP50P490X110-11N | U3 |
| 1 | NCP1117-3.3_SOT223 | SOT-223-3_TabPin2 | U4 |
| 1 | AHCT125 | Texas_S-PVQFN-N14_ThermalVias | U5 |
| 4 | TMC2209-LA | QFN-28_EP_5x5_Pitch0.5mm | U6, U7, U8, U9 |
| 1 | MCU-STM32F407VGT6(LQFP100) | LQFP-100_14x14mm_P0.5mm | U10 |
| 1 | ST25DV64K | TSSOP-8_4.4x3mm_P0.65mm | U11 |
| 1 | STMPS2141STR | SOT-23-5 | U12 |
| 1 | DT1140-04LP | DT1140-04LP | U13 |
| 2 | MMBF170 | SOT-23 | Q1, Q2 |
| 2 | PSMN2R6-40YS | SOT-669_LFPAK_alternate-numbers_VIA | Q3, Q4 |
| 1 | ASE-xxxMHz* | Oscillator_SMD_EuroQuartz_XO53-4Pin_5.0x3.2mm | X1 |
| 1 | Crystal | Crystal-3.2x2.5mm | Y2 |
| 1 | ECS-250-20-30B-AGL-TR | Crystal_SMD_Abracon_ABM3C-4Pin_5.0x3.2mm | Y4 |
| 1 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | 2,54 jumper | MEC | J1-jumper1 |
| 1 | 105017-0001 | USB-micro | J2 |
| 1 | HR911105A | HR911105A | J3 |
| 2 | faston | faston-hole-m | J4, J5 |
Show 75 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Mini-DIN-4-KPJX | KPJX-4S | J6 |
| 5 | 70543-0003 | Pin_1x04-XL | J7, P7, P8, P9, P10 |
| 1 | 302-S141 | IDC-Header_2x07_P2.54mm_Vertical | J8 |
| 3 | 70543-0002 | Pin_1x03-XL | J9, P1, P2 |
| 1 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J10 |
| 1 | UFL coaxial | UFL-MOLEX-73412-0114 | J11 |
| 1 | 67329-8000 | USB-A-vertical-MX-67329-8000 | J20 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J21 |
| 1 | Conn_01x10 | MOLEX_559321010 | J23 |
| 2 | 70543-0001 | Pin_1x02-XL | P3, P4 |
| 2 | TBG-5-PW-2P/GN | PhoenixContact_MSTBVA-G_02x5.08mm_Vertical | P5, P6 |
| 2 | KEYSTONE 3568 | Fuse-Keystone-3557-2 | F1, F3 |
| 1 | fuse 7,5A | MEC | F1-fuse1 |
| 1 | fuse 3A | MEC | F3-fuse3 |
| 1 | TACTA-64N-F | TACT-90 | SW1 |
| 1 | NTCG104LH104JTDS | R_0402_1005Metric | TH1 |
| 18 | BAV99W | SOT-323_SC-70 | D1, D2, D7, D8, D20, D21, D25, D26 +10 |
| 6 | GRN | LED_0603 | D3, D4, D9, D13, D15, D17 |
| 3 | BAT54KFILM | D_SOD-523 | D5, D6, D24 |
| 2 | USBLC6-2P6 | SOT143B | D10, D22 |
| 1 | ESDA6V1L | SOT-23 | D11 |
| 2 | SK310A-TP | DO-214AC | D12, D14 |
| 1 | SMAJ28A | D_SMA | D18 |
| 1 | SK310A | DO-214AC | D19 |
| 36 | BLM18KG121TN1D | R_0603_1608Metric | L1, L2, L3, L4, L5, L6, L7, L8 +28 |
| 1 | BLM41PG600SN1L | R_1806_4516Metric | L12 |
| 1 | 15uH | VLS6045EX | L13 |
| 37 | 100n | C_0402_1005Metric | C1, C2, C3, C4, C6, C7, C9, C10 +29 |
| 1 | 10u* | C_0805_2012Metric | C5 |
| 29 | 100n | C_0603_1608Metric | C8, C14, C22, C23, C25, C26, C28, C29 +21 |
| 4 | 4.7uF | C_0603_1608Metric | C15, C24, C34, C36 |
| 2 | 30p | C_0402_1005Metric | C17, C56 |
| 1 | 4u7 | C_1206_3216Metric | C18 |
| 3 | 1u | C_0603_1608Metric | C19, C78, C117 |
| 1 | 4n7 | C_0402_1005Metric | C20 |
| 1 | 4u7 | C_0805_2012Metric | C21 |
| 5 | 10u | C_0805_2012Metric | C31, C33, C35, C37, C48 |
| 4 | 22n | C_0402_1005Metric | C43, C45, C73, C75 |
| 1 | 10p* | C_0402_1005Metric | C49 |
| 1 | 470p | C_0402_1005Metric | C57 |
| 4 | 100u | c_elec_6.3x7.7 | C60, C61, C90, C91 |
| 16 | 1n | C_0603_1608Metric | C64, C65, C66, C67, C68, C69, C70, C71 +8 |
| 2 | 10n | C_0402_1005Metric | C81, C82 |
| 1 | 100u | C_1206_3216Metric | C86 |
| 4 | 10u | C_1206_3216Metric | C92, C93, C121, C122 |
| 6 | 10p | C_0402_1005Metric | C104, C105, C123, C126, C127, C128 |
| 2 | 2,2u | C_0603_1608Metric | C106, C107 |
| 2 | 10u | C_0603_1608Metric | C116, C118 |
| 1 | 330u | CP_Elec_8x10.5 | C124 |
| 1 | 10n* | C_0402_1005Metric | C129 |
| 15 | 100R | R_0402_1005Metric | R1, R2, R18, R22, R23, R41, R42, R44 +7 |
| 5 | 100k | R_0402_1005Metric | R3, R4, R43, R46, R49 |
| 2 | 2k2 | R_0603_1608Metric | R5, R6 |
| 10 | 1k8 | R_0402_1005Metric | R7, R8, R9, R10, R55, R56, R59, R60 +2 |
| 4 | 2k37 | R_0402_1005Metric | R11, R12, R14, R15 |
| 6 | 4k7 | R_0402_1005Metric | R13, R16, R58, R77, R80, R85 |
| 4 | 620R | R_0603_1608Metric | R17, R88, R94, R95 |
| 1 | 1k | R_0603_1608Metric | R19 |
| 1 | 2k | R_0603_1608Metric | R20 |
| 4 | 1k | R_0402_1005Metric | R21, R64, R79, R82 |
| 6 | 33R | R_0402_1005Metric | R24, R25, R27, R32, R98, R99 |
| 12 | 10k | R_0402_1005Metric | R26, R33, R34, R35, R50, R52, R53, R54 +4 |
| 3 | 1k5 | R_0402_1005Metric | R28, R29, R30 |
| 1 | 12k1 | R_0402_1005Metric | R36 |
| 4 | 49.9R | R_0402_1005Metric | R37, R38, R39, R40 |
| 2 | 10k | R_0603_1608Metric | R45, R48 |
| 1 | 60m | R_2512_6332Metric | R51 |
| 8 | R22 | R_1206 | R65, R66, R67, R68, R73, R74, R75, R76 |
| 1 | 100R* | R_0402_1005Metric | R71 |
| 2 | 10k* | R_0402_1005Metric | R72, R97 |
| 1 | 1k* | R_0402_1005Metric | R83 |
| 2 | 0R | R_0402_1005Metric | R86, R92 |
| 1 | 47k | R_0402_1005Metric | R87 |
| 1 | 510R | R_0402_1005Metric | R91 |
| 1 | 330R | R_0402_1005Metric | R93 |
Buddy design files
The KiCad project lives in the bobc/Prusa-Mini-assembly repository on GitHub; these links point at the commit this page was built from.
Buddy: common questions
What microcontroller does the Buddy use?
The Buddy is built around the MCU-STM32F407VGT6(LQFP100), from the STM32 family.
How big is the Buddy PCB?
The Buddy measures 105 × 70 mm, has 6 copper layers and is 1.6 mm thick.
How many components are on the Buddy?
350 components, from 95 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 Buddy design files?
From the bobc/Prusa-Mini-assembly repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Buddy design in my own project?
Yes, under the terms of its MIT license, which bobc chose for the repository.
Can I test firmware for the Buddy 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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