HardLabs

Longboi

KungfuPancake·longboi·pcb/longboi.kicad_pcb

Longboi PCB layout, top view — open source STM32 board by KungfuPancake
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About the Longboi PCB

Longboi is an open source STM32 PCB design by KungfuPancake, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 358 × 40 mm, with 285 components from 57 distinct parts.

Its main chip is the STM32H723VGTx, from the STM32 family. Other key parts include the SN74LVC245APW, TMC2209-LA, DRV8837, 74LVC1G126 and TPS2116DRL. By type, the board carries 109 resistors, 81 capacitors, 37 connectors, 26 diodes, 23 ICs and 3 transistors.

It belongs with the robotics & motion designs in this gallery.

From the project

Possibly the longest controller board to control the BoxTurtle AFC

The Longboi sits behind the full width of the BoxTurtle front panel and allows very short cable runs of equal length from each respooler and extruder. It's equipped with a beefy STM32H723 MCU and can be controlled with CAN or USB. If using CAN it's also daisy chainable for 8, 12 or even more lanes!

Please be aware that the BOM only contains a fuse holder, the fuses (2410/1808) have to be sourced separately. 4A is a good value to start, depending on the heater you may or may not use the value can be scaled up or down accordingly.

Longboi, from the project README
From the project README

Main components on the Longboi

STM32H723VGTxSN74LVC245APWTMC2209-LADRV883774LVC1G126TPS2116DRLTPS56637RPARME6211C33M5SMF05CT1G-ESTCAN332G

Longboi bill of materials (BOM)

285 components, 57 distinct parts.

QtyPartRefs
1
STM32H723VGTx
U1
2
SN74LVC245APW
U2, U3
4
TMC2209-LA
U4, U5, U6, U7
4
DRV8837
U8, U9, U10, U11
6
74LVC1G126
U12, U13, U14, U15, U21, U22
1
TPS2116DRL
U17
1
TPS56637RPAR
U18
1
ME6211C33M5
U19
2
SMF05CT1G-ES
U20, U23
1
TCAN332G
U24
1
HY1904C2
Q1
2
IRLML0030
Q2, Q4
1
25MHz
Y1
1
JST-PH
J6
4
Conn_01x04_Pin
J7, J8, J9, J10
7
Conn_01x02_Pin
J11, J12, J13, J14, J41, J44, J50
21
Conn_01x03_Pin
J15, J16, J17, J18, J23, J24, J25, J26 +13
1
Conn_01x02_Pin
J19
2
MX3.0
J20, J21
1
Conn_01x02_Pin
J39
Show 37 more
QtyPartRefs
1
4A
F1
2
SW_SPST
SW1, SW2
1
TYPE-C-31-M-15
USB1
1
Blue
D1
3
Green
D2, D3, D4
3
Red
D5, D6, D9
2
1N4007
D7, D10
16
Yellow
D15, D16, D17, D18, D19, D20, D21, D22 +8
1
BAV99
D32
1
L_Ferrite
L1
4
10uF
C1, C4, C57, C59
40
100nF
C2, C5, C7, C9, C11, C12, C13, C14 +32
2
12pF
C3, C6
6
2.2uF
C8, C10, C18, C24, C30, C36
4
22nF
C16, C22, C28, C34
12
1uF
C19, C25, C31, C37, C40, C41, C42, C43 +4
8
47uF
C20, C21, C26, C27, C32, C33, C38, C39
2
10uF
C53, C54
1
100pF
C58
2
22uF
C60, C61
4
2.7k
R1, R24, R64, R70
2
15k
R2, R3
8
110m
R4, R5, R6, R7, R8, R9, R10, R11
1
120
R12
33
100k
R13, R16, R17, R28, R29, R31, R33, R35 +25
1
56k
R14
1
0
R15
19
3.3k
R18, R25, R61, R79, R80, R81, R82, R83 +11
1
20k
R19
9
10k
R20, R23, R26, R27, R63, R66, R67, R68 +1
1
49.9
R21
1
73.2k
R22
19
100
R30, R32, R34, R36, R38, R40, R42, R44 +11
2
5.1k
R69, R73
2
2.37k
R108, R109
1
4.7k
R110
4
10k
RN1, RN2, RN3, RN4

Longboi design files

The KiCad project lives in the KungfuPancake/longboi repository on GitHub; these links point at the commit this page was built from.

Longboi: common questions

What microcontroller does the Longboi use?

The Longboi is built around the STM32H723VGTx, from the STM32 family.

How big is the Longboi PCB?

The Longboi measures 358 × 40 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Longboi?

285 components, from 57 distinct parts. The full bill of materials is listed on this page.

Where can I download the Longboi design files?

From the KungfuPancake/longboi repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Longboi design in my own project?

Yes, under the terms of its Apache-2.0 license, which KungfuPancake chose for the repository.

Can I test firmware for the Longboi 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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