HardLabs

Ethernet bob

coon42·stmbl_otter·hw/kicad/bob/ethernet_bob/ethernet_bob.kicad_pcb

Ethernet bob PCB layout, top view — open source STM32 board by coon42
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About the Ethernet bob PCB

Ethernet bob is an open source STM32 PCB design by coon42, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 59.2 × 66 mm, with 64 components from 27 distinct parts.

Its main chip is the STM32F407VETx, from the STM32 family. Other key parts include the KSZ8081, NCP1117ST33T3G, CAT250_EEPROM, USBLC6-4SC6 and SP3485EN. By type, the board carries 26 capacitors, 21 resistors, 7 connectors, 6 ICs, 1 crystal and 1 jumper.

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

From the project

- For some reason you need exactly this compiler: gcc-arm-none-eabi-54-2016q3 - On any newer gcc version, the board does not boot after flashing !? - Adjust path in TOOLCHAIN variable in toolchain.mak** file - The board works correctly if the green LED lights up. When receiving d

- For some reason you need exactly this compiler: gcc-arm-none-eabi-54-2016q3 - On any newer gcc version, the board does not boot after flashing !? - Adjust path in TOOLCHAIN variable in toolchain.mak** file - The board works correctly if the green LED lights up. When receiving data over UART the LED flashes blue.

- Bridge pins for DFU mode while plugging in USB cable - Flash by using the following command:

Ethernet bob, from the project README
From the project README

Main components on the Ethernet bob

KSZ8081STM32F407VETxNCP1117ST33T3GCAT250_EEPROMUSBLC6-4SC6SP3485EN

Ethernet bob bill of materials (BOM)

64 components, 27 distinct parts.

QtyPartRefs
1
KSZ8081
U1
1
STM32F407VETx
U2
1
NCP1117ST33T3G
U3
1
CAT250_EEPROM
U4
1
USBLC6-4SC6
U5
1
SP3485EN
U7
1
CRYSTAL_SMD_4pin
X1
1
HR911105_RJ45
J1
1
USB_OTG
P1
2
CONN_02X25
P2, P3
1
USB_A
P4
2
CONN_01X04
P5, P6
1
BOOT0
JP1
1
SW_PUSH
SW1
1
D_Schottky
D1
15
100n
C1, C3, C6, C7, C11, C12, C13, C14 +7
3
22µ
C2, C4, C24
1
C
C5
2
18pF
C8, C9
4
C
C10, C20, C21, C22
Show 7 more
QtyPartRefs
1
C
C25
1
6k49
R1
9
1k
R2, R5, R10, R12, R13, R14, R15, R17 +1
6
R
R3, R6, R7, R8, R9, R11
2
220
R4, R21
2
R
R16, R20
1
R
R18

Ethernet bob design files

The KiCad project lives in the coon42/stmbl_otter repository on GitHub; these links point at the commit this page was built from.

Ethernet bob: common questions

What microcontroller does the Ethernet bob use?

The Ethernet bob is built around the STM32F407VETx, from the STM32 family.

How big is the Ethernet bob PCB?

The Ethernet bob measures 59.2 × 66 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ethernet bob?

64 components, from 27 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ethernet bob design files?

From the coon42/stmbl_otter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Ethernet bob design in my own project?

Yes, under the terms of its GPL-3.0 license, which coon42 chose for the repository.

Can I test firmware for the Ethernet bob 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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