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OtterStepMini

Jana-Marie·OtterStepMini

OtterStepMini PCB layout, top view — open source STM32 board by Jana-Marie
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About the OtterStepMini PCB

OtterStepMini is an open source STM32 PCB design by Jana-Marie, published on GitHub. It is a 4-layer board measuring 68.4 × 50 mm, with 63 components from 26 distinct parts.

Its main chip is the STM32F072CBTx, from the STM32 family. Other key parts include the STUSB4500, USBLC6-4, powerSTEP01, SE8633X2-HF and RS485. By type, the board carries 27 capacitors, 19 resistors, 7 ICs, 5 connectors, 4 diodes and 1 switch.

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

From the project

OtterStepMini is a user friendly, up to 48V 10A stepper-motor-driver with USB-CDC and USB-PD for desktop-applications.

OtterStepMini is a user friendly, up to 48V 10A stepper-motor-driver. It can be controlled via RS485 or USB-CDC and also comes with a 100W USB-PD input, for extra convinience on stepper-motor testing and for small desktop applications (e.g. 3D-scanner turntable).

The board has not been tested and should not be ordered yet.

OtterStepMini, from the project README
From the project README

Main components on the OtterStepMini

STUSB4500USBLC6-4powerSTEP01SE8633X2-HFSTM32F072CBTxRS485

OtterStepMini bill of materials (BOM)

63 components, 26 distinct parts.

QtyPartRefs
1
STUSB4500
U1
2
USBLC6-4
U2, U7
1
powerSTEP01
U3
1
SE8633X2-HF
U4
1
STM32F072CBTx
U5
1
RS485
U6
1
USB
J1
1
PWR
J2
1
IN
J3
1
OUT
J4
1
ENC
J5
1
SW_Push
SW1
2
SK1010C
D1, D4
2
SS34
D2, D3
4
1u
C1, C2, C3, C6
11
100n
C4, C5, C7, C20, C21, C22, C23, C24 +3
2
470n
C9, C14
1
22uF
C10
7
220n
C11, C12, C13, C17, C18, C28, C29
1
47n
C15
Show 6 more
QtyPartRefs
1
220uF
C19
7
5k1
R1, R2, R3, R4, R5, R9, R11
2
0R1
R6, R7
2
260k
R8, R10
7
22
R12, R14, R15, R16, R17, R18, R19
1
DNP
R13

OtterStepMini design files

The KiCad project lives in the Jana-Marie/OtterStepMini repository on GitHub; these links point at the commit this page was built from.

OtterStepMini: common questions

What microcontroller does the OtterStepMini use?

The OtterStepMini is built around the STM32F072CBTx, from the STM32 family.

How big is the OtterStepMini PCB?

The OtterStepMini measures 68.4 × 50 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the OtterStepMini?

63 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the OtterStepMini design files?

From the Jana-Marie/OtterStepMini repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the OtterStepMini design in my own project?

The repository has no license, so all rights stay with Jana-Marie. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the OtterStepMini 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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