HardLabs

Onstep

andshn·OnStep_STM32_PCB·onstep_pcb/onstep.kicad_pcb

Onstep PCB layout, top view — open source STM32 board by andshn

About the Onstep PCB

Onstep is an open source STM32 PCB design by andshn, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 120 × 100 mm, with 128 components from 48 distinct parts.

Its main chip is the STM32F103C8T6, from the STM32 family. By type, the board carries 51 resistors, 49 capacitors, 13 diodes, 3 crystals, 1 LED and 1 inductor.

From the project

This is a PCB for OnStep, designed for 1455N1201 case. In the board use XLR connectors for steper drivers. The DB9 connector use for the hand controller.

This is a PCB for OnStep, designed for 1455N1201 case. In the board use XLR connectors for steper drivers. The DB9 connector use for the hand controller.

onsteppcb/ - KiCad project files for the board endplates/ - Case end plates drawings as KiCad PCB files project_outputs/ - Gerbers, BOM, PDFs, etc

Note: this project contains partially modified elements from the KiCad Libraries.

Onstep, from the project README
From the project README

Onstep bill of materials (BOM)

128 components, 48 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
"USB"
X1
1
Battery Holder
X2
1
"FUSE"
X3
1
Speaker
BA1
1
8 MHz
BQ1
1
STPS5L60S
VD1
1
"Bootloader"
XP1
1
"UART"
XP2
1
"DRV1"
XP3
1
"12V"
XP4
1
"SWD"
XP5
1
"DRV2"
XP6
1
"DRV3"
XP7
1
LED
HL1
2
MCP1700
D1, D6
1
STM32F103C8T6
D2
3
TMC2130
D3, D8, D13
1
M24C32
D4
1
DS3231
D5
1
FT230
D7
Show 28 more
QtyPartRefs
2
6N137
D9, D10
1
P78E03
D11
1
MCP1700T
D12
1
BLM21AG601SN1D
L1
9
1 uF
C1, C2, C3, C19, C20, C21, C40, C41 +1
3
4.7 uF
C4, C23, C42
2
24 pF
C5, C6
20
0.1 uF
C7, C8, C9, C10, C11, C13, C22, C25 +12
4
4.7 uF
C12, C24, C31, C48
3
0.022 uF
C14, C33, C47
3
100 uF
C15, C35, C49
2
47 pF
C16, C18
1
0.01 uF
C17
2
10 uF
C27, C36
5
1k
R1, R2, R27, R28, R34
7
10k
R3, R6, R7, R9, R13, R16, R17
1
390
R4
3
2.2
R5, R19, R32
6
0.12
R8, R10, R23, R24, R48, R49
3
20k
R11, R25, R50
3
20k
R12, R26, R51
2
27
R14, R15
8
DNI
R18, R22, R29, R35, R36, R39, R40, R42
2
220
R20, R21
2
100
R30, R31
1
470
R33
4
0
R37, R38, R41, R43
4
2.2k
R44, R45, R46, R47

Onstep design files

The KiCad project lives in the andshn/OnStep_STM32_PCB repository on GitHub; these links point at the commit this page was built from.

Onstep: common questions

What microcontroller does the Onstep use?

The Onstep is built around the STM32F103C8T6, from the STM32 family.

How big is the Onstep PCB?

The Onstep measures 120 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Onstep?

128 components, from 48 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 Onstep design files?

From the andshn/OnStep_STM32_PCB repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Onstep design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which andshn chose for the repository.

Can I test firmware for the Onstep 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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