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Klipper-Expander

timmit99·Klipper-Expander·KiCad/STM32_Klipper_Expander.kicad_pcb

Klipper-Expander PCB layout, top view — open source STM32 board by timmit99

About the Klipper-Expander PCB

Klipper-Expander is an open source STM32 PCB design by timmit99, published on GitHub. It is a 2-layer board measuring 100 × 24 mm, with 55 components from 20 distinct parts.

Its main chip is the STM32F042F6PX, from the STM32 family. Other key parts include the AP2127K-3.3 and 74LVC1G17. By type, the board carries 22 resistors, 11 connectors, 7 diodes, 6 capacitors, 4 transistors and 3 ICs.

From the project

Simple MCU board for use with Klipper 3D Printer firmware with: - STM32F042F6P6 MCU with internal oscilator - SWD header for easy debugging - 4 3A Mosfet outputs - 2 Thermistor inputs - 1 Level Shifted Neopixel output - 1 GPIO header - I2C Header with Pullup Resistors

Simple MCU board for use with Klipper 3D Printer firmware with: - STM32F042F6P6 MCU with internal oscilator - SWD header for easy debugging - 4 3A Mosfet outputs - 2 Thermistor inputs - 1 Level Shifted Neopixel output - 1 GPIO header - I2C Header with Pullup Resistors

Parts that need to be sourced if assembled by JLC: - Micro USB port Molex 105017-0001 or equivalent Amazon - Keystone Fuse Holder Keystone 3544-2 - Mini Blade Fuse 2A 32V, 5A 32V, 10A 32V, or Amazon Assortment - 2 Pin Tactile Switch 6 x 3.5mm Button or Amazon - Screw Terminals 5.08mm Screw Terminals

Klipper-Expander, from the project README
From the project README

Main components on the Klipper-Expander

STM32F042F6PXAP2127K-3.374LVC1G17

Klipper-Expander bill of materials (BOM)

55 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042F6PX
STM32F042F6Px
U1
1
AP2127K-3.3
U2
1
74LVC1G17
U3
4
IRLML6344TRPBF
Q1, Q2, Q3, Q4
1
USB_B_Micro
J1
1
CONN_01X04
Conn_01x04
J2
3
CONN_01X03
Conn_01x03
J4, J11, J12
1
Vin
J5
1
SCREW_TERMINAL_01X08
Screw_Terminal_01x08
J6
3
CONN_01X02
Conn_01x02
J7, J8, J9
1
CONN_01X01
Conn_01x01
J10
1
Fuse
F1
1
SW_SPST
SW2
7
LED
D1, D2, D3, D4, D5, D6, D7
2
0.1UF
0.1uF
C1, C3
4
4.7UF
4.7uF
C2, C4, C5, C6
7
10K
R1, R2, R6, R11, R12, R13, R14
2
1K
R3, R21
9
4.7K
R4, R5, R15, R16, R17, R18, R19, R20 +1
4
100
R7, R8, R9, R10

Klipper-Expander design files

The KiCad project lives in the timmit99/Klipper-Expander repository on GitHub; these links point at the commit this page was built from.

Klipper-Expander: common questions

What microcontroller does the Klipper-Expander use?

The Klipper-Expander is built around the STM32F042F6PX, from the STM32 family.

How big is the Klipper-Expander PCB?

The Klipper-Expander measures 100 × 24 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Klipper-Expander?

55 components, from 20 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 Klipper-Expander design files?

From the timmit99/Klipper-Expander repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Klipper-Expander design in my own project?

The repository has no license, so all rights stay with timmit99. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Klipper-Expander 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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