Imported from GitHub: comradef191/ThermEX · commit 2256d2c · license CERN-OHL-S-2.0

Description

OSHW Thermistor expansion board for Klipper

README

ThermEX

A BlackPill powered expansion board for Klipper 3D printers, allowing the use of numerous additional Thermistors.

• Can be stacked ontop of or underneith Nyoomies using appropiate spacers
• OpenSource Hardware, licensed under the OHLv2-S
• 10 thermistors wired directly to the STM32
• 16 additional thermistors wired up via 4 ADS1115 ICs
• Powered directly from the USB port
• Uses an ultra-low-noise TPS7A2033 300mA 3.3v voltage regulator to power all expansion headers and the ADS1115s
• Features native support for the STM32F4x1 BlackPill, with the unused extra GPIO being broken out to a labelled expansion header alongside 3v3 & GND
• Breaks out the I2C2 & I2C3 busses to a pair of dedicated 4-pin JST-XH connectors
• Breaks out the SPI2 bus to a dedicated header, alongside PB12 to act as chip-select

NOTICE

if you are ordering a batch of PCBs, please for the love of god please use the pre-made gerber files in the Releases tab instead of downloading the repo, ignoring KiCADs warning you haven't got a font installed, and then exporting your own files which both have the I2C bus shorted out (rendering only 10 thermistor ports usable) due to the missing font breaking artwork on the copper layer plus has had markings crediting me destroyed.

Vendors

UK / EU

• None... yet!

Contact me on Discord if you want to add yourself to this list!

Bill of Materials

This BoM lists exclusively through-hole components, as SMD components will be assembled for you by JLCPCB

Component	QTY	Cost	Comment	Sourcing URL
JST-XH 2-Pin	26	$0.39	Thermistor Ports	https://www.lcsc.com/product-detail/Wire-To-Board-Connector_DEALON-XH-D-2A_C5160911.html
JST-XH 4-Pin	2	$0.52	I2C Ports	https://www.lcsc.com/product-detail/Wire-To-Board-Connector_JST-B4B-XH-A-LF-SN_C144395.html
2.54 Socket, 1x20	2	$0.81	STM32 Socket	https://www.lcsc.com/product-detail/Female-Headers_Shenzhen-Kinghelm-Elec-KH-2-54FH-1X20P-H8-5_C2905423.html
2.54 Header, 2x5	3	$0.40	GPIO; Cut-Down for SPI	https://www.lcsc.com/product-detail/Pin-Headers_HanElectricity-2541WV-2x05P_C5383106.html
STM32F401 Blackpill	1	$3.25	Main controller	https://www.aliexpress.com/item/1005006127461676.html

Gallery

As of 09APR25 no ThermEX26 boards have been produced, thus only KiCad Renders are present currently