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ThermEX26

comradef191·ThermEX·ThermEX26/ThermEX26.kicad_pcb

ThermEX26 PCB layout, top view — open source STM32 board by comradef191
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About the ThermEX26 PCB

ThermEX26 is an open source STM32 PCB design by comradef191, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 91.4 × 57.5 mm, with 104 components from 14 distinct parts.

Its main chip is the Socketed MCU - STM32 BlackPill, from the STM32 family. Other key parts include the TPS7A2033PDBVR and ADS1115IDGSR. By type, the board carries 35 capacitors, 32 connectors, 28 resistors, 6 ICs and 3 test points.

From the project

OSHW Thermistor expansion board for Klipper

- 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…

ThermEX26, from the project README
From the project README

Main components on the ThermEX26

TPS7A2033PDBVRADS1115IDGSR

ThermEX26 bill of materials (BOM)

104 components, 14 distinct parts.

QtyPartRefs
1
~
U1
1
TPS7A2033PDBVR
U2
4
ADS1115IDGSR
U3, U4, U5, U6
2
2.54_1x5-M
J1, J3
1
2.54_2x5-M
J2
26
1x2-JSTXH
J4, J5, J6, J7, J8, J9, J10, J11 +18
1
2.54_2x4-M
J14
2
1x4-JSTXH
J15, J16
3
TestPoint
TP1, TP2, TP3
28
100nF
C1, C2, C3, C4, C5, C6, C7, C8 +20
6
1uF
C11, C14, C20, C25, C30, C35
1
10uF
C13
26
4.7kΩ
R1, R2, R3, R4, R5, R6, R7, R8 +18
2
10kΩ
R27, R28

ThermEX26 design files

The KiCad project lives in the comradef191/ThermEX repository on GitHub; these links point at the commit this page was built from.

ThermEX26: common questions

What microcontroller does the ThermEX26 use?

The ThermEX26 is built around the Socketed MCU - STM32 BlackPill, from the STM32 family.

How big is the ThermEX26 PCB?

The ThermEX26 measures 91.4 × 57.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ThermEX26?

104 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the ThermEX26 design files?

From the comradef191/ThermEX repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the ThermEX26 design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which comradef191 chose for the repository.

Can I test firmware for the ThermEX26 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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