HardLabs

HostBoard

comradef191·ThermEX·LegacyVersions/ThermEX16-Carrier-V1/HostBoard.kicad_pcb

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

HostBoard 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 78.2 × 70.2 mm, with 53 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 ThermEX16 Slot. By type, the board carries 16 connectors, 16 resistors, 15 capacitors, 3 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…

HostBoard, from the project README
From the project README

Main components on the HostBoard

TPS7A2033PDBVRThermEX16 Slot

HostBoard bill of materials (BOM)

53 components, 14 distinct parts.

QtyPartRefs
1
~
U1
1
TPS7A2033PDBVR
U2
1
ThermEX16 Slot
U3
2
2.54_1x5-M
J1, J3
1
2.54_2x5-M
J2
1
2.54_2x4-M
J4
2
1x4-JSTXH
J5, J6
10
1x2-JSTXH
J7, J8, J9, J10, J11, J12, J13, J14 +2
3
TestPoint
TP1, TP2, TP3
2
1uF
C1, C4
12
100nF
C2, C5, C6, C7, C8, C9, C10, C11 +4
1
10uF
C3
6
DNP
R1, R2, R3, R4, R5, R6
10
4.7kΩ
R7, R8, R9, R10, R11, R12, R13, R14 +2

HostBoard design files

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

HostBoard: common questions

What microcontroller does the HostBoard use?

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

How big is the HostBoard PCB?

The HostBoard measures 78.2 × 70.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the HostBoard?

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

Where can I download the HostBoard 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 HostBoard 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 HostBoard 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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