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Relacon-HW

fjenner·Relacon-HW

Relacon-HW PCB layout, top view — open source STM32 board by fjenner
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About the Relacon-HW PCB

Relacon-HW is an open source STM32 PCB design by fjenner, published on GitHub. It is a 2-layer board measuring 85.7 × 54 mm, with 48 components from 17 distinct parts.

Its main chip is the STM32F042K6TX, from the STM32 family. Other key parts include the AMS1117-3.3, ULN2803A and AQY212GS. By type, the board carries 17 resistors, 11 ICs, 9 capacitors, 8 diodes and 3 connectors.

From the project

The Relacon is a low-cost open source hardware USB relay controller

The Relacon relay controller is intended to be an open source hardware alternative to the ADU218 USB relay I/O interface from OnTrak Control Systems, Inc. The Relacon is not as robust as the commercial offering, but what it lacks in polish it makes up for in cost. Relacon relay controller is about an order of magnitude cheaper to make yourself compared to purchasing an ADU218.

Relacon-HW, from the project README
From the project README

Main components on the Relacon-HW

STM32F042K6TXAMS1117-3.3ULN2803AAQY212GS

Relacon-HW bill of materials (BOM)

48 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042K6TX
STM32F042K6Tx
U1
1
AMS1117-3.3
U2
1
ULN2803A
U3
8
AQY212GS
U4, U5, U6, U7, U8, U9, U10, U11
1
USB_B
J1
1
CONN_02X10_ODD_EVEN
Conn_02x10_Odd_Even
J2
1
CONN_01X16
Conn_01x16
J3
8
LED
D1, D2, D3, D4, D5, D6, D7, D8
1
47UF
47uF
C1
1
22UF
22uF
C2
3
100NF
100nF
C3, C4, C6
2
4.7UF
4.7uF
C5, C7
1
10NF
10nF
C8
1
1UF
1uF
C9
1
10K
10k
R1
8
470
R2, R3, R4, R5, R10, R11, R12, R13
8
750
R6, R7, R8, R9, R14, R15, R16, R17

Relacon-HW design files

The KiCad project lives in the fjenner/Relacon-HW repository on GitHub; these links point at the commit this page was built from.

Relacon-HW: common questions

What microcontroller does the Relacon-HW use?

The Relacon-HW is built around the STM32F042K6TX, from the STM32 family.

How big is the Relacon-HW PCB?

The Relacon-HW measures 85.7 × 54 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Relacon-HW?

48 components, from 17 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 Relacon-HW design files?

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

Can I use the Relacon-HW design in my own project?

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

Can I test firmware for the Relacon-HW 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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