HardLabs

Relaymux

PetteriAimonen·relaymux·pcb/relaymux.kicad_pcb

Relaymux PCB layout, top view — open source STM32 board by PetteriAimonen
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About the Relaymux PCB

Relaymux is an open source STM32 PCB design by PetteriAimonen, published on GitHub under the BSD-2-Clause license. It is a 2-layer board measuring 120.4 × 100.4 mm, with 55 components from 26 distinct parts.

Its main chip is the STM32F042F6P6, from the STM32 family. Other key parts include the TBD62783AFG,EL, TPS2552DBVR and TLV70033DDCR. By type, the board carries 15 resistors, 12 connectors, 10 diodes, 8 relays, 4 ICs and 4 capacitors.

It belongs with the test & measurement designs in this gallery.

From the project

Hardware and firmware for a USB connected relay box

This repository contains hardware and firmware for a USB Relay Mux that has two independent halves, each of which multiplexes a pair of signals to four channels. It is designed for use in automatic testing, for example to switch input signals to multimeter or to change polarity of a power supply.

[](images/relaymux1.jpg) [](images/relaymux2.jpg)

Many of the cheap USB relay boards are designed for switching large currents, and not for lab usage. They have several shortcomings:

Relaymux, from the project README
From the project README

Main components on the Relaymux

STM32F042F6P6TBD62783AFG,ELTPS2552DBVRTLV70033DDCR

Relaymux bill of materials (BOM)

55 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042F6P6
STM32F042F6Px
U1
1
TBD62783AFG,EL
TBD62783A
U2
1
TPS2552DBVR
TPS2552D
U3
1
TLV70033DDCR
TLV70033_SOT23-5
U4
1
A
J1
1
A1
J2
1
A2
J3
1
A3
J4
1
A4
J5
1
B
J6
1
B1
J7
1
B2
J8
1
B3
J9
1
B4
J10
1
U262-161N-4BVC11
USB_C
J11
1
Debug
J12
8
TQ2SA-5V
K1, K2, K3, K4, K5, K6, K7, K8
1
320E11BLK
Cycle
SW1
1
320E11BLK
Boot/Clear
SW2
9
LTST-C230KGKT
LED
D1, D2, D3, D4, D5, D6, D7, D8 +1
Show 6 more
QtyPartRefs
1
SMAJ5.0A
D9
3
CL21A106KAYNNNE
10µF
C1, C3, C4
1
UWD1E471MCL1GS
470µF
C5
9
Generic
470
R1, R2, R3, R4, R5, R6, R7, R8 +1
2
Generic
5k1
R9, R10
4
Generic
68k
R11, R12, R14, R15

Relaymux design files

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

Relaymux: common questions

What microcontroller does the Relaymux use?

The Relaymux is built around the STM32F042F6P6, from the STM32 family.

How big is the Relaymux PCB?

The Relaymux measures 120.4 × 100.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Relaymux?

55 components, from 26 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 Relaymux design files?

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

Can I use the Relaymux design in my own project?

Yes, under the terms of its BSD-2-Clause license, which PetteriAimonen chose for the repository.

Can I test firmware for the Relaymux 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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