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RS485USB

jirihusak·majordomus·HW/RS4852USB/PCB/RS485USB.kicad_pcb

RS485USB PCB layout, top view — open source board by jirihusak
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About the RS485USB PCB

RS485USB is an open source PCB design by jirihusak, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 68 × 87 mm, with 120 components from 31 distinct parts.

Other key parts include the FT230XS, ISO7331C (PAI131M31), SN75176BDR, USBLC6-2SC6 and TUSB2046B. By type, the board carries 45 resistors, 40 capacitors, 16 ICs, 6 connectors, 6 diodes and 1 crystal.

It belongs with the iot & wireless and sensors designs in this gallery.

From the project

Open source system for smart home

Majordomus is a modular automation system built on open standards. It fills the gap between closed, expensive commercial solutions and unreliable consumer-grade components — designed to be repairable, expandable, and to last for decades.

- 🧩 Modular hardware — base unit + interchangeable modules ( I/O, sensors) - 🔌 Standardized interface — RS-485 / ModBus HW interface, MQTT SW interface - 🔓 Vendor lock-in free — open hardware, open software, your choice - 🧠 Node-RED inside — visual programming for automation flows - 🧠 Home Assistant interface — MQTT integration for popular platform - 📡…

RS485USB, from the project README
From the project README

Main components on the RS485USB

FT230XSISO7331C (PAI131M31)SN75176BDRUSBLC6-2SC6TUSB2046BTLV70233DBVRR-78E5.0-1.0

RS485USB bill of materials (BOM)

120 components, 31 distinct parts.

QtyPartRefs
4
FT230XS
U1, U4, U7, U10
4
ISO7331C (PAI131M31)
U2, U5, U8, U11
4
SN75176BDR
U3, U6, U9, U12
1
USBLC6-2SC6
U13
1
TUSB2046B
U14
1
TLV70233DBVR
U15
1
R-78E5.0-1.0
U16
1
AB308-6.000MHZ
Y1
1
Conn_01x03
J1
1
USB4145-03-0170-C
J2
4
RJ45_LED_Shielded
J3, J4, J5, J6
1
NML0505SC
PS1
5
Thermistor_PTC
TH1, TH2, TH3, TH4, TH5
4
CDSOT23-T15C
D1, D2, D3, D4
1
SMAJ28A
D5
1
LED Green
D6
1
100nF / 600V
C1
14
100nF
C2, C3, C4, C6, C7, C8, C10, C11 +6
10
1uF
C5, C9, C13, C17, C18, C21, C34, C35 +2
2
16 pF
C19, C20
Show 11 more
QtyPartRefs
10
22pF
C22, C24, C25, C26, C27, C28, C29, C30 +2
3
10uF
C33, C37, C38
1
1k / 600V
R1
2
5.1 k
R2, R3
8
330R
R4, R5, R9, R10, R14, R15, R19, R20
8
10R
R6, R7, R11, R12, R16, R17, R21, R22
4
120R
R8, R13, R18, R23
10
27R
R24, R26, R29, R30, R31, R32, R33, R34 +2
2
1k5
R25, R28
2
1.5k
R27, R45
8
15k
R37, R38, R39, R40, R41, R42, R43, R44

RS485USB design files

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

RS485USB: common questions

How big is the RS485USB PCB?

The RS485USB measures 68 × 87 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RS485USB?

120 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the RS485USB design files?

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

Can I use the RS485USB design in my own project?

Yes, under the terms of its GPL-3.0 license, which jirihusak chose for the repository.

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