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Coax-Switch-Controller

custom-ds·Coax-Switch-Controller·Coax Switch Controller/Coax Switch Controller.kicad_pcb

Coax-Switch-Controller PCB layout, top view — open source ESP32 board by custom-ds
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About the Coax-Switch-Controller PCB

Coax-Switch-Controller is an open source ESP32 PCB design by custom-ds, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 118 × 83 mm, with 129 components from 17 distinct parts.

Its main chip is the SPX-18018, from the ESP32 family. Other key parts include the 74HC238 and LM1085-5.0. By type, the board carries 48 resistors, 25 diodes, 24 transistors, 16 inductors, 9 capacitors and 4 ICs.

It belongs with the rf & radio, iot & wireless and displays & leds designs in this gallery.

From the project

Wifi-enabled controller to select two radios between six antenna outputs.

A WiFi-enabled coax antenna switch controller for amateur radio stations. It allows two radios to select one of six antennas each, with relay control driven by a custom PCB and an ESP32-based controller. The system supports both a front-panel interface and a built-in web UI / REST API.

This project is designed to let a station operator:

- switch each radio between up to six antenna outputs - optionally disconnect a radio from all antennas - control the switch from the local front panel using a rotary knob and LCD - control the switch from a browser or automation client over WiFi - retain…

Main components on the Coax-Switch-Controller

SPX-1801874HC238LM1085-5.0

Coax-Switch-Controller bill of materials (BOM)

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

QtyPartRefs
1
SPX-18018
~
U1
2
74HC238
U2, U3
1
LM1085-5.0
U4
12
MMBT3904
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +4
12
DMP2004K-7
Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20 +4
2
8P8C
J1, J2
1
SCREW_TERMINAL_01X02
Screw_Terminal_01x02
J3
12
1N4007
MRA4007T3G
D1, D2, D3, D4, D5, D6, D7, D8 +4
12
LED
D13, D14, D15, D16, D17, D18, D19, D20 +4
1
1N4007
D25
16
FerriteBead
FB1, FB2, FB3, FB4, FB5, FB6, FB7, FB8 +8
3
10UF
C_Polarized_US
C1, C3, C6
6
.01uF
C2, C4, C5, C7, C8, C9
12
4.7K
4.7k
R1, R2, R3, R4, R5, R6, R7, R8 +4
12
100K
100k
R13, R14, R15, R16, R17, R18, R19, R20 +4
12
10K
10k
R25, R26, R27, R28, R29, R30, R31, R32 +4
12
1k
R37, R38, R39, R40, R41, R42, R43, R44 +4

Coax-Switch-Controller design files

The KiCad project lives in the custom-ds/Coax-Switch-Controller repository on GitHub; these links point at the commit this page was built from.

Coax-Switch-Controller: common questions

What microcontroller does the Coax-Switch-Controller use?

The Coax-Switch-Controller is built around the SPX-18018, from the ESP32 family.

How big is the Coax-Switch-Controller PCB?

The Coax-Switch-Controller measures 118 × 83 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Coax-Switch-Controller?

129 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 Coax-Switch-Controller design files?

From the custom-ds/Coax-Switch-Controller 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 Coax-Switch-Controller design in my own project?

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

Can I test firmware for the Coax-Switch-Controller without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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