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N1kdo band selector

n1kdo·BandSelector·kicad/BandSelector/BandSelector.kicad_pcb

N1kdo band selector PCB layout, top view — open source RP2040/RP2350 board by n1kdo

About the N1kdo band selector PCB

N1kdo band selector is an open source RP2040/RP2350 PCB design by n1kdo, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 105.5 × 77.7 mm, with 58 components from 22 distinct parts.

Its main chip is the PicoW, from the RP2040/RP2350 family. Other key parts include the L7805. By type, the board carries 12 test points, 11 resistors, 10 diodes, 10 capacitors, 7 inductors and 3 connectors.

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

From the project

IOT BandSelector (also known as a Band Decoder) works with Antenna Switch Controller to perform automated antenna selection on band change

This project is intended to operate a remote antenna switch.

How is it different from commercial-off-the-shelf solutions? Direct interface with Elecraft 15-Pin accessory interface. It reads BCD band data using the Elecraft Y-cable or a device like a Y-box. provides transmit inhibit and power-on sense/control. it's not designed for other radios. Tested on Elecraft only. It should work with other radios that use similar BCD active low band signaling. Wireless! It runs over Wi-Fi, connect the band selector to the 15-pin accessory connector, and supply DC to the coaxial power jack. Automatic TX…

N1kdo band selector, from the project README
From the project README

Main components on the N1kdo band selector

PicoWL7805

N1kdo band selector bill of materials (BOM)

58 components, 22 distinct parts.

QtyPartRefs
1
PicoW
U1
1
L7805
U2
2
2N7000
Q1, Q2
1
DE15_Plug_HighDensity_MountingHoles
J1
1
70553-0001
POWER
J2
1
75915-416LF
75915416LF
J3
1
Polyfuse
F1
11
TestPoint
TP1, TP3, TP4, TP5, TP6, TP7, TP8, TP9 +3
1
~
TP2
6
BAT43
D1, D2, D3, D4, D6, D7
1
1N5819
D5
1
1N4002
D8
1
LED
D9
1
RED LED
D10
7
100uH
L1, L2, L3, L4, L5, L6, L7
7
.1uF
C1, C2, C3, C4, C5, C6, C7
1
220
C8
2
2.2
C9, C10
2
100
R1, R8
7
10K
R2, R3, R4, R5, R6, R7, R9
Show 2 more
QtyPartRefs
1
330
R10
1
470
R11

N1kdo band selector design files

The KiCad project lives in the n1kdo/BandSelector repository on GitHub; these links point at the commit this page was built from.

N1kdo band selector: common questions

What microcontroller does the N1kdo band selector use?

The N1kdo band selector is built around the PicoW, from the RP2040/RP2350 family.

How big is the N1kdo band selector PCB?

The N1kdo band selector measures 105.5 × 77.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the N1kdo band selector?

58 components, from 22 distinct parts. The full bill of materials is listed on this page.

Where can I download the N1kdo band selector design files?

From the n1kdo/BandSelector repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the N1kdo band selector design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which n1kdo chose for the repository.

Can I test firmware for the N1kdo band selector without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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