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RelaisAddierer

apxco·Kicad·Useless_Relais_Adder/RelaisAddierer/RelaisAddierer.kicad_pcb

RelaisAddierer PCB layout, top view — open source RP2040/RP2350 board by apxco

About the RelaisAddierer PCB

RelaisAddierer is an open source RP2040/RP2350 PCB design by apxco, published on GitHub. It is a 2-layer board measuring 290.1 × 175 mm, with 256 components from 23 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the TCA9534 and uA7805. By type, the board carries 101 resistors, 67 diodes, 34 transistors, 32 relays, 13 capacitors and 4 ICs.

From the project

Kombination aus Mikrocontroller und 8-Bit Relais Addierer.

Kombination aus Mikrocontroller und 8-Bit Relais Addierer.

yC übernimmt die Ansteuerung der beiden Daten Bytes, die über die Relais Addiert werden und sorgt für die Ausgabe.

https://www.youtube.com/watch?v=YAB79SiROqY

04.09.2025 Initiale Idee zum Projekt, Erstellung Schaltbild und Leiterplatte Version 1.0 05.09.2025 Weiter an Leiterplatte, grobe Positionierung der Elemente, erste Schritte bei der Programmierung 06.09.2025 Bauteile zurecht gerückt, klappt nicht gut mit KiCad muss ich sagen. 07.09.2025 Layout steht soweit, keine wesentlichen Änderungen mehr vorgesehen an der Platine, jetzt…

RelaisAddierer, from the project README
From the project README

Main components on the RelaisAddierer

TCA9534uA7805RaspberryPi_Pico

RelaisAddierer bill of materials (BOM)

256 components, 23 distinct parts.

QtyPartRefs
3
TCA9534
U1, U2, U3
1
uA7805
U4
1
RaspberryPi_Pico
A1
16
BC847
Q1, Q2, Q3, Q4, Q5, Q7, Q8, Q10 +8
1
PJM10H01PSA
Q6
15
DMP3099L
Q9, Q11, Q12, Q13, Q14, Q15, Q16, Q22 +7
2
BSS138
Q201, Q202
1
Conn_01x08_Pin
J1
1
Barrel_Jack
J2
32
HK19F-DCxxV-SHC
K201, K202, K203, K204, K205, K206, K207, K208 +24
2
RotaryEncoder_Switch
SW1, SW2
33
1N4148WT
D2, D201, D202, D203, D204, D205, D206, D207 +25
1
1N4007
D9
25
LED
D34, D35, D36, D37, D38, D39, D40, D41 +17
8
BZD27C47
D51, D52, D53, D54, D55, D56, D57, D58
1
1uF
C1
7
100nF
C2, C3, C5, C6, C7, C201, C202
5
470uF
C8, C9, C10, C11, C12
26
10k
R1, R2, R3, R4, R5, R6, R15, R17 +18
41
1k
R7, R8, R9, R10, R35, R36, R37, R38 +33
Show 3 more
QtyPartRefs
32
100R
R11, R12, R13, R14, R16, R18, R20, R21 +24
1
560
R83
1
2,6k
R205

RelaisAddierer design files

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

RelaisAddierer: common questions

What microcontroller does the RelaisAddierer use?

The RelaisAddierer is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the RelaisAddierer PCB?

The RelaisAddierer measures 290.1 × 175 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RelaisAddierer?

256 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the RelaisAddierer design files?

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

Can I use the RelaisAddierer design in my own project?

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

Can I test firmware for the RelaisAddierer 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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