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RelaisAdderII

apxco·Kicad·Useless_Relais_Adder2/RelaisAdderII.kicad_pcb

RelaisAdderII PCB layout, top view — open source AVR/Arduino board by apxco

About the RelaisAdderII PCB

RelaisAdderII is an open source AVR/Arduino PCB design by apxco, published on GitHub. It is a 2-layer board measuring 183.3 × 105 mm, with 160 components from 22 distinct parts.

Its main chip is the Arduino_Nano_Every, from the AVR/Arduino family. Other key parts include the 74HC595. By type, the board carries 71 resistors, 55 diodes, 10 capacitors, 9 transistors, 7 ICs and 4 relays.

From the project

Mikrocontroller und Relais Addierer für 16 bit Zahlen.

Mikrocontroller und Relais Addierer für 16 bit Zahlen.

yC übernimmt die Ansteuerung der beiden Daten Bytes, serieller Eingang der Bits über Schieberegister in einen Relaisaddierer.

02.12.2025 Ei verbessertes Model zur 1. Version muss her, erste Überlegungen zur Umsetzung 06.12.2025 Anlage Ordners struktur, wir bauen die Ordnerstruktur auf den bekannten Addierer auf 10.12.2025 Probleme mit Wayland und Kicad, keine Lösung in Sicht, werde keinen anderen Displayserver verwenden. Überlegungen zu nötigen Anzahl der Pins und zum Microcontroler, es soll kein PiPico werden. Am besten auch kein…

Main components on the RelaisAdderII

74HC595Arduino_Nano_Every

RelaisAdderII bill of materials (BOM)

160 components, 22 distinct parts.

QtyPartRefs
7
74HC595
U2, U3, U4, U5, U6, U7, U8
1
Arduino_Nano_Every
A2
3
PJM10H01PSA
Q2, Q7, Q9
1
DMP3099L
Q3
3
BC847
Q4, Q6, Q10
1
SL2328A
Q5
1
BSS138
Q8
1
Conn_01x08_Pin
J1
1
USB_C_Receptacle_PowerOnly_6P
J2
4
HK19F-DCxxV-SHC
K2, K3, K4, K5
1
SW_Push
SW2
49
LED
D2, D3, D4, D5, D6, D7, D8, D9 +41
2
BZD27C47
D35, D40
4
1N4148WT
D36, D37, D38, D39
7
100nF
C2, C6, C7, C9, C10, C11, C12
3
470uF
C3, C4, C5
50
1k
R2, R8, R9, R10, R11, R12, R13, R14 +42
9
100R
R3, R5, R6, R7, R26, R28, R29, R50 +1
7
10k
R4, R27, R47, R49, R51, R69, R72
1
5k
R25
Show 2 more
QtyPartRefs
2
100
R46, R48
2
5.1k
R70, R71

RelaisAdderII design files

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

RelaisAdderII: common questions

What microcontroller does the RelaisAdderII use?

The RelaisAdderII is built around the Arduino_Nano_Every, from the AVR/Arduino family.

How big is the RelaisAdderII PCB?

The RelaisAdderII measures 183.3 × 105 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RelaisAdderII?

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

Where can I download the RelaisAdderII 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 RelaisAdderII 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 RelaisAdderII without the hardware?

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

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