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Main

rhinocerose·eurorack-designs·dots-main/kicad_main/main.kicad_pcb

Main PCB layout, top view — open source AVR/Arduino board by rhinocerose

About the Main PCB

Main is an open source AVR/Arduino PCB design by rhinocerose, published on GitHub. It is a 2-layer board measuring 30 × 110.5 mm, with 49 components from 20 distinct parts.

Its main chip is the ATmega328P-AU, from the AVR/Arduino family. Other key parts include the AMS1117-5.0. By type, the board carries 22 resistors, 12 capacitors, 10 diodes, 2 ICs, 2 connectors and 1 crystal.

It belongs with the audio designs in this gallery.

From the project

If you have any questions, feel free to contact the creator. This is a hobby project, and the creator is a web developer, not a professional hardware embedded systems builder; some hardware design or code decisions may seem unconventional.

If you have any questions, feel free to contact the creator. This is a hobby project, and the creator is a web developer, not a professional hardware embedded systems builder; some hardware design or code decisions may seem unconventional.

Special thanks to HAGIWO for providing foundational knowledge.

Main components on the Main

ATmega328P-AUAMS1117-5.0

Main bill of materials (BOM)

49 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATmega328P-AU
U1
1
AMS1117-5.0
U2
1
Crystal_GND24
Y1
1
Conn_02x05_Odd_Even
J1
1
Conn_02x03_Odd_Even
J10
1
1N5819WS
D1
1
LED
D2
8
BAT54S
D3, D4, D6, D7, D8, D12, D13, D14
5
C 100nF
C1, C2, C3, C4, C7
2
C 20pF
C5, C6
2
C 10uf
C8, C9
1
C 220pF
C10
2
C 10nF
C11, C12
1
R 1K5
R1
9
R 470
R2, R4, R7, R8, R9, R13, R14, R15 +1
2
R 100k
R3, R5
1
R 470Ohm
R6
6
R 33k
R10, R11, R12, R16, R17, R18
2
R 3K3
R19, R20
1
R 10K
R22

Main design files

The KiCad project lives in the rhinocerose/eurorack-designs repository on GitHub; these links point at the commit this page was built from.

Main: common questions

What microcontroller does the Main use?

The Main is built around the ATmega328P-AU, from the AVR/Arduino family.

How big is the Main PCB?

The Main measures 30 × 110.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Main?

49 components, from 20 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 Main design files?

From the rhinocerose/eurorack-designs 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 Main design in my own project?

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

Can I test firmware for the Main 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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