HardLabs

Minim

matthewdias·minim·PCB/minim.kicad_pcb

Minim PCB layout, top view — open source AVR/Arduino board by matthewdias
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About the Minim PCB

Minim is an open source AVR/Arduino PCB design by matthewdias, published on GitHub under the MIT license. It is a 2-layer board measuring 276.2 × 79.8 mm, with 113 components from 20 distinct parts.

Its main chip is the C44854, from the AVR/Arduino family. Other key parts include the C78442. By type, the board carries 46 LEDs, 9 capacitors, 6 resistors, 2 ICs, 1 crystal and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

A symmetrical 50% keyboard

Main components on the Minim

C44854C78442

Minim bill of materials (BOM)

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

QtyPartRefs
1
C44854
ATmega32U4-AU
U1
1
C78442
PRTR5V0U2X
U2
1
16MHZ
16MHz
Y1
46
D
D_1, D_2, D_3, D_4, D_5, D_6, D_7, D_8 +38
1
500MA
500mA
F1
1
C318884
SW_Push
SW1
1
HRO-TYPE-C-31-M-12
USB1
4
KEYSW
K_1, K_14, K_41, K_45
35
KEYSW
K_2, K_3, K_4, K_5, K_6, K_7, K_8, K_9 +27
2
KEYSW
K_15, K_27
2
KEYSW
K_28, K_39
2
KEYSW
K_42, K_44
1
KEYSW
K_43
2
22PF
22pF
C1, C2
5
0.1UF
0.1uF
C3, C4, C5, C6, C7
1
10UF
10uF
C8
1
1UF
1uF
C9
2
10K
10k
R1, R4
2
22
R2, R3
2
5.1K
5.1k
R5, R6

Minim design files

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

Minim: common questions

What microcontroller does the Minim use?

The Minim is built around the C44854, from the AVR/Arduino family.

How big is the Minim PCB?

The Minim measures 276.2 × 79.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Minim?

113 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 Minim design files?

From the matthewdias/minim repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Minim design in my own project?

Yes, under the terms of its MIT license, which matthewdias chose for the repository.

Can I test firmware for the Minim 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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