HardLabs

UT47.2

IndianBoy42·keyboard-pcbs·UT47.2/UT47.2.kicad_pcb

UT47.2 PCB layout, top view — open source AVR/Arduino board by IndianBoy42

About the UT47.2 PCB

UT47.2 is an open source AVR/Arduino PCB design by IndianBoy42, published on GitHub. It is a 2-layer board measuring 238.1 × 76.2 mm, with 128 components from 20 distinct parts.

Its main chip is the ATMEGA32U2-AU, from the AVR/Arduino family. Other key parts include the PRTR5V0U2X. By type, the board carries 47 diodes, 6 capacitors, 6 resistors, 2 ICs, 1 crystal and 1 fuse.

It belongs with the keyboards designs in this gallery.

From the project

Files for my keyboard PCBs, derived or original

The design is inspired by 40percent.club's Gnap keyboard, which is licensed under CC BY-SA 4.0.

UT47.2, from the project README
From the project README

Main components on the UT47.2

ATMEGA32U2-AUPRTR5V0U2X

UT47.2 bill of materials (BOM)

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

QtyPartRefs
1
ATMEGA32U2-AU
U1
1
PRTR5V0U2X
U2
1
16MHZ
16MHz
Y1
8
0.1U
0.1u
CR1, CR2, CR3, CR4, CR5, CR6, CR7, CR8
1
500MA
500mA
F1
40
MX-1U
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +32
2
MX-1.5U
MX12, MX25
4
MX-1.25U
MX13, MX24, MX41, MX43
1
MX-2U
MX42
8
WS2812B
VAL**
RGB1, RGB2, RGB3, RGB4, RGB5, RGB6, RGB7, RGB8
1
SW_PUSH
SW1
1
HRO-TYPE-C-31-M-12
USB1
47
SOD-123
D1, D2, D3, D4, D5, D6, D7, D8 +39
2
22P
22p
C1, C2
1
1UF
1uF
C3
2
0.1U
0.1u
C4, C5
1
4.7U
4.7u
C6
2
10K
10k
R1, R5
2
22
R2, R3
2
5.1K
5.1k
R4, R6

UT47.2 design files

The KiCad project lives in the IndianBoy42/keyboard-pcbs repository on GitHub; these links point at the commit this page was built from.

UT47.2: common questions

What microcontroller does the UT47.2 use?

The UT47.2 is built around the ATMEGA32U2-AU, from the AVR/Arduino family.

How big is the UT47.2 PCB?

The UT47.2 measures 238.1 × 76.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UT47.2?

128 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 UT47.2 design files?

From the IndianBoy42/keyboard-pcbs repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the UT47.2 design in my own project?

The repository has no license, so all rights stay with IndianBoy42. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the UT47.2 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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