HardLabs

Sg75

carrizo93·sg75·hardware/sg75.kicad_pcb

Sg75 PCB layout, top view — open source AVR/Arduino board by carrizo93

About the Sg75 PCB

Sg75 is an open source AVR/Arduino PCB design by carrizo93, published on GitHub under the MIT license. It is a 2-layer board measuring 314.3 × 123.8 mm, with 181 components from 19 distinct parts.

Its main chip is the ATmega32U4-A, from the AVR/Arduino family. By type, the board carries 83 diodes, 7 capacitors, 4 resistors, 2 switches, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

A custom low-profile 75% mechanical keyboard. Work in progress.

Main components on the Sg75

ATmega32U4-A

Sg75 bill of materials (BOM)

181 components, 19 distinct parts.

QtyPartRefs
1
ATmega32U4-A
U1
1
16MHz
Y1
1
781710004
J1
71
~
MX1, MX2, MX7, MX8, MX9, MX10, MX11, MX13 +63
2
~
MX3, MX77
2
~
MX4, MX67
2
~
MX5, MX72
3
~
MX6, MX12, MX18
1
~
MX34
1
~
MX76
1
PEC11R-4215F-S0024
Bourns Inc.
S1
1
SW_Push
SW1
83
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +75
1
1uF
C1
3
0.1uF
C2, C3, C4
1
10uF
C5
2
22pF
C6, C7
2
10k
R1, R4
2
22
R2, R3

Sg75 design files

The KiCad project lives in the carrizo93/sg75 repository on GitHub; these links point at the commit this page was built from.

Sg75: common questions

What microcontroller does the Sg75 use?

The Sg75 is built around the ATmega32U4-A, from the AVR/Arduino family.

How big is the Sg75 PCB?

The Sg75 measures 314.3 × 123.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sg75?

181 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sg75 design files?

From the carrizo93/sg75 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Sg75 design in my own project?

Yes, under the terms of its MIT license, which carrizo93 chose for the repository.

Can I test firmware for the Sg75 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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