HardLabs

One key

ahtn·keyboard_pcb·one_key_v2/one-key.kicad_pcb

One key PCB layout, top view — open source Silicon Labs board by ahtn

About the One key PCB

One key is an open source Silicon Labs PCB design by ahtn, published on GitHub. It is a 2-layer board measuring 14.5 × 14.5 mm, with 10 components from 9 distinct parts.

Its main chip is the MCP73832T-2ACI/OT, from the Silicon Labs family. By type, the board carries 4 connectors, 4 capacitors, 1 IC and 1 switch.

It belongs with the keyboards designs in this gallery.

One key, from the project README
From the project README

Main components on the One key

MCP73832T-2ACI/OT

One key bill of materials (BOM)

10 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP73832T-2ACI/OT
EFM8UB1_QFN20
U1
1
670-2849-1
USB_OTG
J1
1
670-2849-1
Conn_01x04
J2
2
Conn_01x04
J3, J4
1
401-2001
SW_Push
SW1
1
4.7UF
0.1uF
C1
1
4.7UF
4.7uF
C2
1
1UF
0.1uF
C3
1
1UF
4.7uF
C4

One key design files

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

One key: common questions

What microcontroller does the One key use?

The One key is built around the MCP73832T-2ACI/OT, from the Silicon Labs family.

How big is the One key PCB?

The One key measures 14.5 × 14.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the One key?

10 components, from 9 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 One key design files?

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

Can I use the One key design in my own project?

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

Can I test firmware for the One key without the hardware?

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

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