2 layers50.8 × 55.9 mm
2key
maxchaston/keypad
PCB designs, firmware and 3d case models for a prototype 2 button keypad.
24 parts
2 layers50.8 × 55.9 mm
PCB designs, firmware and 3d case models for a prototype 2 button keypad.
- Size
- 50.8 × 55.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 41
- Pads
- 124
- Tracks, vias
- 188, 14
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 31 Jan 2023
- Updated
- 31 Jan 2023
Overview
2key is an open-source printed circuit board by maxchaston, from the maxchaston/keypad repository on GitHub. It is a 2-layer board of 50.8 × 55.9 mm with 24 parts on 41 nets, routed with 188 tracks and 14 vias.
It is built around the ATMEGA32U4-MU. Its parts include 7 capacitors, 4 resistors, 2 diodes, 1 IC and 1 switch. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
atmega32U4-MU_hotswap/README.mdOverview
Designed for use with the smaller profile "MU" version of the atmega32U4. Also features kailh hotswap socket support in place of regular cherry pin pads.
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | , , , | ||
| 3 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C3, C4, C5 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 22pF | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 2 | MX-NoLED | MX_Only:MXOnly-1U-Hotswap | MX1, MX2 |
| 2 | SOD-123 | Diode_SMD:D_SOD-123 | D1, D2 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C7 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 500mA | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | ATmega32U4-M | Package_DFN_QFN:QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm | U1 |
| 1 | Molex-0548190589 | random-keyboard-parts:Molex-0548190589 | USB1 |
| 1 | SW_PUSH | random-keyboard-parts:SKQG-1155865 | SW1 |
Questions
How big is the 2key PCB?
It measures 50.8 × 55.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 2key use?
24 parts, built around the ATMEGA32U4-MU. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the 2key KiCad files?
From the maxchaston/keypad repository on GitHub, at the commit this page was made from: the board is atmega32U4-MU_hotswap/2key.kicad_pcb and its schematic atmega32U4-AU/2key.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 2key design in my own project?
Its repository states no licence, so its author keeps all rights: ask maxchaston before reusing the design.
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