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Mysteripad

piit79·mysteripad

Mysteripad PCB layout, top view — open source AVR/Arduino board by piit79
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About the Mysteripad PCB

Mysteripad is an open source AVR/Arduino PCB design by piit79, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 76.2 × 146.6 mm, with 67 components from 19 distinct parts.

Its main chip is the ATmega328P-PU, from the AVR/Arduino family. By type, the board carries 24 diodes, 8 resistors, 5 capacitors, 1 IC, 1 crystal and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

A through-hole mechanical numpad with an extra row to match the Mysterium keyboard

Mysteripad is a through-hole numeric keyboard (or "numpad") matching the form factor of the Mysterium keyboard) (original), much like the Discipad (original) matches the Discipline (original).

Mysteripad was inspired by (but is not based on) the Discipad by Bryan of cftkb.com.

17-22 keys, 0-4 rotary encoders (6 rows, 4 columns) Hotswappable using Kailh/Gateron hotswap sockets All 4 top row positions support either a switch or an EC11 rotary encoder - 4 encoders can be installed at the same time¹ Optional split 0 support (2x 1u instead of 2u) * TRRS socket for connection to the next 42.…

Mysteripad, from the project README
From the project README

Main components on the Mysteripad

ATmega328P-PU

Mysteripad bill of materials (BOM)

67 components, 19 distinct parts.

QtyPartRefs
1
ATmega328P-PU
U1
1
Crystal
Y1
1
PJ-320A
J1
1
BOOT
BOOT1
4
RotaryEncoder_Switch_Combo
ENC_SWA1, ENC_SWA2, ENC_SWA3, ENC_SWA4
1
500mA
F1
1
RST
RESET1
16
KEYSW
SWB1, SWB2, SWB3, SWB4, SWC1, SWC2, SWC3, SWD1 +8
3
KEYSW
SWC4, SWE4, SWFB1
1
USB_C_GCT_USB4085
USB1
2
3.6V
D1, D2
22
—
D3, D4, D5, D6, D7, D8, D9, D10 +14
1
4.7u
C1
2
0.1u
C2, C3
2
22p
C4, C5
1
1.5K
R1
4
5.1K
R2, R3, R7, R8
2
75R
R4, R5
1
10K
R6

Mysteripad design files

The KiCad project lives in the piit79/mysteripad repository on GitHub; these links point at the commit this page was built from.

Mysteripad: common questions

What microcontroller does the Mysteripad use?

The Mysteripad is built around the ATmega328P-PU, from the AVR/Arduino family.

How big is the Mysteripad PCB?

The Mysteripad measures 76.2 × 146.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mysteripad?

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

Where can I download the Mysteripad design files?

From the piit79/mysteripad repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mysteripad design in my own project?

Yes, under the terms of its GPL-3.0 license, which piit79 chose for the repository.

Can I test firmware for the Mysteripad 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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