HardLabs

Sentry keyboard

markstory·sentry-keyboard·kicad/sentry-keyboard-v1.kicad_pcb

Sentry keyboard PCB layout, top view — open source AVR/Arduino board by markstory

About the Sentry keyboard PCB

Sentry keyboard is an open source AVR/Arduino PCB design by markstory, published on GitHub under the MIT license. It is a 2-layer board measuring 315 × 121 mm, with 265 components from 97 distinct parts.

Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. By type, the board carries 165 diodes, 13 fuses, 7 capacitors, 4 resistors, 2 connectors and 2 switches.

It belongs with the keyboards designs in this gallery.

From the project

Replacement PCB for the gifted keyboards

A reverse engineered PCB for the keyboard that Sentry gave as holiday gift in 2024.

- Per key RGB LEDs - Rotary encoder with switch - USB host interface connection through picoblade connector. - Programmable keymap with QMK

The firmware directory of this repostiory contains only the files specific to this keyboards firmware, and does not include all of QMK. To build firmware you need to have a copy of QMK (lets assume it is at ~/code/qmk):

Sentry keyboard, from the project README
From the project README

Main components on the Sentry keyboard

ATmega32U4-AU

Sentry keyboard bill of materials (BOM)

265 components, 97 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATmega32U4-AU
U1
1
16Mhz
Y1
1
Conn_01x04
J2
1
AVR-ISP-6
J4
1
K0_0
ESC1
1
K0_1
F1
1
K0_2
F2
1
K0_3
F3
1
K0_4
F4
1
K0_5
F5
1
K0_6
F6
1
K0_7
F7
1
K0_8
F8
1
K0_9
F9
1
K0_10
F10
1
K0_11
F11
1
K0_12
F12
1
K0_13
F13
1
500mA
FU2
1
K1_10
MX0
Show 77 more
QtyPartRefs
1
K1_1
MX1
1
K1_2
MX2
1
K1_3
MX3
1
K1_4
MX4
1
K1_5
MX5
1
K1_6
MX6
1
K1_7
MX7
1
K1_8
MX8
1
K1_9
MX9
1
K3_11
MX'1
1
K1_12
MX+1
1
K4_8
MX,1
1
K1_11
MX-1
1
K4_9
MX.1
1
K4_10
MX/1
1
K3_10
MX;1
1
K2_11
MX[1
1
K2_13
MX\1
1
K2_12
MX]1
1
K3_1
MXa1
1
K5_2
MXalt1
1
K4_5
MXb1
1
K1_13
MXbksp1
1
K4_3
MXc1
1
K3_0
MXcaps1
1
K5_0
MXctrl1
1
K3_3
MXd1
1
K5_8
MXdown1
1
K2_3
MXe1
1
K5_10
MXend1
1
K3_12
MXenter1
1
K3_4
MXf2
1
K5_5
MXfn1
1
K3_5
MXg1
1
K3_6
MXh1
1
K5_11
MXhome1
1
K2_8
MXi1
1
K3_7
MXj1
1
K3_8
MXk1
1
K3_9
MXl1
1
K5_7
MXleft1
1
K4_0
MXlshift1
1
K4_7
MXm1
1
K4_6
MXn1
1
K2_9
MXo1
1
K2_10
MXp1
1
K5_12
MXpgdn1
1
K4_13
MXpgup1
1
K2_1
MXq1
1
K2_4
MXr1
1
K5_4
MXralt1
1
K5_6
MXrctrl1
1
K5_9
MXright1
1
K4_11
MXrshift1
1
K3_2
MXs1
1
K5_3
MXspace1
1
K5_1
MXsuper1
1
K2_5
MXt1
1
K2_0
MXtab1
1
K1_0
MXtilde1
1
K2_7
MXu1
1
K4_12
MXup1
1
K4_4
MXv1
1
K2_2
MXw1
1
K4_2
MXx1
1
K2_6
MXy1
1
K4_1
MXz1
1
Reset
SW1
1
RotaryEncoder_Switch
SW2
83
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +75
82
SK6812
D83, D84, D85, D86, D87, D88, D89, D90 +74
2
22pF
C1, C2
1
1uF
C3
3
0.1uF
C4, C5, C6
1
10uF
C7
2
10k
R1, R8
2
22
R6, R7

Sentry keyboard design files

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

Sentry keyboard: common questions

What microcontroller does the Sentry keyboard use?

The Sentry keyboard is built around the ATmega32U4-AU, from the AVR/Arduino family.

How big is the Sentry keyboard PCB?

The Sentry keyboard measures 315 × 121 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sentry keyboard?

265 components, from 97 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 Sentry keyboard design files?

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

Can I use the Sentry keyboard design in my own project?

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

Can I test firmware for the Sentry keyboard 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.

Similar boards