HardLabs

Sandy Base

jpskenn·Sandy·PCB/Sandy_Base/Sandy_Base.kicad_pcb

Sandy Base PCB layout, top view — open source AVR/Arduino board by jpskenn

About the Sandy Base PCB

Sandy Base is an open source AVR/Arduino PCB design by jpskenn, published on GitHub under the MIT license. It is a 2-layer board measuring 285 × 95.1 mm, with 153 components from 28 distinct parts.

Its main chip is the ATMEGA32U4-MU, from the AVR/Arduino family. Other key parts include the 24LC64. By type, the board carries 40 diodes, 18 inductors, 10 connectors, 9 capacitors, 8 resistors and 2 ICs.

It belongs with the keyboards designs in this gallery.

From the project

a Keyboard with key height optimization

Sandy is a keyboard with key height optimization.

Layered PCB will make height differences for each key. This covers the lack of optimization to physical key layout that only adjust x-y direction in a plane.

Sandyは、スイッチの配置を立体的にして高さ方向への最適化を加えた、左右対称レイアウトの60%キーボードです。

平面上のキーレイアウトだけでは最適化しきれない部分を、キーの位置に応じてスイッチを配置する高さを変えることで補っています。

キー割り当て書き換えツールRemapがQMKファームウェアのバージョン 0.22.2以降に対応したことに伴い、新しくビルドしたSandyのファームウェアを公開しました。 参考：Remap supports QMK Firmware 0.22.2 or higher

Sandy Base, from the project README
From the project README

Main components on the Sandy Base

ATMEGA32U4-MU24LC64

Sandy Base bill of materials (BOM)

153 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4-MU
ATmega32U4-MU
U1
1
24LC64
U2
1
16MHZ
16MHz
Y1
6
CONN_02X02_TOP_BOTTOM
Conn_02x02_Top_Bottom
J1, J2, J3, J4, J5, J6
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J7
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J8
1
CONN_01X02
Conn_01x02
J9
1
CONN_01X03
Conn_01x03
J10
18
Conn_01x01
EXT_C0, EXT_C1, EXT_C2, EXT_C3, EXT_C4, EXT_C5, EXT_C6, EXT_C7 +10
1
500MA
500mA
F1
1
SOLDERJUMPER_3_OPEN
SolderJumper_3_Open
JP1
3
RotaryEncoder_Switch
RE_L1, RE_L2, RE_R1
1
5.2X5.2MM
5.2x5.2mm
ResetSW1
28
SW_Push
SW_;1, SW_<1, SW_>1, SW_A1, SW_C1, SW_CenterL1u2, SW_CenterR1u2, SW_D1 +20
3
SW_Push
SW_CAPS1u1, SW_CenterC1u1, SW_RIGHT1
4
SW_Push
SW_CTL1.5u1, SW_ENT1.5u1, SW_LSPC1.5u1, SW_RSPC1.5u1
6
SW_Push
SW_CTL1.25u1, SW_ENT1.25u1, SW_LALT1.25u1, SW_LWIN1.25u1, SW_RALT1.25u1, SW_ROPT1.25u1
39
C81598
D
D1, D2, D3, D4, D5, D6, D7, D8 +31
1
PRTR5V0U2X
D99
18
SK6812MINI-E
L1, L2, L3, L4, L5, L6, L7, L8 +10
Show 8 more
QtyPartRefs
1
10UF
10uF
C1
2
22PF
22pF
C2, C3
5
0.1UF
0.1uF
C4, C5, C7, C8, C9
1
1UF
1uF
C6
2
5.1K
5.1k
R1, R2
2
22
R3, R4
2
10K
10k
R5, R6
2
4.7K
4.7k
R8, R9

Sandy Base design files

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

Sandy Base: common questions

What microcontroller does the Sandy Base use?

The Sandy Base is built around the ATMEGA32U4-MU, from the AVR/Arduino family.

How big is the Sandy Base PCB?

The Sandy Base measures 285 × 95.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sandy Base?

153 components, from 28 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 Sandy Base design files?

From the jpskenn/Sandy 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 Sandy Base design in my own project?

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

Can I test firmware for the Sandy Base 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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