Sandy 3in1
About the Sandy 3in1 PCB
Sandy 3in1 is an open source AVR/Arduino PCB design by jpskenn, published on GitHub under the MIT license. It is a 2-layer board measuring 302.5 × 230.7 mm, with 241 components from 37 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 79 LEDs, 76 diodes, 16 connectors, 8 resistors, 7 capacitors 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
Main components on the Sandy 3in1
Sandy 3in1 bill of materials (BOM)
241 components, 37 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATMEGA32U4-MU ATmega32U4-MU | QFN-44-1EP_7x7mm_Pitch0.5mm | U1 |
| 1 | 24LC64 | SO-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | 16MHZ 16MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | CONN_02X02_TOP_BOTTOM USB_C_Receptacle_USB2.0 | USB_C_Receptacle_GCT_USB4085 | J1 |
| 1 | CONN_02X02_TOP_BOTTOM Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | CONN_02X02_TOP_BOTTOM Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | CONN_02X02_TOP_BOTTOM Conn_02x03_Odd_Even | PinHeader_2x03_P2.54mm_Vertical | J4 |
| 1 | CONN_02X02_TOP_BOTTOM Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J6 |
| 1 | USB_C_RECEPTACLE_USB2.0 Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J7 |
| 1 | CONN_02X03_ODD_EVEN Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J8 |
| 1 | CONN_01X02 Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J9 |
| 1 | CONN_01X03 Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J10 |
| 7 | Conn_02x02_Top_Bottom | JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal_wCable_housing_spare_pin | J12, J13, J14, J15, J23, J24, J25 |
| 42 | Conn_01x01 | TestPoint_THTPad_D2.0mm_Drill1.0mm | EXT_C0, EXT_C1, EXT_C2, EXT_C3, EXT_C4, EXT_C5, EXT_C6, EXT_C7 +34 |
| 1 | 500MA 500mA | Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 2 | SolderJumper_3_Open | SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm_NumberLabels | JP_LED1, JP_LED2 |
| 1 | 5.2X5.2MM 5.2x5.2mm | SW_SPST_TL3342 | ResetSW1 |
| 2 | JS5208 | SW_JS5208_add_MP_hole | S1, S2 |
| 4 | RotaryEncoder_Switch | RotaryEncoder_Alps_EC11K-Switch_Vertical_H20mm_NPTH_MP | SW_RE_L1, SW_RE_L2, SW_RE_R1, SW_RE_R2 |
| 4 | SK6812MINI | LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm_TriangleMark_Thick | LED1, LED2, LED3, LED4 |
Show 17 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 60 | SW_Push | MXOnly-1U-NoLED | SW_1, SW_2, SW_3, SW_4, SW_5, SW_6, SW_7, SW_8 +52 |
| 4 | SW_Push | MXOnly-1.5U-NoLED | SW_BS1.5u1, SW_CTL1.5u1, SW_ENT1.5u1, SW_TAB1.5u1 |
| 7 | SW_Push | MXOnly-1.25U-NoLED | SW_CTL1.25u1, SW_ENT1.25u1, SW_LALT1.25u1, SW_LWIN1.25u1, SW_RALT1.25u1, SW_ROPT1.25u1, SW_TAB1.25u1 |
| 1 | SW_Push | MXOnly-1.75U-NoLED | SW_LSFT1.75u1 |
| 1 | SW_Push | MXOnly-2U-NoLED | SW_LSFT2u1 |
| 2 | SW_Push | MXOnly-2U-ReversedStabilizers-NoLED | SW_LSPC2u1, SW_RSPC2u1 |
| 38 | C81598 D | D_SOD-123 | D1, D2, D3, D4, D5, D6, D7, D8 +30 |
| 1 | C81598 PRTR5V0U2X | SOT-143 | D10 |
| 37 | D | D_SOD-123 | D40, D41, D42, D43, D44, D45, D46, D47 +29 |
| 1 | 10UF 10uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 2 | 22PF 22pF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2, C3 |
| 3 | 0.1UF 0.1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C4, C5, C7 |
| 1 | 1UF 1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C6 |
| 2 | 5.1K 5.1k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2 |
| 2 | 22 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3, R4 |
| 2 | 10K 10k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R6 |
| 2 | 4.7K 4.7k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9 |
Sandy 3in1 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 3in1: common questions
What microcontroller does the Sandy 3in1 use?
The Sandy 3in1 is built around the ATMEGA32U4-MU, from the AVR/Arduino family.
How big is the Sandy 3in1 PCB?
The Sandy 3in1 measures 302.5 × 230.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Sandy 3in1?
241 components, from 37 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 3in1 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 3in1 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 3in1 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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