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4 layers38 × 45.3 mmSolo Mini Controller, the printed circuit board in 3D

Solo Mini Controller

sullyjason/interactiles1

Interactive LED button grids that connect two locations over MQTT — press a button in one place, see it light up in the other. ESP32 + NeoPixel switch hardware, KiCad designs, and firmware.

Size
38 × 45.3 mm
Copper layers
4
Thickness
1.6 mm
Parts
36
Nets
70
Pads
266
Tracks, vias
240, 31
Pours
3
Routed
Yes
KiCad
KiCad 8.0 (file 20240108)
Created
8 Jul 2024
Updated
4 Oct 2026

Overview

Solo Mini Controller is an open-source printed circuit board by sullyjason, from the sullyjason/interactiles repository on GitHub. It is a 4-layer board of 38 × 45.3 mm with 36 parts on 70 nets, routed with 240 tracks and 31 vias.

It is built around the BSS138. Its parts include 7 connectors, 3 resistors, 2 capacitors, 2 ICs and 2 switches. It belongs with the lEDs and displays and home automation and IoT boards and the ESP32 and SAM D and SAM boards of this library.

Main components

1

README

Button_Modules/Mini/Mini_Module/README.md

Mini Module PCB

3×5 grid of TL1 NeoPixel switches (7.5mm² each). 4-layer board with MCP23017 I/O expander mounted directly on the underside. Pinout is non-obvious due to space constraints — refer to schematic.

Board

Board

Bodges

Parts

36
QtyValueFootprintReferences
15PLB_RGB_SWSilvansFootprintLibrary:TL1_RBG_Adressable_1_miniRGB_SW1, RGB_SW2, RGB_SW3, RGB_SW4, RGB_SW5, RGB_SW6, RGB_SW7, RGB_SW8, RGB_SW9, RGB_SW10, RGB_SW11, RGB_SW12, RGB_SW13, RGB_SW14, RGB_SW15
210kResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR2, R3
2PINHD_1x2_FemaleConnector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_VerticalJ2, J3
2R_Pack04Resistor_SMD:R_Array_Convex_4x0603RN2, RN3
10.1uFCapacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolderC2
110uFCapacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolderC1
1330ohmResistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolderR1
1BSS138Package_TO_SOT_SMD:SOT-23Q1
1JST_02Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_HorizontalJ6
1JST_02Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_VerticalJ1
1LEDLED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolderD1
1MCP23017_SSPackage_SO:SSOP-28_5.3x10.2mm_P0.65mmU2
1MountingHoleMountingHole:MountingHole_2.2mm_M2_DIN965_PadH2
1PINHD_1x2_FemaleConnector_PinHeader_1.27mm:PinHeader_1x02_P1.27mm_VerticalJ8
1PINHD_1x2_MaleConnector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ9
1PINHD_1x3_MaleConnector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_VerticalJ5
1SW_DIP_x05Button_Switch_SMD:SW_DIP_SPSTx05_Slide_KingTek_DSHP05TJ_W5.25mm_P1.27mm_JPinSW2
1SeeeduinoXIAOSeeed Xiao:Seeeduino XIAO-MOUDLE14P-2.54-21X17.8MMU1
1Slide_Switch_SPDT_P3mm_10x5x10mmButton_Switch_SMD:SW_SPDT_PCM12SW1

Questions

How big is the Solo Mini Controller PCB?

It measures 38 × 45.3 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Solo Mini Controller use?

36 parts, built around the BSS138. 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 Solo Mini Controller KiCad files?

From the sullyjason/interactiles repository on GitHub, at the commit this page was made from: the board is Button_Modules/Mini/Solo_Mini_Controller/Solo_Mini_Controller.kicad_pcb and its schematic 2x2 Interactiles/PCB/Controller PCB/RGB 2x2 with WS2811.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Solo Mini Controller design in my own project?

Its repository states no licence, so its author keeps all rights: ask sullyjason before reusing the design.

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