4 layers67 × 98 mm
SJ-201-R6
MycroftAI/hardware-mycroft-mark-II
Mycroft's Mark II Rpi mechanical, electrical and industrial designs
235 parts113
2 layers100 × 50 mm
AltmillSwitchController
plocher/AltmillSwitchController- Size
- 100 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 48
- Pads
- 100
- Tracks, vias
- 87, 13
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Aug 2026
- Updated
- 2 Aug 2026
Overview
AltmillSwitchController is an open-source printed circuit board by plocher, from the plocher/AltmillSwitchController repository on GitHub. It is a 2-layer board of 100 × 50 mm with 23 parts on 48 nets, routed with 87 tracks and 13 vias.
It is built around the 4N28SM, BAT54A and CPC1709J. Its parts include 6 connectors, 5 resistors, 4 diodes, 2 capacitors and 2 ICs. It belongs with the ESP32 boards of this library.
Main components
3
4N28SM
SMD-6P-40℃~+100℃ 1 1.18V 10% 100% 2mA 2us 2us 300mV@0.5mA,10mA 30V 4.17kV 6V Phototransistor SMD-6P Transistor, Photovoltaic Output Optoisolators ROHSonsemiTransistor, Photovoltaic Output Optoisolators
BAT54A
SOT-231 Pair Common Anode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky Diodes
CPC1709J
ISOPLUS-264-40℃~+85℃ 1.42V 10mA 2.5kV 220us 27mΩ 7ms DC ISOPLUS-264 Solid State Relays (MOS Output) ROHSLittelfuse/IXYSSolid State Relays (MOS Output)
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | Conn_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-3-2-5.08_1x02_P5.08mm_Horizontal | J5, J6, J8, J9 |
| 3 | 330R | SPCoast:0603-RES | R1, R2, R9 |
| 3 | Val** | SPCoast:WS2812B | LED6, LED7, LED8 |
| 2 | 4N28SM | Package_DIP:SMDIP-6_W7.62mm | U1, U2 |
| 1 | 1.0uF | SPCoast:0603-CAP | C1 |
| 1 | 1000uF | Capacitor_SMD:CP_Elec_10x10 | C2 |
| 1 | 10K | SPCoast:0603-RES | R3 |
| 1 | 22K | SPCoast:0603-RES | R4 |
| 1 | BAT54A | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | CPC1709J | SPCoast:Relay_CPC1709J | K1 |
| 1 | Conn_6P6C | SPCoast:RJ12_Amphenol_54601-x06_Horizontal | J1 |
| 1 | DCJ0202 | SPCoast:DCJ0202 | J7 |
| 1 | ESP32-DevKit-V1 | SPCoast:ESP32_DevKit_V1 | MCU1 |
| 1 | SW_DPST | SPCoast:SW_Toggle_DPDT.LUGS | SW3 |
| 1 | ~ | SPCoast:Board_100x050 | Board1 |
Questions
How big is the AltmillSwitchController PCB?
It measures 100 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AltmillSwitchController use?
23 parts, built around the 4N28SM, BAT54A and CPC1709J. 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 AltmillSwitchController KiCad files?
From the plocher/AltmillSwitchController repository on GitHub, at the commit this page was made from: the board is AltmillSwitchController.kicad_pcb and its schematic AltmillSwitchController.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AltmillSwitchController design in my own project?
Its repository states no licence, so its author keeps all rights: ask plocher before reusing the design.
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