Cherry Mx Breakout Board

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Cherry Mx Breakout Board

Cherry MX Breakout Boards with reverse-mounted addressable RGB LED and hot-swap.

Overview

Cherry MX Breakout Boards

"Buy Me A Coffee"

Two breakout boards designed in KiCad.

Both feature reverse-mounted addressable RGB LED LTST-A683CEGBW.

Both are hot-swap capable (Kailh Socket / Mill-Max 7305).

Total board dimensions: 26 x 19 mm.

Mill-Max 7305 holes are compatible with standalone switches so they can be soldered directly to the board.

SchematicPCB (Kailh Socket)PCB (Mill-Max 7305)

Kailh Socket Renders

Top ViewBottom View

Kailh Socket 3D Model was obtained from QMK. All credits go to them. The exact file can be found here.

Mill-Max 7305 Renders

Top ViewBottom View

Real Photos

Hooking up with Arduino

CodeWiring diagram
#include "FastLED.h"

const int ledPin = 6;
const int buttonPin = 7;

int ledHue = 0;
const int ledSaturation = 255;
const int ledBrightness = 255;

CRGB leds[1];

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  FastLED.addLeds<WS2811, ledPin>(leds, 1);
}

void loop() {
  if(digitalRead(buttonPin) == LOW) ledHue++;

  leds[0].setHSV(ledHue, ledSaturation, ledBrightness);
  FastLED.show();
}

What socket is right for me?

Kailh SocketMill-Max 7305 & 0305
Cost per switch$0.10 on kbdfans.comabout $0.88 on digikey.com
Requires compatible PCB?YesNo
Soldering difficultyBoth socket types are easy to solder and there shouldn't be any problems
General NotesKailh Sockets are much cheaper when it comes to custom builds but require custom PCB. Mill-Max connectors are not as stabilized as they make an extra gap between PCB and switch. Mill-Max 7305 is preferable over 0305, it's thinner so the gap is not that wide. Swapping switches seems easier using Kailh Sockets, Mill-Max connectors tend to bend sockets' pins. In my opinion, Mill-Max connectors should be taken into an account only when you modify pre-existing PCB as they have no advantage over Kailh Sockets and simply cost more

Datasheets

Files in this package

  • CAD source: Kailh_Socket.stp, LTST-A683CEGBW.step, Mill-Max-7305.step
  • Documents: Cherry MX.pdf, Kailh Socket.pdf, LTST-A683CEGBW.pdf, Mill-Max.pdf

Source & license

Imported into the CommunityCAD Archive with attribution preserved. All rights remain with the original author under the stated license.

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From the datasheet

docs/LTST-A683CEGBW.pdf

LITE) II OPTOELECTRONICS ~ pf aC SMD LED Product Data Sheet LTST-A683CEGBW Spec No. : Created Date: 2018/04/17 Revision: (PRELIMINARY)-1.0 BNS-OD-FCOO1/A LITE-ON Technology Corp. / Optoelectronics No.90,Chien 1 Road, Chung Ho, New Taipei City 23585, Taiwan, R.O.C. Tel: 886-2-2222-6181 Fax:…

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docs/Cherry MX.pdf

Sheet 2 of 2 Rev. 00 MX1A-xxNA / MX1A-xxNB SchlieBer 1-polig normally open single pole Sockel natur Deckel transparent socket nature cover transparent EZ SMD-LED Tastenrahmen nur bei MX1A-xxNA face plate at only MX1A-xxNA Mechanische und elektrische Daten siehe Spezifikation : TS - M0050…

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docs/Kailh Socket.pdf

[ f ABIDE BY ROHS (m Specification : @1. Rating: Voltage :12V AC/DC max.,2V DC min. Current: 10mA AC/DC max.,10yA DC min. @2. Contact Resistance : 100mQ Max @3. Insulation Resistance :100MQ at 500V — | @4. Withstand Voltage : AC100V (50-60Hz) for 1 minute 11.30£0.15 @5.Mation Force : 3. Okgf max…

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docs/Mill-Max.pdf

PIN RECEPTACLES FOR .025” - .037” DIAMETER PINS AND .025” SQUARE PINS 1305 1305-0-15-XX-47-XX-04-0 Press-fit in .061 mounting hole 1306 1306-0-15-XX-47-XX-04-0 Press-fit in .061 mounting hole 7305-0-15-XX-47-XX-10-0 Solder mount in .060 min. mounting hole Also available on 8mm wide carrier tape:…

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