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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.
| Schematic | PCB (Kailh Socket) | PCB (Mill-Max 7305) |
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| Top View | Bottom View |
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Kailh Socket 3D Model was obtained from QMK. All credits go to them. The exact file can be found here.
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| Code | Wiring diagram |
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#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();
}
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| Kailh Socket | Mill-Max 7305 & 0305 | |
| Cost per switch | $0.10 on kbdfans.com | about $0.88 on digikey.com |
| Requires compatible PCB? | Yes | No |
| Soldering difficulty | Both socket types are easy to solder and there shouldn't be any problems | |
| General Notes | Kailh 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 | |