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Youll need a WS2812B Led. The ones I used were on a breakout board like this, but you could cut one off from a strip and solder to that.https://www.amazon.com/ALITOVE-100pcs-WS2812B-Addressable-Module/dp/B00P2GQUYC/ref=mp_s_a_1_8?keywords=ws2812b&qid=1557955549&s=gateway&sprefix=ws281&sr=8-8The board is a digispark clone, like this one. https://www.amazon.com/Frentaly®-Digispark-Kickstarter-Attiny85-Development/dp/B0179Z758I/ref=mp_s_a_1_15?keywords=attiny85&qid=1557955902&s=gateway&sprefix=attiny&sr=8-15Any CHERRY MX compatible switch and keycaps will work.As for the second question, yeah, thats certainly possible. I wrote that sketch a while ago, but it should be simple to modify it to send multiple keycodes. Look into the DigiKeyboard library for that,...

Youll need a WS2812B Led. The ones I used were on a breakout board like this, but you could cut one off from a strip and solder to that.https://www.amazon.com/ALITOVE-100pcs-WS2812B-Addressable-Module/dp/B00P2GQUYC/ref=mp_s_a_1_8?keywords=ws2812b&qid=1557955549&s=gateway&sprefix=ws281&sr=8-8The board is a digispark clone, like this one. https://www.amazon.com/Frentaly®-Digispark-Kickstarter-Attiny85-Development/dp/B0179Z758I/ref=mp_s_a_1_15?keywords=attiny85&qid=1557955902&s=gateway&sprefix=attiny&sr=8-15Any CHERRY MX compatible switch and keycaps will work.As for the second question, yeah, thats certainly possible. I wrote that sketch a while ago, but it should be simple to modify it to send multiple keycodes. Look into the DigiKeyboard library for that, it should more or less be as simple as copying and pasting the function that sends the keystroke. The library also has a function to send a string of text as well.This might be of interest to you. The board is seen as a regular HID device, like any keyboard, so you can send whichever, and as many keys as you like. https://youtu.be/fGmGBa-4cYQ