DIY MOD - Corsair K70 Keyboard Bluetooth MOD Part2 with Unifying 機械鍵盤無線化

  上次使用藍芽KVM來做無線鍵盤改裝，實際使用起來還是滿多問題的。主要使用的環境在公司工作用的桌電上，WIN7系統+USB藍芽，基本上就是連打字都能感受到明顯的延遲和時不時地斷線。所以我決定走回上篇文章提到的第一種方案，也就是使用Unifying的方式來完成。

  Last time I took a bluetooth on the wireless mechanical keyboard project, but it came out some issues when I was working. My environment is a desktop PC with Windows 7 + USB bluetooth dongle. The main issues are delay when typing and auto disconnection occasionally. So I decide to redo this project again with an Unifying controller.

這次的犧牲品，K375S。可以記憶三裝置和超長的待機時間。
This time I will use K375S, which can remember 3 devices and significant life time.

K375S並沒有做出截圖區的三塊肌，不過實際上MCU的矩陣有提供Scroll Lock和Pause的功能，Print Screen則可以透過FN組合鍵來實現。
K375S has no Scroll Lock, Pause and Print Screen. Acturally the matrix provide Scroll Lock and Pause. The Print Screen can be done by FN combination.

至於要怎麼知到矩陣要怎麼走，其中一個方法就是從這片薄膜上一條一條找... 當然網路上還是有辦法找到矩陣圖的 XD
You can find the matrix by the film. And of course you could find the matrix on the net, lol.

第一步當然就是拆掉全部的軸。
First step, dis-solder all of the switches.

接下來有兩條路可以選，一是切掉PCB上所有軸走出去的線路，二是不使用PCB，直接將新的線路焊在軸腳上。
不幸的是，當我用第一種方式接完線路後，才發現裡面有不少線路我沒有找到。
Then there're two ways for the new circuit. One is cut all of the circuit on the PCB, then wire the new circuit. Two is solder the new circuit on the switches contacts without PCB.
Unfortunately, I found that I missed a lots of circuit were not cut off after rewiring with the first way.

然後我只好再解掉所有的軸一次。
Then I dis-solder all of the switches again.

再把線路直接焊到機械軸腳上。
And wiring directly on the switches contacts.

再透過轉板和FFC接到K375S的主控板上。另外也有在F1~F3焊上LED，作為切換裝置的指示燈。
Connect the wires to K375S controller board through a transfer board and FFC. And also put LEDs on F1 to F3 key as devices switch indicators.

終於完成，測試完所有的案件也都可以正常使用。
Finally, it works.

  手感上因為少了PCB板，敲擊的手感變得有點軟，聲音也小了一些。目前使用上都還滿正常的，畢竟是使用Unifying的主控，只要線路焊接沒問題的話都會很穩定。除了外觀醜了點外，功能性上很讓人滿意，穩定、可以用單一接收器接多個羅技裝置、多裝置切換。
  It feels softer and less noise without PCB. So far, everything's good. Just make sure the wires and solders are good. Except the ugly looking, the functions are awesome, or should say meets my requirements. Stable, multi-devices and switches with 3-devices .