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docs: faq: Add preface links to "Why boards and shields?" [#22 CR, #11]

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innovaker 2020-06-13 19:49:28 +01:00
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@ -60,6 +60,10 @@ In ZMK, a *shield* is a *PCB* or *hardwired set of components* that when combine
### Why *boards* and *shields*? Why not just “keyboard”?
If you haven't already done so, please read these FAQs first:
- [What is a “board”?](#what-is-a-board)
- [What is a "shield"?](#what-is-a-shield)
When a keyboard accepts a small “PCB MCU module” (e.g. *Arduino Pro Micro*) for its “brains”, then it's important to conceptually separate the hardware into a *board* PCB and a *shield* PCB.
The *shield* is a brainless shell containing all the keys, RGB LEDs, encoders etc. It maps all of these features to a standard pin footprint, such as the Pro Micro pinout.