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add a mic, maybe

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commit 734ff109e85973648de8790b679d9d789756c8ac 1 parent e822980
@rambo rambo authored
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  1. +4 −0 hardware/board_rev2/README.md
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4 hardware/board_rev2/README.md
@@ -8,3 +8,7 @@
* In any case [MCP1826T](http://www.digikey.fi/product-detail/en/MCP1826T-3302E%2FDC/MCP1826T-3302E%2FDCCT-ND/1776943) looks like a good choice for regulator (very low drop even at high current) and decent price.
* Consider MCP73837 as alternative LiPo charger
* See http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf
+ * Consider adding a microphone (for sound-sensitive stuff)
+ * http://www.digikey.fi/product-detail/en/CMA-4544PF-W/102-1721-ND/1869981
+ * Remember an op-amp to get usable voltage levels from the mic
+ * Sparkfun has a schematic but it needs changes, check [this comment](https://www.sparkfun.com/products/9964#comment-4f47af0dce395f4713000000) for reminder of freq calculations and adjust R5 to 500k for example
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