crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0

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crwdns2933797:0Andrew Optimus Goldheartcrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Andrew Optimus Goldheart

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[* black] We find the source of our board removal strife: A layer of super sticky adhesive, keeping the capacitative board in contact with the plastic upper case.
-[* icon_note] The green grid, though reminiscent of graph paper, is actually a grid of capacitors. A finger in contact with the grid acts as a third capacitor, raising the coupled capacitance. The onboard controller senses both the location of the capacitance change, thus detecting touch. Science!
+[* icon_note] This round green grid is half of an array of capacitors—with the other half buried in another, deeper PCB layer. By measuring the total capacitance of each row and column, the controller can detect when and pinpoint where your finger is modifying the capacity of the grid through capacitative coupling. Science!
[* black] On the backside we find some chips:
- [* red] Atmel [http://www.atmel.com/Images/Atmel-42181-SAM-D21_Datasheet.pdf|ATSAMD21|new_window=true] 32-bit ARM [https://www.arm.com/products/processors/cortex-m/cortex-m0plus.php|Cortex M0+|new_window=true] microcontroller
+ [* red] Atmel [http://www.atmel.com/Images/Atmel-42181-SAM-D21_Datasheet.pdf|ATSAMD21|new_window=true] 32-bit ARM [https://www.arm.com/products/processors/cortex-m/cortex-m0plus.php|Cortex-M0+|new_window=true] microcontroller
[* orange] Two NXP [http://www.nxp.com/products/power-management/lighting-driver-and-controller-ics/i2c-led-display-control/24-channel-fm-plus-ic-bus-57-ma-20-v-constant-current-led-driver:PCA9956BTW|PCA9956BTW|new_window=true] LED drivers