Here's the source of our board removal strife: A layer of super sticky adhesive, keeping the capacitive board in contact with the plastic upper case.
This side of the board also hosts an array of 12 status LEDs.
On the backside we find some chips:
Two NXP PCA9956BTW LED drivers
Ambient Light Sensor
|[* black] Here's the source of our board removal strife: A layer of super sticky adhesive, keeping the capacitive board in contact with the plastic upper case.|
|[* icon_note] This [http://www.mouser.com/ds/2/42/gpio_module_datasheet-768579.pdf|round green grid|new_window=true] 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. [https://en.wikipedia.org/wiki/Capacitive_sensing|Science|new_window=true]!|
|[* red] This side of the board also hosts an array of 12 status LEDs.|
|[* 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|
|[* 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|
|[* yellow] Two InvenSense [https://www.invensense.com/products/digital/inmp621/|INMP621|new_window=true] MEMS microphones—will only two be enough compared to the [guide|33953|Echo's|stepid=79355|new_window=true] seven?|
|+||[* green] Ambient Light Sensor|