Hardware Reference
In-Depth Information
Around the edge of the 1.75 -diameter circuit board, you'll see
14 gold pads with holes in them. Each pad is labeled with its
function, whether it's connected to a pin of the microcontroller
or supplies power or ground. You can refer to the numbered
pads when writing your programs, as they'll be connected to
outputs (things like color-changing LEDs) or inputs (things like
sensors). FLORA is designed to put the most commonly used
pads all in a convenient order, with data lines interleaved with
power and ground. This makes it easy to connect to other com-
ponents without crossing any conductive thread traces.
Just below the Atmega32u4 chip, FLORA has a small but easy to
use onboard reset button to reboot the system. To the left of the
microcontroller chip is the small on/off switch, which controls
the battery power only. If you plug in USB, it will always power
the board regardless of whether the switch is on or of.
FLORA has USB HID (human interface device) support, so it can
act like a mouse or keyboard, which makes it perfect for making
soft controllers for computer games, or for connecting directly
to cellphones or tablets that support USB keyboards and mice.
Figure 3-3. Pinout diagram including alternate functions for
each of the pins on the FLORA
FLORA has four indicator LEDs on the circuit board: power good
(green), digital signal LED for bootloader feedback (red), and
data transmission/reception (TX/RX, yellow). The six interior
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