Let's start with the connectors. You will normally power the board with a single-cell (3.7V) Lipo
battery, which plugs into the two-pin
"JST" battery connector
. There is a
stereo headphone jack
that you can use to connect the board to a pair of headphones if desired. Connecting headphones
will disable the speakers, but
you can change this behavior if you wish.
(If you'd like to connect the
board to an external amplifier, see the special note
) You can plug a 5V FTDI board or cable
into the 6-pin
5V FTDI header
, to both recharge an attached Lipo battery and to reprogram the
about powering the board from USB). And finally, there is a
micro-
SD card socket
into which you'll insert a micro-SD memory card containing the audio files you want
to play.
The board contains a
power switch
that is used to turn the board on and off. There are also two
LEDs; a
red power LED
that will light up when the board is powered on, and a
yellow charge LED
.
The charge LED will light up when the battery is being charged, and go out when it is full. (It is also
normal for the charge LED to turn on if no battery is attached.) You can charge the battery while the
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