To switch between "track" and "volume" modes,
hold the rotary encoder button down
for one second
until the color changes. Red = track mode, green = volume mode.
In track mode, you can turn the knob forwards or backwards to change tracks (one track
per "click" of the knob). If you're currently playing, turning the knob will stop the current
track, switch to the next / previous one, and start the new track. If you're not playing, the
player will silently keep track of how many clicks you've made. If you click more than the
number of tracks on the card, it will loop around to the beginning.
In volume mode, you can turn the knob forwards or backwards to change the volume.
11. To charge the battery or reprogram the board, connect a 5 volt FTDI board or cable to the
FTDI header. The yellow LED will light up while the battery is charging and go out when it's
full.
12. Have fun!
Hardware Details and Hacking Tips
Power options and hacks
You can power the LilyPad MP3 Player in several ways:
Lipo battery
The easiest option is to use a Lipo (Lithium-Polymer) battery. SparkFun carries these in
, which translates into different run times.
It is recommended that you use a Lipo battery of at least 500mAh, to match the default 500mA rate
of the built-in Lipo charger (this is also the maximum current available from most USB ports).
SparkFun Lipo batteries have a maximum charge rate of 1C, which means you shouldn't charge
them faster than one hour. 500mA will charge a 500mAh battery in one hour, a 1000mAh battery in
two hours, etc. A battery smaller than 500mAh would charge in less than one hour, which could
cause the battery to overheat and possibly be damaged.
Unregulated 3.7V to 6V source
If you have an external 3.7V to 6V source, you have two options:
If you want to use your power source to recharge an attached Lipo battery, you can attach it to the
"VIN" sew tap. Note that to recharge a battery the voltage must be greater than 4.5V (but still less
than 6V).
If you want to use your power source to run the LilyPad MP3 Player directly (without a battery),
connect it to the JST battery connector or the headers directly behind it. SparkFun carries
(a
connector with bare wires) that match this connector. Note that if you connect a 5V FTDI to the
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