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The PRIZM Sound Board User's Manual
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Owners.
14
Animated Accent LEDs
There are many ways to “pimp” your saber hilt using additional small LEDs further
referred in this document as
Accent LEDs
.
Petit Crouton features a 32 stage sequencer that allows the user to setup a blinking
animated sequence for up to 7 LEDs. The board outputs 3.3V / 18mA max per accent
LED pad. User must ensure the used accent LEDs have a forward voltage (Vf) lower or
equal to 3.3V.
Accent LEDs Resistor Footprints
Accent LEDs PADs
Accent LEDs
Ground Return
As a space saver PC embeds the footprints for SMT resistors. The footprint is made for
0603 resistors.
To install those resistors on the board, pre-tin one pad only, then grab the resistor
with a pair of sharp tweezers, slide it against the pre-tinned pad, heat up the joint,
wait for it to cool down, then solder the other side of the resistor.
If the user prefers to use classic resistor with leads, the SMT footprint must be
bridged: tin both pads first then add a bit of solder while the soldering iron tip is right
in the middle of the pads. Some stripped wrapping wire can also be used to achieve
the bridged connection.
On the picture above, the red arrows point to the positive pads of the accent leds, use
small gauge wire to send those signals to the positive of the LEDs. Flat/Ribbon cable
can be very handy for that purpose. Then all negatives of the LEDs return to a single
pad pointed by the blue arrow (ground return). The main negative of the board can
be also used as the accent led ground return.
Calculating resistors for LEDs
R = (Vsupply – Vled) / LedCurrent
In our case, Vsupply is the voltage the board provides to power the accent LEDs, ie
3.3V. The Vled is the forward voltage of the LED, usually referred as Vf in the