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Here are the slides from Rob Faludi's XBee lecture:
Notes and Lab for MIDI. The Lab is not required, but you can do it for extra creadit:
In case you're curious:
To calculate the value for a current limiting resistor for an LED: R = (Vs - Vf) / If
Vs = your source Voltage (usually 5 Volts for pcomp class).
Vf = the typical LED forward Voltage, find that in the LED's data sheet.
If = the typical LED forward Current, find that in the LED's data sheet.
info on snubbers in general: http://en.wikipedia.org/wiki/Snubber
info on snubber diodes: http://en.wikipedia.org/wiki/Flyback_diode