This is the cheapest and simple way for doing the Lightsaber sound and LED. I have made some mistake on creating the WT588D as am new in this program, but the pin layot and connection in the schematic is correct. And of course you can build a smaller board. This is just a sample.
The WT588D is using "Three Line Serial Mode" and of course you will need the arduino code for that as well. I am not expert in programming, so my code is simple but as long as it given me what i wanted.
Need detail can drop me an email. It's free, just sharing for fun.
May the force be with you.