This project is meant to improve climbing safety through improving communication. Communicating with your partner is vital, but this tool is no substitute for good judgement and situational awareness. This software comes with no warranty, expressed implicitly or otherwise. Licensed under GPL. This project is open source and free.
Arduino wiring diagrams are under construction. I will commit these soon. As for the arduino libraries used, both virtualwire and software serial are self-explanatory. Between the library documentation and the .ino file, you should be able to figure out the wiring for the project quickly. I used an Arduino Pro Mini, and the rest of my parts (RF Transmitter/Receiver) and bluetooth module were purchased from Sparkfun and Adafruit.