We are group of internet of things enthusiasts that love hacking together different devices. In doing multiple arduino-based projects (check our our current project at http://doteverything.co/), we've learned some valuable insights that we want to share back with the arduino community.
Our primary area of focus right now is bluetooth based arduino projects, so we wrote a guide on how to add bluetooth 4.0 capability to any arduino project.
Check it out at doteverything.co. You can also find this guide on instructables: http://www.instructables.com/id/Adding-Bluetooth-40-to-Your-Arduino-Project-IoT-Co/. Email us at team@doteverything.co if you have any questions or need any help, or just leave a comment!