I have been meaning to make this post for some time as I always struggled to find clear and easy to follow instructions on how to build an xDrip or xBridge devices. For me battery life and size are key, therefore this build uses a high capacity battery and fits a small form factor of a Tic Tac box.

These devices listen out for the signal from a Dexcom G4 CGM and relay via Bluetooth to your mobile phone with the xDrip app installed. xDrip is my CGM source that I sync directly to HAPP and Nightscout.

I have now been using HAPP as a usable Open Loop artificial pancreas notification system for over 5 months. Reviewing my time with HAPP, in summary I have found...