Idea

I am trying to set up a battery computer for RVs in order to be able to monitor the current state of the on board battery of my RV. The battery computers which can be bought right now usually offer a small display which has to be put on some fixed location inside your RV. To do so you have to cut some holes which I want to avoid. In some cases it is possible to buy an extra bluetooth extensions which allows to check the current state (almost always only the current state).

Goal

I want to create a battery computer using the nrf51822 as sensing/transmitting device paired with a smarphone app. It should have the following outlines:

• no display, just bluetoth connection to mobile device
• measurement of load (electric current)
• current battery capacity
• battery capacity log
• time left with current load
• ...

Issues

Right now I am struggling with properly setting up a custom service for BLE. > Pretty much done that

Any help is highly appreciated.

S1rl0in aka Raffael