Yesterday I worked with Michel from the A&T lab to discover what was wrong with my Bluetooth connection. It was interesting to see how Michel went about it:

• We first tried to get data from the set up as it was. Nothing happened just like last week.
• We then used another Arduino to check of we could connect to the Bluetooth module. With the Mac software CoolTerm we verified that data was send over Bluetooth.
• When this was the case we tried my code. The was an error with the Wire library. We commented out that bit of code and tested it and for the first time since a long time I saw the formatted string with sensor values.
• The next step was to test the code on the Arduino mini in the wearable. Michel made sure the TR and TX wires were crossed. Still nothing happened.
• We then replaced the rechargeable batteries with the 9 volt battery Michel had used. It worked in CoolTerm!
• I started the test AQAb app on my Android and yes! a nice formatted string appeared on the screen.

To conclude I think the problem was a mixture of problems: wrong wiring, an error in the code (Wire library) and not enough power. But now we can continue with the app, with a big thank you to Michel.