@dusjagr @Pannu
The Arduino code for the respiration chamber is available over here
The Android app is found over here
First time you connect via Bluetooth you need to pair the HC-05 with your phone first. You need to do that in the Android system settings, the pairing code is 1234.
I created a Survey with a sample ID and location question over here:
https://app.our-sci.net/#/survey/by-form-id/build_Randen-Soil-Chamber-Measurement-with-the-Soil-Chamber-built-at-Randelab_1525625829
It will show up in the Android app as “Randen Soil Chamber”.
Let me know how it goes and keep up the good work!