Nordic Thingy: create an IMU and create a mesh

[huaminhtuan]

Hi,

We are trying to develop a system of IMUs for motion tracking using multiple Thingy boards and an nRF52832 board. The Thingy boards are used as IMU sensor nodes and the nRF52832 board is used as the central controller. All the Thingy boards will be connected to the central controller using BLE. Our questions are:

1/ At the first stage, the IMU algorithm will be tested. We would like to use the Nordic Thingy Android app to show the result because there is an intuitive 3D model. Are there any documents showing how to connect the Nordic board with the Android app? We had a look on the Internet but we cannot figure out.

2/ After testing the IMU, we are going to connect all the Thingy boards to the nRF52832 board. Could we connect multiple slaves (at least 3, could be 8 or more) to one master using BLE?

Thanks for reading and have a good day!

[huaminhtuan]

I found a way to connect to thingy board. Now I am trying to read the orientation data from thingy. I found a table named "motion service" from this website, but I dont know how to use it. Do I need to subscribe to that service?

[haakonsh]

Yes, you need to enable notifications of the wanted characteristics of the motion service.

You'll see from the service description table you've linked to that some of the characteristics sends preprocessed data in a specified C99 type and units. 
Be aware of the Fixed-point representation of floats, f.ex 12Q4.