Depending on which particular symptom or symptoms of Parkinson's you intend to measure will effect which IMUs and how many you will need.
I have a working prototype with similar goals for working with Essential Tremors. I started with an Uno but quickly exhausted it RAM capacity with one IMU and a fast data logger. Now using a Mega but intend to switch most likely to a Teensy 4.1 I would advice you to consider separating the analysis s/w from the data collecting s/w.
Some other problems you will need to solve:
- How to power your project. Tethered or free movement
- How to position your sensors so your measurements are repeatable with some fidelity
- Adjunct to 2. Quick and easy to put on and take off
- Adjunct to 2. The sensors rig must not interfere with natural movements
AMA