I'd like to investigate creating a safety feature for Type 1 Diabetics driving a car. Allowing HealthKit glucose data (read from a Dexcom G7 or similar) to be displayed as part of the CarPlay UI background or show an icon/button with the number visible. I'd also like to include a warning system for glucose low's that alerts the driver audibly. Has anyone looked into that before?
Using HealthKit to display data on CarPlay UI
I think you'll struggle here. As I understand it the iPhone is generally locked when in use with CarPlay.
If the iPhone is locked, access to the Health Store database is unavailable. This would mean you couldn't access those blood glucose values.