fix: investigate why the illumination sensor is not working properly

[paulinek13]

The illumination sensor readings are inconsistent (usually 0 in bright sunlight, but occasionally small non-zero values indoors).
Maybe it's broken. Maybe we need a new one. Anyway, root cause needs investigation.

[niziek58]

I don't know why it's not working 🙃

[paulinek13]

@niziek58 We fixed this about 2–3 months ago. So let's explain what the problem was, and then we can close the issue after pushing the latest changes (from that time) to main.