[Ronja] Not only Ronja suffers from sun on the axis

[Karel Kulhavy]

Today I went with a bus and on one bus stop one door wouldn't close, it was
ringing all the time as if someone stood in the door. So the driver came,
turned the emergency open cock and closed the door manually. Then he explained
that the optical sensor in the door was confused by a beam of sunlight. On the
next stop the door functioned normally.

I guess the problem was that the sun accidentally was in a position where
direct sunlight could fall on the detector which is hidden somewhere in a gap
and saturated it so it couldn't receive the AC optical signal from the
transmitter on the other side of the door.

This happens with Ronja time to time if the sun get very close to the optical
axis. It's something like Stonehenge, it indicates the time of year.

CL<