I have considered the radar distance detector
But it have some disadvantage: It need to be installed in the axis of a
straight track and have no obstacle.
If the track is the main one of the station, and at the in and out of
the station you also have straight track, you can't install the radar.
And if you do train maneuver and place a wagon between your train and
the radar, it can no longer measure train position.
Now, I am thinking of using 2?light sensors (with IR) to detect train
arriving, measure its speed and signature (amount of IR reflected).
From it's speed and signature, calculate it's length and coupling
position.
And from speed, time and length, calculate its position.
But if JMRI already do the calculation part, it wont be original enough.
And I maybe need to found another idea.
"Ken Heywood via groups.io" <kheywood@...> writes:
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My first step would be to profile locomotive speed with the JMRI profiler (bottom of the "roster" menu).
That correlates speed step with actual locomotive speed over the entire configured decoder speed range.
So, if you know the throttle speed step as you enter a detected section of track and the length of the section, you can calculate position (d=v/t).
Assuming, of course, that the speed step doesn't change.
Otherwise, you need more sophisticated technology like those radar distance detectors used in robots.
