You can get a signal to JMRI by replacing the indication LED with the input side of an optoisolator, connecting the other side to whatever electronics you use to get inputs. The 6N137 is a convenient part for this, as it produces a logic output (that¡¯ll work with lots of systems) when the juicer would light the LED.
Bob
On Jul 25, 2017, at 5:29 PM, dave@... [jmriusers] <jmriusers@...> wrote:
A cool change to the circuit would be an output to JMRI so that a locomotive running onto a frog the 'wrong way' could be detected and used to trigger the point to change. This would be really useful in a DCC fiddle yard where you could drive any train out of the yard and have the points set for it without needing additional sensors!
--
Bob Jacobsen
rgj1927@...
Bob Jacobsen