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555 timer with two outputs?
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geobee:
Hi all, trying to perform a function on a model rail layout. I need to have a setup where a single trigger input, be it a simple momentary button switch, or a signal from an infrared sensor, or even a reed switch, it doesn't matter, but I require two outputs that switch from one to the other when the input is triggered. The outputs can be latching on, or just a momentary signal to drive a relay. Probably a momentary would be best. I am trying to set up a system where a train is sent down one direction, then reverse and be sent down the other track after it reverses back over the sensor trigger. I have the automatic reversing all worked out, jut the A/B output to switch the direction points of the track.I thought maybe something around a 555, or similar  might do the job. Any help would be much appreciated.
larsdenmark:
I'm not sure that I fully understand what you are aiming at, but it sounds as if you can use a shift register:
https://en.wikipedia.org/wiki/Shift_register#Serial-in_parallel-out_(SIPO)
You would then only use the first two outputs.

Shift registers are cheap and can be used for many things so it doesn't hurt to have some of these lying around.

Alternatively you could use a (very) small microcontroller.
Zero999:
The 555 timer only has one output. Another 555 timer could be added, to invert the output, but there are other monostable IC which provide both inverting and non-inverting outputs. Try the CD4538 or 74HC221.

http://www.mouser.com/ds/2/149/cd4538bc-294672.pdf
https://www.ti.com/lit/ds/symlink/cd54hc221.pdf
geobee:
Thanks for the help. Think I have found a very cheap solution on the old Ebay. A little flip flop relay module that changes state when it is triggered. It cycles through contacts open/closed whenever a trigger signal is sent to it. Perfect solution, neat and dirt cheap. A little more than $1AUD each.
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