Merg Kit PMK18 the one if your a member
This servo module controls your points and is set up using only a small screwdriver. It is
suitable for use on DC, DCC, and CBUS systems and does not require a computer to set it
up. The completed module can control a single servo (not included in the kit), requiring
only connections to a 12V DC supply, the addition of a servo and a simple on/off switch to
operate the point. The builder must make his/her own connection arrangements between
servo and point/signal to be operated.
they work very well £6.28 plus postage although a Ardunio would do everything you want
Nick B
https://www.rmweb.co.uk/blogs/entry/16177-homework/
offers a Ardunio solution which could be modified boards via that site are very cheap but does require a little work on your part