Hi Alistair, yep it does have a rain sensor. Ill sort out some pics and post them for you. Is there anything in particular you would like to see???....its really a simple design, using heavy duty "V" pulleys on an angle iron rails for the roof then a cantilever and balanced shutter. The roof is operated by a garage door opener which is wired into a universal Velleman board and is run by lesvedome software which is Ascom compatible ...see link
http://www.dppobservatory.net/DomeAu...DomeDriver.php
all automated with CCD Autopilot....it will park the scope before closing the roof, but I will be fitting a safety switch that cuts power to the roof when the scope is pointing up.