For the Hubble Telescope that I displayed at the WRO in November, I created and used a particular NXT-based remote control. Its two levers allow for control of a remote NXT model in three dimensions, with three touch sensors for triggering additional functions (controlling the solar panels and the lid case of the telescope). A color sensor might be used to display the connection state of the remote control.
Have a look at the associated web site; you will find also the LEGO Digital Designer file there in case you are interested to build and use it.
Have a look at the associated web site; you will find also the LEGO Digital Designer file there in case you are interested to build and use it.