[Directional Sensor, how do they work please?]

Directional sensors point either to your cursor or to gravity at all times.  If that pointer (the small black circle) is within either of the red sections, the corresponding key is pressed.  This can be used to make self-stabilizing drones, by wiring the drone to turn itself when it's tilted too much.

 

This was EXACTLY the explination I needed!!!! thatnk you so very much, now my deathfish can swim straight

[Directional Sensor, how do they work please?]

As the title suggests, how do i get the directional sensor to work and what does it work with?

 

thanks