I would like to have a robot who acts like an alarm, it would control rooms, front and backdoor by walking around the house. If it noticed movement it would message the owner and start filming the envirement (to get the source of movement on camera). The cost saved for placing an alarm system could be invested in a robot, who can be put to use for other stuff when the owner is home. In addition it could act as a smoke detector to look for fire.
By hammertje
Other robots from Synthiam community

Lumpy's Lumpy's - R2-D2 Build Two-Two's
Hello Again, Ive been asked to post some pics of my R2 build. Ill toss them up. This has been approx. a 3 year project...

Luis's Lcd Display For Ezb4 - Using Arduino Mini As...
Hello again, I have created an LCD Display for the EZB4. This is a very cheep and easy project. You will need 1 LCD...

Ezang's Mr. Big Bot For You See Laugh And Enjoy
7/16/2019 My New Robot for you see laugh and enjoy