It's a movie about a boy who is the typical little genius. I watched it in Italy in the early 80s.
The things I remember about the protagonist:
- his chamber was full of electrical devices
- he wore glasses and seemed to be about 12-13 years old and was a bit socially awkward
- at one point, he accepts to play soccer with some kids; after realizing he wasn't good at the game, he invented a kind of force field, so that the ball bounced against it without scoring a goal (he was playing as goalkeeper, and stayed motionless all the time keeping his hands in front of himself)
- the main plotline is about this boy using his inventions to defeat a group of burglars who wanted to steal something that was in his house.
The movie was targeted at younger audiences and didn't look like a big budget movie. It also seemed European rather than American.