Dedicated AI add-on called the Raspberry Pi AI HAT+. It works with the Raspberry Pi 5 and comes with built-in AI accelerators, so you can run things like computer vision or robotics tasks right on your Pi.
But, Have you actually done it? It's difficult to get an idea how simple it is to get going.
I see it's possible on the Arduino Nicla Vision too.
I'll start with something more basic, because it's the 10 year old, not the12 year old, lad.
The Arduino R4 looks good for that. It has some sensors and a little led matrix display, which he can start with.
The board is about £25, but they're keen to flog you a kit for £88-100

Does anyone here speak Arduino?
I've done a little with them. Enough to discover eg that the little voltage regulator board you can get to plug into a breadboard, is very poor.
It doesn't dissipate enough heat to drive anything much. A quarter amp and a few excess volts is ~ a Watt - so the components fry very easily.
Anyone know some power supply which is neat and more robust?