Lego (not this flash modern stuff, mind) taught me that it’s the construction, not the result, that is the fun. So I don’t have a single device I’m planning on building, I have several!
Turtles are cool, but their 50-year lifespan is more than I can commit to. So I’m gonna make a couple of robot turtles. Or maybe a robot turtle and a robot clownfish.
I’d also like to make a couple of little daleks which are light-averse but hunt a bluetooth source. Visitors with BT-enabled devices would then be stalked by these little guys. On their off-hours they could switch to RFID and patrol our designated no-dog lounge for illicit canine presence.
When I was a tiny we had these wooden marble toys, you’d drop a marble in and it would roll here and there down some rails. With an Arduino these could be a whole bunch more interactive. I really like the idea of combining future tech with oldschool wooden construction. My grandpa had to build wood in mostly straight lines; Ponoko can cut me nice spirals …
Likewise I’m really tempted to hijack and “enhance” one of my sons wooden trucks or trains with das blinkenlights unt das remotekontrollen. He’s quite into trains at the moment (2yo) so bringing one of those devices to life would be quite fun.
Finally, at the end of a long hack session, what could be better than slipping on an EOG sleep sensor device built into a pair of airline sleep goggles? (Not the ones the pilots used on NW188, mind.) This way, by detecting patterns of ocular muscle activity and blinking LEDs in set patterns (GREEN GREEN RED RED), I can kickstart my mind in REM state and remind myself to plan more hacking madness for the coming day.
Fantasy shopping list so far: flipper actuators, mini ballast pumps, waterproofing outer fabric, lasers for the daleks, lots of whirring bits for the marble kit, wheels and motors, super-sensitive sensors to pick up my eyeballs spinning in my sleep, and blinky lights galore. Plus the hardware glue to bring it all together.