Ask HN: I need ideas to impress fifth graders with technology
Adafruit Circuit Playground.https://learn.adafruit.com/introducing-circuit-playground/ov...This thing is quite amazing, very pretty visually, self-contained, and can interact with Bluetooth modules.If you have the skill to program it, it will be impressive and bright LEDs will show well.Make a LED level, for example, using the accelerometer. A sound meter using the microphone, thermometer using the temp sensor, light meter with the photo sensor etc.As for the finishing touch, I would show that I have been using my free phone as a full desktop computer to both conduct this presentation and control the device. That should blow everyone's mind when they realize they have unrestricted computers disguised as phones in their pockets. :)