Spent the holiday weekend chilling with friends, and we built a few Jitterbugs (tiny, super-simple, super-cheap robots that run away from light, cockroach-style). I’d totally forgotten how much fun these are. Here’s a video of my 4-year-old sitting in the closet with flashlights and competing at “reverse sumo” (first person out of the ring wins):
Here’s a set of Jitterbugs built by Stephen Trouvere and his boys, with the addition of LED eyes:
I love how those lil guys turned out! For the curious, all we’ve done is built the standard jitterbug, then taken a pair of regular ol’ red LEDs, wired them in parallel, buffered the positive lead with a 100Ω resistor (brown-black-brown stripes), and soldered the free resistor lead to the positive battery terminal, and the negative LED legs to the negative terminal (it’s the same way we wire up the LEDs in the “Switchbox” project in that same book).