Motion-sensing graveyard
A PIR sensor spots trick-or-treaters and a servo pops a ghost up to greet them.
2–3 evenings
Building this October
Full pipeline →The Halloween lane: spooky builds we're making this month. Picks land soon — each card shows the real parts, effort, and kid roles.
Ghost-writing wand
A persistence-of-vision LED strip that writes glowing words in the dark — captured with long-exposure photos.
2 evenings (needs darkness)
Fog cannon
Cooler + dry ice + fan lays low fog across the yard; a laser pointer becomes a "ghost detector".
1 evening + Halloween night
Haunted cardboard automaton
Cardboard cams, a follower, and a crank — turn the handle and a spider rises and waves. Zero code.
1–2 evenings
Never-rotting pumpkin
A foam pumpkin with a flickering LED circuit that outlasts every real jack-o’-lantern on the block.
1 evening
Haunted paper-circuit house
A paper house where the windows are the switches — press one and a room lights up.
1 evening