Learn / Circuits / Boost / Tilt-triggered alarm
BOOST
INTERMEDIATE
Ages 8+
6:30
Tilt-triggered alarm
A buzzer that sounds when something moves. The tilt block closes the circuit when it tips — your first sensor, and a genuinely useful build.
VIDEO · exercise walkthrough · chapters: parts · build · test · why
Blocks you need
Battery · Buzzer · Tilt sensor · 3 wires
You'll understand
What a sensor isInput vs outputTrigger conditionsReal-world circuits
Steps
1Connect battery, buzzer and wires into a loop — but leave one gap.
2Snap the tilt block into the gap, flat side down.
3Tip the whole build. The tilt closes the loop — the alarm sounds.
4Mount it on a door or a lid. Congratulations: you've built a burglar alarm.