Build your own safe hidden in plain sight to store valuables -- and rig an intrusion detector with Circuit Playground Express!
Ring in the New Year with a fun countdown clock that plays Auld Lang Syne! Doubles as a light-up party favor and noisemaker!
Use a Circuit Playground Express and stuff in your kitchen to build your own sound-activated snow globe.
Build a working safe that uses the Circuit Playground Express as the dial to unlock a servo controlled safe!