I came across this little gem while I was patent-diving for a steam-engine valve. It’s an old-timey “portable burglar alarm” with a novel alarm system. It’s quite simple, but could be surprisingly effective at preventing illegal entry (or inducing sudden heart attack).
The alarm unit is hung from a peg above a door, through which the burglar would presumably enter. When the door is opened, it pushes the unit off the peg, and said unit plummets to the floor. When it hits the floor, the plunger “D” is pushed up into the housing, and firing pin “d” (lowercase) impinges on cartridge “c”, which fires, thus sounding an alarm.
It also makes provision in tube “e’ ” for storage of extra cartridges, a removable cartridge holder “B”, and a window through which the cartridge might be changed “a”.
The perfect way to prevent handlebar-moustachioed rapscallions from making illicit entry to your estates.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.