Door-Ajar Alert with Countdown Timer

Ever accidentally left your room door ajar for a long period of time and found your valuables missing? Here is an intelligent solution for you. The idea is fairly simple as it mainly requires a TM1637 4-digit display and a Digispark USB development board. Digispark board TM1637 is a popular clock display module with a TM1637 driver chip from Titan Micro Electronics. This 4-digit, 7-segment LED display modul ...

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Bag movement alarm for theft prevention

In short: I developed a portable, battery powered device that sounds an alarm when your bag or purse is moved. Once armed, can only be turned off by your secret code. The device is built off an Arduino compatible Trinket Pro, using an off-the-shelf project box with PCB. ---------------------------------------------------------------------- Problem I had: When I go to a happy-hour or a cocktail party, I ofte ...

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