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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