This burglar alarm is designed using 555 timer. This circuit is mainly used in homes and offices for security purpose. This circuit is designed to alert the user when an intruder enters into the home.

Ferrithemaker has published a new Raspberry Pi project to the Hackster.io website this week, providing details on how you can create your very own DIY Raspberry Pi intruder alarm and detection system.

The circuit was designed to provide an alarm system against any form of burglary based on the operation of CMOS 4011 where a high output would only result when any of the input is low. The circuit was ...