Make a Talking Security Alarm with a PIC16 and ISD1820

Alarm circuits are common in the field of hobby electronics, typically utilizing a switch (such as a reed switch) and a speaker to produce an alarm. However, the alarm system in this project has several unusual features that will be able to fool most intruders.

In this DIY Hacking project, we will make a security system that will fool intruders into thinking that someone is around!”

Link