The above designed circuit represents an automated home security system. This is the first part; sensor circuit has been described in the latter post below. This circuit uses the Atmel IC 8052 i.e. AT89C52 an 8-bit microcomputer IC.AT89C52 is a low power, high performance CMOS 8-bit microcontroller with 8K bytes of Flash Programmable and erasable read only memory (PEROM) i.e. In-System reprogrammable (ISP) flash memory and a three level program memory lock. AT89C52 is also equipped within by a 256X8-bit internal RAM and three 16-bit counters.
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