The above designed circuit represents an automatic room light controller. Here Infrared (IR) sensors has been used to sense and provide an input to trigger the 555 timer. This circuit uses the Atmel IC 8052 i.e. AT89S52 an 8-bit microcontroller IC.AT89S52 is a low voltage, high performance CMOS 8-bit microcontroller with 8K bytes of In-System programmable (ISP) flash memory and a three level program memory lock. It has operating range from 4.0V to 5.5V. AT89S52 is also equipped within by a 256X8-bit internal RAM and three 16-bit counters. Also, general purpose switching and amplification transistors BC547 and medium power transistors suitable for a wide range of medium voltage and current amplifier applications have been used in the circuit.
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