This Project “Door Bell with Security Feature” works such that when someone presses your calling bell switch during the night, not only the bell rings but the bulb connected to it also glows. During day time the when anyone presses the calling switch the bell rings and the light does not glow. The Light will glow during night only. All the above systems are controlled by the Popular 8 bit Intel Microprocessor 8085A. It monitors the bell switch until it pressed, and if it is pressed it will check whether it is day or night and if it is day then the Bell is only switched on and if it is night the Light is also switched on with the bell until the reset switch is pressed. The monitoring for Microprocessor is done by the PPI (Programmable Peripheral Interface) IC8255.
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