i want precautions of logic gates project for class 12
i request you to give me some material regarding my requirement.

On a basic electric circuit making a door and using only switches, a power supply of the lamp and the power, it just switches in series with a lamp. All switches must be on the lamp to go.

IEC door or
Well we all could have a list of integrated circuits (IC) with and functions of door in them, we love using, but a few times, you can not beat old technologies and the use of components that were used before IC were invented. with a couple of LEDs signal (such as 1N1416) and a pull up resistor, you can not only save on the component cost, but can save space on your printed circuit board (PCB).
When the Anode of a diode at the high level, down to the Anode of the other diode will keep the low output until two Anodes go high.