DESIGN AND CONSTRUCTION OF AN ELECTRONIC LETTER BOX WITH DISPLAY COUNTER OR BUZZER
ABSTRACT This work is on design and construction of an electronic letter box with counters and indicators.This project is developed for the users to find out whether any letter is inside the letter box and also to display the number of letters inside the letter box. An IR Transmitter and Receiver are connected at the opening of the letter box. In normal operation, the rays transmitted from the transmitter falls on ...
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