Digital display control using automation

Abstract

Display system finds vast application in most of the fields. The digital display discussed in this paper uses Raspberry pi, Led dot matrix, shift registers (74HC595) has their main components. The digital display system uses IOT platform (i.e. IBM WATSON) as a communication interface between raspberry pi and the led dot matrix. The user types the message that needs to be displayed into the display (led dot matrix) using web application/android application which can be accessed by the user, only if the authentication process is completed. Then this message becomes input to the raspberry pi (controller) which acts as a gateway in this IOT based application. Generally all micro-controller development boards have 20–30 General Purpose Input Output (GPIO) pins which are insufficient, because it cannot be interfaced with the larger displays. So to solve this problem, the Serial In Parallel Out (SIPO) technique is used. The shift register IC uses this technique and takes one serial input of 8 bits and converts it into 8 different outputs of one bit, which can be connected to the led dot matrix. So the overall system built is user friendly, cost effective and consumes low power as it uses LED display. This digital display is a perfect replacement for posters and trivial noticeboards.