An Approach to Raspberry Pi Synchronization in a Multimedia Projection System for Applications in Presentation of Historical and Cultural Heritage
An Approach to Raspberry Pi Synchronization in a Multimedia Projection System for Applications in Presentation of Historical and Cultural Heritage

Summary/Abstract: This paper discusses an implementation of a multimedia projection system with two synchronized video sources, based on the Raspberry Pi single-board computer systems. The system is primarily intended for various projections in presentation of historical and cultural heritage, although it can be used for many other related purposes. The considered multimedia system has two projection surfaces - a horizontal projection plane and a 45° inclined special glass projection plane which creates the hologram-like Pepper’s Ghost effect. Each plane displays a separate high-definition video obtained from the corresponding Raspberry Pi. Synchronization of presentations is achieved using custom connection through the general purpose input/output (GPIO) connector of the Raspberry Pi and the wiringPi interface library. As valuable aspects of the system, we can point out the following. From the practical point of view, the system has low cost due to the use of Raspberry Pis. Generation of a holographic effect, as well as larger flexibility in creating the contents of the presentations due to the two projection surfaces, are additional attractive features.

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