Artificial Intelligence (AI) is among most important fields of knowledge and applications in a large variety of domains. Recently however, it has become a trending research topic propelled by Cloud computing, social networks and alike. Terms like machine learning, "Big Data" and artificial neural networks very frequently appear not only in scientific media but even in the mass media. In this project, we aim to design, implement and evaluate an AI technique, namely, deep learning, which has become very popular for face recognition. The problem is formulated from an engineering perspective: to design a small size system based on Raspberry Pi and an attached camera to it to detect and recognise human faces in real time. It should be mentioned that while for humans face recognition is a trivial task, we do it every day and with a full accuracy, for a computer, this is complex task. Recent applications from many industries show a large potential of intelligent systems that need to recognise faces with high accuracy. The thesis is essentially structured into two main parts. In the first part we formulate the problem, analyse potential solutions and propose a solution for its resolution. In the second part of the project we develop the proposed solution into an implementation of an intelligent system for a computationally limited and physical portable device (Raspberry Pi). The solution is empirically evaluated in terms of accuracy and performance using real data sets. The relevance of using such a small size intelligent system relies in the fact that this application can be installed in other devices, such as drones, easily, at low cost and without compromising the performance and speed of the said intelligent system.