Introduction There are more than 500 million units with Android operating system. Every day 1,3 million new android devices are activated [1]. IHS iSuppli technology consulting [2] has recently published a report that foresees a steady increase in the trend of the Android system’s sales in next years. In 2013, according to the IHS iSuppli study, 52 per cent of the tablet devices and approximately 60 per cent of the Smartphones would use Android OS. This trend keeps increasing steady, thus by the end of 2013 there would be about 1 billion devices using Google’s operating system for mobile phones. According to IHS iSuppli estimations, global sales of Android devices may reach a peak of 3,000 million by the end of 2016. Commercialization of smart devices with Android OS is vast and the market is still young. Smart devices (such as Smartphones or tablets) have become an important part of our society thanks to the great variety of services they offer through their apps. Because of them users can look at the weather forecast, consult an address, or even buy a flight ticket with their smartphones. Hence, why do not use this technology to control an automatic door with a Smartphone or a tablet? The idea of the project was born out from this concept. The objective is to create a system for Smartphones and tablets that is able to open and close automatic doors wirelessly. A system consisting in an Android app connected to a smart device through Bluetooth communication, has been designed with this aim. The project consists in the design and development of both the OpenDoor app in Android OS and the physical smart device named OpenDoor. The purpose of the system is to remotely control any automatic door with a Smart device like the remote controls used to do. Nevertheless, OpenDoor does not seek to replace traditional controls, but to complement their functions. Thus it would be possible to use both devices. Furthermore, OpenDoor system increases the distance of action up to 100 meters thanks to the Bluetooth module class I that uses. As there might be the commercial a business plan is presented in the thesis, an initial approach for a start-up project to commercialize the OpenDoor system. Currently on the market there some options to open automatic doors via Wi-Fi, Bluetooth, and also through phone calls or text messages. However, the systems used have a high price and they are poorly popular. The fact that they are directly connected to the mechanism of the automatic door make that an installer technician is required to set up the system so that these proposals are not so practical. Furthermore, those systems that require a call or text message are insecure and need mobile coverage to use them. This project presents a simple and practical way of opening and closing automatic doors. Unlike the actual systems on the market, OpenDoor not require a specialized technician for its installation, because of this it offers a much cheaper a price than all the existing options. OpenDoor improves the options of automatic doors management. The system does not limits its use to one Smartphone or a single user, so any desired person can operate the system with his Smartphone, which is a more practical than a traditional remote. Sharing access has never been so easy. The system could be particularly useful for rent-a-cars, business that have automatic doors, private houses or houses for rent. Security has been a central issue in the development of this project from the beginning. In case of theft or loss of the Smartphone or Tablet of the user, OpenDoor has two systems that guarantee the user’s safety. Some security codes that can be changed by the user increase the high security of the Bluetooth communication protocol. Methodology A number of objectives were set to build the OpenDoor system. The project development was established as follows: - Development of OpenDoor app in Android OS with a simple but intuitive interface. - Creation of the OpenDoor Smart device consisting in a class I Bluetooth receiver, a microprocessor and additional electronic components. - Establishment of the Bluetooth wireless connection between the Smart device and Android App. - And finally, the operation of the door remote control in the OpenDoor device by the user with OpenDoor Android application. Additionally, upon completion of the initial objectives, another set of goals have been achieved: - Improvement of user interface and functionality of the Android OpenDoor app. - Distribution of OpenDoor in Google Play Store. - Setup of Smart device OpenDoor with AT commands. - Security upgrade: Development of a system to change Bluetooth PIN and action PIN. - Entrepreneurship project: OpenDoor system Start-up. The design of the OpenDoor system began with the choice of the communication protocols of both the Smartphone with the Smart device, and of the Smart device with the automatic door. Regarding the first communication protocol, the choice was Bluetooth technology because of its high security and also because of its widespread use and optimistic future projection of use, so it will not get out-dated in the near future. On the other hand, for the communication between the OpenDoor device and the automatic door, the decision was not to communicate physically the device and the door, but wirelessly through a traditional remote control connected in the OpenDoor Smart device. This decision is critical for the project because of its innovative aspects. With this configuration OpenDoor can be used in conjunction with remote controls, and also has the advantage of being able to get installed without the need of an installer technician. After having made the decision of the communication protocols, the design was arranged. First, the procedure was to create the application OpenDoor in Android OS, capable of sending commands via Bluetooth. Afterwards the OpenDoor smart device was developed. Its function is to receive commands from the Android App and to induce the action of the remote control. Once the smart device and the OpenDoor app were developed and tested, all the goals were achieved. Additionally the interface design of the app was improved and a security upgrade was made to the system, giving the user the opportunity of changing the security Bluetooth PIN code and the security action code. Finally, a business plan for a start-up that commercializes the OpenDoor system was proposed. Results The results of the thesis have been entirely satisfactory. Several tests have been conducted with different door remotes and the OpenDoor system has responded efficiently in all the tests. Regarding the range of Bluetooth in the OpenDoor system, it has not reached the theoretical maximum of 100 meters (it has actually reached an actual range of about 80 meters), nevertheless, it has proven that it reaches a much larger distance than the traditional controller. Furthermore, as the control is connected to the OpenDoor smart device, it receives the proper and constant voltage by an electrical source, and not through a battery, which provokes the gate to respond much more quickly and accurately than with a battery as voltage decreases with use in batteries. Conclusions In conclusion, the OpenDoor project is an innovative and economic system which offers the possibility to operate automatic doors via a Smartphone or Tablet, replacing the traditional remote control. In addition, customers can safely share the codes with other users to permit their access. OpenDoor brings the change needed by automatic doors, providing them with an intelligent system to manage opening and closing in a secure way, and also offering new possibilities for users that look for a more comfortable and safer way to enter their homes, businesses or garages.