In this final project it is done a simple prototype, not complex in order not to overload the packet network or the computational part, of a sensor network, which communicating through wireless body area network (WBAN) are able to characterize daily activities. The nodes used were the Adafruit HUZZAH32 from the company Adafruit, it’s a System on Chip, which incorporates a Wi-Fi module that has been used for the communication between devices.
Firstly, an analysis has been done of the available system. On the one hand, an analysis of the devices and on the other hand a study of one possible characterization from data already collected.
In a second phase, the software of the devices has been modified to create the sensor network and to communicate with each other. For this purpose, the Wi-Fi module of the devices was used, after which, once they were connected, a series of experiments were carried out for different scenarios. With these experiments it has been possible to set thresholds for the development of the final classification algorithm.
Finally, in a third phase, the different tests have been exposed according to the algorithm performed in the second phase.
The results obtained have shown that it is a valid algorithm for the characterization of activities. In addition, an accelerometer has been included to differentiate more activities.
The work has been carried out within the R&D area of ACE Business Group. The project has been started from scratch, being the only development engineer involved.
In hospitals and nursing homes there is a need to use a healthcare system that allows an effective communication between the patient and the nurses, in addition to monitoring possible events that allow immediate actions.
The project proposes the design of a complete solution that allows integrating a low-cost peripherals network in a modular and user-configurable way. The design focuses on a centralized architecture with a gateway capable of automating the behavior of sensors and actuators in its environment, with a wired or wireless connection. In addition to automation, the user receives notifications of each of the events, allowing real-time monitoring of the rooms.
During the project, two electronic systems, a central node, and an assistance push-button mechanism have been designed, with the aim of integrating a generic assistance call system and a scalable communications protocol to a future more complex sensors and actuators network. The development deals with both the hardware and the software necessary for its implementation, as well as a set of tests to validate its operation for future commercialization.
The gateway acts as a hub for nodes within the rooms, with BLE, Wifi, Ethernet, RS485 interfaces and GPIO ports. The design is done in a modular and scalable way over FreeRTOS Operating System.
The push button is designed with 3 different configurations on the same PCB: wired, wireless, or by direct digital I/O. It is oriented to an ultra low consumption design with the ability to last for several years over BLE.