Telemonitoring systems, including Wireless Body Area Networks (WBAN), are an important support for the monitoring of patients with chronic diseases. This article shows the development and evaluation process of VISIGNET, a prototype open hardware interoperable vital signs monitoring system that captures data of clinical variables from a patient and sends them to a cloud-based service for their remote visualization. The article first presents a synthesis of the system design, which consists of a WBAN that captures data from three sensors, namely heart rate, body temperature, and blood pressure. Then, it explains the WBAN operation and the data transmission process to Xively, a cloud service. Finally, this article shows the findings of the evaluation of the system, analyzing parameters like coverage, the Frame Error Rate (FER), end-to-end delay, and the battery life of the sensors. It also shows the implementation of a case study with 100 patients from two health centers.
