Bluetooth Low Energy Communication For Multi Sensor Applications Design And Analysis

Bluetooth Low Energy (BLE) has emerged as one of the main wireless technologies used in low-power electronics, such as wearables, beacons, and devices for the Internet of Things (IoT). BLE's energy efficiency characteristics and ease of use interface are essential features for the design of ultralow-power devices. The integration of BLE with various sensors is certainly the main aspect for the development of efficient solutions, and monitoring the power consumption of the device in all the cycles of operation is important for decisions such as advertising interval, sensor routine and data transmission. Recent work of BLE power analysis focuses on the theoretical aspects of the advertising and scanning cycles, with most results being presented in the forms of mathematical models and computer software simulations. Such models and simulations are particularly important for the understanding of the technology. However, many times they leave real applications out of scope. This thesis covers the implementation of a multi-sensor Bluetooth Low Energy system, and the study of the communication protocol regarding its power consumption and RF performance. The implementation consists of a battery powered custom Printed Circuit Board (PCB) featuring the Texas Instruments CC1352P7 as the main SoC and three different sensors capable of measuring 6 different parameters. The sensors are the BME688 from Bosch, and the ADXL343 and AD5941 from Analog Devices. The characterization process was performed using Keysight EXR Oscilloscope and 208A Spectrum Analyzer. The proposed design has dimensions of 28 mm × 35 mm. The current consumption of the implemented design with one sensor in operation is 4.1mA and 7.1mA, and 6.9 mA combined.