QoS analysis of WSN (Wireless Sensor Network) using node MCU and accelerometer sensors on bridge monitoring systems

Based on the planning guideline of Health Monitoring System of Bridge Structure of Kementrian Pekerjaan Umum dan Perumahan Rakyat, one of the main components needed in bridge health monitoring system is a communication system. The application of the WSN (Wireless Sensor Network) function to perform monitoring can be used to create a more practical system. Based on the system, required hardware that can be integrated with the software and can connect on wireless. Proposed methods using WSN (Wireless Sensor Network) on devices, then do testing on connectivity to obtain network quality and data sensor. Data sensor will be uploaded on the cloud can be accessed from various places that connected to the Internet network thus forming an IoT (Internet of Things) based system with using Message Queue Telemetry Transport (MQTT) protocol. Experiments carried out in two ways of connectivity, point-to-point and star topology to determine the network quality of each device, which is Node MCU and Mi-Fi modems. Network quality parameters can be known by looking at the value of packet loss, delay, jitter, and throughput. In the results, the MQTT Protocol applied to build IoT system. In addition, proposed methods that used in this research has a great quality network with packet loss <25 ms. However, there’s a big gap between serial data and online data that makes MQTT protocol is not suitable for monitoring systems that require fast data transfer.