The Protocol of Low Energy Multihop to Monitoring The River Based on The Internet of Things

This research is a low-energy multihop network (LoRa) to send river water levels at three blank spot internet locations to IoT Gateways in locations where the internet is available so that river water levels can be monitored via the internet. If there is a rise in river water level or flooding, it can be detected early to avoid the danger of victims and reduce significant losses. The research design is modeled with three sensor nodes and a gateway that receives data from the LoRa network and sends it to the Cloud Thingsboard via WiFi. LoRa will transmit data from the sensor node to the next sensor node in a relay manner up to the IoT Gateway, and the Gateway sends information to the cloud with the WiFi network and cellular network. The message will be sent to Thingsboard via WiFi. To save power, this is done by implementing a multi-hop protocol on the LoRa network where when the river water level is low the interval for sending data to the gateway is slower which is 25 seconds, and when the water level is high the interval for sending data is faster which is 5 seconds. The time interval for sending the water level uses Fuzzy logic with the Sugeno method with the variable input water level and changes in water level. From the test results, it can be obtained that the designed multi-hop LoRa network can monitor river surface levels via the Internet.