Abstract :
Climate and weather changes cause changes in the seasons to be uncertain,
such as the dynamism of the transition, so the surrounding natural conditions
cannot be determined anymore with only visible visions. The development of
technology that is increasingly advanced makes the concept of IoT (Internet of
Thing) not just a mere dream. The IoT concept allows us to connect a device with
other devices through internet connectivity to exchange data and so on.
Water level monitoring systems and water flow velocities require an
ultrasonic sensor and water flow sensor. Control of the monitoring system is
controlled through the web that is operated by NodeMCU as a microcontroller and
in its connectivity is assisted by wifi. This system is designed to determine the level
of water and the speed of the flow of water in the Code river in realtime which is
expected to help in providing information to the public and related agencies
regarding water level data and the speed of water flow.
From the results of the study of water level monitoring system using
ultrasonic sensors as a water level detector that is only able to detect a maximum
water level of 20 cm with an average error of 0.007%. The error value is a
comparison between the ultrasonic sensor and the manual height. And the water
flow sensor as a detector of water flow velocity is only able to detect a maximum
water flow rate of 36 liters / minute in the river code with an average error of
1.51%. Error value is a comparison between the water flow sensor by calculating
the speed of a banana tree trunk that flows through a stream using a manual meter.