Research has been carried out on uncertainty studies in current and voltage measurements based on the Internet of Things using the NodeMCU ESP8266 microcontroller. This research aims to design a current and voltage or power meter using a current sensor in the form of an INA219 module and a voltage sensor with a microcontroller-based voltage divider circuit module and determine the validity of the measuring results of the instrument created. The method used in this research consists of three stages: hardware design, software design and system testing.
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