<![CDATA[This study aims to design and implement a household electrical current and voltage monitoring system based on the ESP32 microcontroller. The system integrates an ACS712 current sensor and a ZMPT101B voltage sensor to acquire electrical parameters, while the ESP32 processes the sensor data and displays the results through an LCD and an Internet of Things (IoT) platform, ThingSpeak, for remote monitoring. An experimental quantitative approach was used. The system was tested by comparing sensor measurements with a Sanwa CD800a digital multimeter under household electrical load conditions. Measurement error was calculated from the absolute difference between sensor and multimeter readings relative to the multimeter value. The voltage test consisted of ten measurements and produced an average error of 3.82%, with the highest error of 13.64% and the lowest of 0.90%. The current test consisted of fifteen measurements using 100 W, 133 W, and 300 W loads and produced an average error of 6.30%, with the highest error of 11.11% and the lowest of 2.21%. Calculated power ranged from 85.72 W to 285.02 W and increased consistently with the applied load. The integrated system successfully displayed local measurements and transmitted data through IoT, with a response time of approximately 1–3 seconds. These findings indicate that the developed prototype can provide real-time household electrical monitoring with practical measurement performance, while further sensor calibration is recommended to improve accuracy.]]>
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