Development of an IoT-Based Prepaid KWh Meter Monitoring System with Web Monitoring and Electricity Token Balance Notifications (Case Study: PUPR Sumatera VIII Apartment Complex)

Bika Abdul Sandi (Islamic Sultan Agung University)
Jenny Putri Hapsari (Islamic Sultan Agung University)

Journal of Computer Science, Information Technology and Telecommunication Engineering (JCoSITTE)
Vol 7, No 2 (2026)

Rusun PUPR Sumatera VIII faces three problems with its prepaid electricity system: the kWh meter alarm is inaudible from inside the units because the meters are centrally located and enclosed, there is no record of electricity consumption available to residents, and there is a risk of damage to electronic equipment due to sudden power outages. The research method was carried out by measuring the output of the prepaid kWh meter using a PZEM-004T sensor, which is then read by an ESP32 microcontroller and transmitted to a website server. The remaining token is calculated as the difference between the input token value and the energy consumed, and the system automatically sends a notification to residents via WhatsApp when the remaining token falls below 5 kWh. The test results of the PZEM-004T sensor show an average precision of 98.88 %, an accuracy of 98.12 %, and an error of 1.88 %. Based on these results, the system is feasible to be implemented in the apartment building.