PREPAID ELECTRICITY BILL PAYMENT METHOD VIA BANK TRANSFER USING QR CODE THROUGH SEPAY PAYMENT GATEWAY INTEGRATED WITH ESP32 DEVICE

Abstract

The collection of electricity fees in dormitories, rental houses, and mini-apartments often faces inconveniences such as manual collection, high error rates, revenue loss, and lack of transparency. This study proposes a prepaid electricity payment method via bank transfer using QR codes through the SePay payment gateway, integrated with an ESP32 device to automatically deduct electricity costs based on the residential electricity tariff issued by Vietnam Electricity (EVN) and disconnect power when the prepaid balance is exhausted. The research methodology is based on an analysis of existing studies on IoT-based smart energy metering systems using ESP32 and prepaid meter applications. The results show that landlords generate dynamic VietQR codes for each rental room, allowing tenants to scan the QR code using e-wallets or banking applications to transfer money directly to the landlord’s bank account. The bank pushes transaction data to SePay for automatic verification, which is then stored via webhook/API and integrated with the ESP32 device to update account balances, automatically deduct electricity fees according to EVN’s tiered tariff structure, and actuate a contactor to disconnect power when the balance becomes negative. The entire process is completed in less than 10 seconds, ensuring high security and transparency. In conclusion, the proposed method is particularly suitable for dormitories, rental houses,
and mini-apartments, significantly reducing manual workload, promoting cashless payments, and enabling accurate electricity consumption control in compliance with EVN standards.