EQUIPMENT FOR MONITORING LOW-VOLTAGE ELECTRICAL CIRCUITS WITHIN BUILDING BY RECORDING DATA AND REPORTING RESULTS THROUGH AN APPLICATION

Abstract

This research aimed to (1) design and develop a low-voltage electrical circuit inspection device for indoor applications, (2) enhance operational safety during circuit testing, (3) verify and identify wire-pair correctness, (4) record inspection data via Google Sheets, and (5) display inspection results on a TFT LCD screen. The research employed a research and development approach. The prototype device was designed and constructed using an Arduino Mega 2560 WiFi integrated with an ESP32, a 16-channel relay module, a TFT LCD display, and an LM2596 buck converter. The system supports inspection of up to 12 wire pairs. Performance testing was conducted using IEC (THW) electrical wires with lengths of 30, 80, and 100 meters under both correct wire-pair configurations and intentionally swapped wire-pair conditions. Inspection results were displayed in real time and recorded through an online application.

          The results showed that (1) the developed device accurately identified and classified all wire pairs as designed, (2) the device significantly reduced safety risks associated with traditional manual circuit inspection, (3) correct and swapped wire pairs were reliably detected across all tested wire lengths, (4) inspection data were successfully transmitted and recorded in Google Sheets, except in areas with insufficient internet signal, and (5) the TFT LCD provided clear and immediate visualization of inspection results.In conclusion, the developed device demonstrates high accuracy, stability, and strong potential for practical implementation in low-voltage electrical inspection tasks within buildings, contributing to improved safety, efficiency, and reliability in electrical installation and maintenance work.