Sistema IoT de etiqueta eletrônica para atualização remota de preços no mercado varejista

Abstract

This paper presents the development of an Internet of Things (IoT) Electronic Shelf Label (ESL) system based on the ESP32 microcontroller and a 2.9‑inch e‑paper display, aimed at replacing conventional paper labels in small and medium‑sized retail stores. The proposed solution enables remote updating of price and product information, including QR codes with nutritional or complementary data, through a desktop application developed in C on Visual Studio 2022 that communicates with multiple ESLs over Wi‑Fi. The hardware architecture integrates an ESP32 DevKit V1, a Waveshare 2.9‑inch e‑paper display, two Li‑Ion 18650 batteries, and a MP1584 step‑down converter, assembled on a custom PCB designed for low power consumption and ease of maintenance. The methodology comprised circuit modeling and simulation, hardware prototyping, firmware development, and experimental evaluation of update time, communication reliability, range, energy consumption and unit cost.