Structonex: A Low-Cost ESP32-Based Vibration Detection and Alert System with Buzzer and Smartphone Notification

Events at construction sites happening at unexpected time can have an adverse impact on temporary constructions like scaffolding, ladders or props installed on the site. Some vibration might be unnoticed because of the absence of the supervisor. Manual inspection cannot monitor the site all the time. Modern industrial vibration monitors can be too expensive. This paper presents Structonex, a low-cost Internet of Things IoT prototype that detects construction events and sends an alarm message. The SW-420 vibration sensor module sends its output signal to ESP32 microcontroller. As soon as a new event occurs, ESP32 sends a signal to a buzzer for a fixed period of time. Using built-in wireless interface, ESP32 sends a message to the user’s smartphone through Blynk IoT app. There is a three-second gap between signals. Sensitivity is regulated with the help of potentiometer located on the module. Timing settings can be changed in firmware. The article presents a detailed account of design, the actual circuit and of the software code answering message