Abstract
This research work is aimed at developing a low-cost security device for intrusion remote sensing, and sends alert notifications to a cloud platform. This device is basically composed of a passive infrared sensor (PIR), an MCU ESP32 microcontroller with integrated Wi-Fi interface and a SIM800L GSM modem. The proposed device incorporates fault tolerance in communication links, integrating dual wireless communication technologies, to guarantee the sending of alerts to the cloud-based framework. The algorithm that has been designed for the microcontroller are enriched with intelligence to detect when a communication service is available or not, and choice best option between the interfaces. Moreover, the device is able to notify alerts via SMS directly to the user's mobile. This solution has proven to be effective not only in the field of security, but it also has applications in scenarios where nodes are required to acquire information from remote sites via telemetry, with guarantees on information delivery.
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