SMS-based ON/OFF monitor for electronic devices

This document presents the design and implementation of a platform that detects the ON/OFF state of any electronic device and show this information through an Internet web site despite the absence of any Internet network. The device state is defined through a current sensor, the information is saved with date in a backup memory, and then, a Short Message Service (SMS) message containing the ON/OFF state is sent to a massive message platform on the Internet. After that, the information is collected in a custom web platform where the user can access through the Internet and see the electrical status of the device. Additionally, the platform works even when there is not AC power supply.