GSM-Based Advanced Multi-switching DTMF Controller for Remotely Monitoring of Electrical Appliances

摘要

This paper presents the design and implementation of a GSM-based dual-tone multi-frequency (DTMF) controller for remotely monitoring of electrical appliances. The present system provides an added feature like the secure connection with a passcode and reliable control of various devices without perturbation. The device can be controlled from any location using a mobile phone. For this, one has to make a call from a cell phone to control the electrical appliances. Since mobile phones are available with everyone, it will be much easier to employ this technology in practical life. In this paper, the main focus is on the controlling of more devices without ambiguity. The developed system is cost effective and can be used to control up to 128 devices with a secured connection unlike the 8-12 devices in the conventional systems.