This document describes a home automation system that uses GSM technology and DTMF signaling to control devices remotely using a mobile phone. The system includes a DTMF decoder, logic ICs, transistors, and relays. Pressing buttons on the mobile phone generates DTMF tones that are decoded then used by the logic ICs to activate the relays and control electrical loads such as appliances and robots wirelessly from a distance without needing a separate remote controller.