DTMF-Based Digitally Controlled Home Automation: Hardware Experimentation and Implementation

The main objective of developing a digitally controlled home automation hardware project is to enable remote control of home appliances through a reliable and functional physical device. The project methodology utilizes the DTMF (Dual Tone Multi-Frequency) system, which eliminates the limitations of conventional wall switches that require physical proximity for operation. The DTMF allows users to control their utilizations by dialing a selected number for a specific load. The system employs a De-Multiplexer, flip-flop IC, and DTMF Decoder to receive commands from the mobile phone and produce a digital output that initiates the electrical relay driver to switch ON/OFF the load utilizations. This technology enables users to send commands to control home appliances using a phone, without requiring a microcontroller. The user must make a call and the system can receive commands from a mobile phone to operate the home appliances. The project uses bulbs to demonstrate the operation of AC loads, and is poweredby a 12V transformer.