Home automation systems have been developed recently using various technologies, such as the Internet, wireless networks, Bluetooth, and voice commands, among others. Our proposed research provides a cost-effective system that helps know and control the status of different home appliances. The technology here is the Global System for Mobile Communication (known as GSM), and the central processing unit of this system is the NXP LPC11U24 microcontroller unit (the ARM “mbed” microcontroller), which is designed especially to prototype low-cost Universal Serial Bus (USB) devices and other applications that are battery powered.