Nader Barsoum
Wireless monitoring and control is the new technology that most of the nations are interested in since majority of the people are now using the cellular phone. Smart phone can now control many of the appliances of electric goods or lights as well as the motor speeds at the factories or workshops. The phone can also monitor the values of most of electrical or mechanical variables or even the human body functions like blood pressure, heart beat or oxygen. This technology is based on an automatic electronic and programming switch that can be built in a receiving circuit connected to any load, which detect the wireless transmitted signal and translated into an operating signal. The transmitted signal is generated from the mobile phone either by push button (touching a key) using DTMF (Dual-Tone Multi-Frequency) or by SMS (Short Messaging Service). This is preceded by dialling the number of the SIM card (Subscriber Identity Module) of the receiving circuit. This circuit consists of GSM board (Global System for Mobile Communications) and Arduino Uno microcontroller board plus other components such as resistances, capacitances, inductances, relays, transformer, decoder, transistors and converters. These electronic circuits are supplied by 3 to 5 volt or sometimes 12 volt, so adapter device is also involved with the components. This technology is only used the mobile functions, not the internet features, but depends on the mobile networks which allow the objects to be controlled from very far distance (from country to another country, from home to workshop or hospital). Unlike the other technology which works at small distance such as remote infrared Bluetooth, Wi-Fi, or line communication. In this paper, this technology will be highlighted showing the hardware circuits of light and speed control of AC and DC motors with their process and security system on the phone keys.
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