The short message system (SMS) of a standard mobile phone can be used for much more than just exchanging cryptic message. This application finds a humble mobile working in a remote site monitoring and controlling external equipments. The SMS service provides by the service providers are comparatively low cost. Hence the system is highly efficient and low cost. It can be implemented for a variety of industrial applications.
In this SMS techniques together with the micro controller technology are used in a wide variety of applications in industry, including computer peripherals, business machines, motion control, and robotics, which are, included in process control and machine tool applications. The automation system is designed by keeping in mind that it should be user friendly and it should be possible to operate it from anywhere in the world. This system is designed in such a way to reduce the wiring complexity and manpower. Thus the system provides an excellent hold as per industrial motion control systems.
Mobile phones have become a widespread means of communication. It becomes a part of everyday life with ever more people enjoying the service and extra freedom they provide. It works on the basis of Global System for Mobile Communication (GSM). A subscriber from any systems can access telecommunication services by using a Subscriber Identify Module (SIM) card in a handset suitable for the network on the visited system The Short Message Service allows text messages to be sent and received to and from mobile telephones. The text can comprise words or numbers or an alphanumeric combination. Because Simple person - to - person messaging is such an important component of total SMS traffic volumes, anything that simplifies message generation as well as extended utility of the SMS being sent is an important enabler of Short Message Service. Such extended utility of SMS fulfills certain important requirements. Keeping this in mind the research work “ SMS BASED INDUSTRIAL AUTOMATION USING PERSONAL COMPUTER " is developed. This system is developed to control the functions of a device from a remote area through the SMS of a mobile phone using personal computer and Micro controller.
The short message service (SMS) of a standard mobile phone can be used for much more than just exchanging cryptic message. This application finds a humble mobile working in a remote site monitoring and controlling external equipment. This system accommodates the SMS techniques together with the micro controller technology that are used in a wide variety of applications in industry via computer peripherals, business machines and robotics that are related to process control and machine tool applications. This Automation system is designed in such a way that it has to be user friendly and it must be possible to operate it from anywhere is the world.
EMBEDDED SYSTEMS - AN OVERVIEW
Breathtaking developments in microelectronics, processors speed and memory elements accompanied with dropping prices have resulted in powerful embedded systems with a number of applications.The intelligence of smart devices resides in embedded systems. An embedded system in general incorporates hardware, operating system, low level software binding such as, peripheral devices and communication software to enable the device to perform pre-defined functions.
A plethora of processors are variable to cater to different applications. 8 bit, 16 bit and 32 bit processors are available with different processing powers and memory addressing capabilities. Advanced Digital Signal processors (DSPs) cater to AV coding and image processing. Embedded systems are built around processor boards. These processors boards incorporate necessary RAM, ROM and peripheral such as USB port and serial port.
DSP based embedded systems are available for diversifications, with circuitry being specific to the application on hand. Sensors, transducers, relay I/O devices and special circuitry interfaces to the processor board are the various elements in action.
We stand to immensely benefit from modern embedded gadgets armed with powerful processing, adaptable memory, and sophisticated software managing complex information and communication protocols. In the future smart gadgets would connect and initiative action on our behalf.
The short messages such as stepper on, stepper off etc, (at a time only one) are delivered to the Nokia mobile phone, which is kept at the receiving end from the transmitting section using a mobile phone. In the receiver section this mobile is connected to the personal computer through the com port. The master micro controller is connected to the parallel port through the octal buffer and line deriver. The port 0 of the micro controller is connected to the stepper motor driver through the actual buffer and line driver. The stepper motor whose motion to be controlled, is connected to a driver. Another port (i.e.) port 2 of the micro controller is connected to the LED indicators via the octal buffer and line driver. The necessary power required to all the parts are supplied by the suitable power supplies.
Messages such as stepper on, stepper off etc to control the motion of the stepper motor are received by the mobile phone kept in the receiving side and are read by the personal computer for which the software for Nokia PC connectivity is enabled. To control the various motion control operations of the stepper motor from remote place, the Front End Design as well as application is developed using Visual Basic 6.0. The application always monitors the inbox of the mobile and the received SMS is accepted only if the transmitted mobile phone number is available in the database of it. If not, simply it shows the message.
"Received message from unauthorized phone" and message will be deleted. It shows the design and ensures that the system is highly protected and cannot be operated by any unauthorized persons.
When any message with one of the above commands (stepper on, stepper off, etc) received from the authorized mobile phone number the application sends corresponding information to the micro controller through the interfacing device (octal buffer and line driver). The micro controller reads the data and delivers the corresponding information to control the motion of the stepper motor. At the same time the corresponding LED will indicate the status of the motion what is going on. Which indicate the various commands received by the mobile and during the sequence of operations performed.
The maximum speed or minimum is reached when the corresponding command is continuously send to the receiving mobile. During that time, the message “can’t increase the above current speed” “can’t decrease the above current speed” will get displayed in the screen. The system is capable of continuously functioning round the clock.
RESULTS AND DISCUSSIONS
The developed system " SMS BASED INDUSTRIAL AUTOMATION USING PERSONAL COMPUTER " is used to control the functions of a device from a remote area through the SMS of a mobile phone using personal computer and micro controller.
From the transmitting section using a mobile phone, short messages are delivered to the Nokia Mobile Phone. In the receiver section this mobile is connected to the Personal Computer. This in turn is connected to micro controller, which controls the motion of the stepper motor. This system is designed in such a way that it has to be user friendly and it must be possible to operate it from anywhere in the world.
It compensates all the drawbacks of the landline telephone due to the inclusion of enhanced feedback and monitority facility. It acts as a better remote mobile operation. This project can be modified according to the industry requirements. Only an attempt has been made here to control the motions of the stepper motor using this developed system. This could be further more researched, wherein the same application can be utilized to control any other hazardous devices or similar devices in place of the stepper motor.