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circuit diagram of home automation with dtmf decoder at89c51 using mobile communication


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Created at: Wednesday 03rd of April 2013 12:00:32 AM
Last Edited Or Replied at :Wednesday 03rd of April 2013 12:00:32 AM
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ppt slides on home automation using mobile communication in wikipedia


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Created at: Tuesday 23rd of October 2012 01:26:55 PM
Last Edited Or Replied at :Wednesday 24th of October 2012 02:35:45 AM
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i want pp..................[:=> Show Contents <=:]



HOME AUTOMATION USING MOBILE COMMUNICATION


Posted by: projectsofme
Created at: Friday 26th of November 2010 12:59:42 AM
Last Edited Or Replied at :Friday 03rd of February 2012 10:43:13 PM
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high immediately when digital algorithm detects a valid tone pair (signal condition). Any momentary loss of signal condition causes ESt to return to low state. Pin 17 of IC3 connected to capacitor C11 is bidirectional, acting as steering input/guard time output (St/GT). A voltage greater than threshold of steering logic VTSt detected at St causes the device to register the detected tone pair. The guard time output resets the external steering time constant, and its state is a function of ESt and voltage.
The 230v AC main is stepped down by transformer X1 to deliver the secondary output of ..................[:=> Show Contents <=:]



GSM BASED HOME AUTOMATION


Posted by: computer science crazy
Created at: Wednesday 16th of September 2009 03:30:24 PM
Last Edited Or Replied at :Wednesday 19th of December 2012 10:32:49 PM
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range of applications.

An AVR microcontroller is used to control the home appliances and it will communicate to the GSM modem through the serial port of controller. Most of the home appliances are connected to AC mains so, a special care is to be taken to switch the appliances..................[:=> Show Contents <=:]



GSM Security And Encryption


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:56:49 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:56:49 PM
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which are transmitted in the clear in analog systems. With more complicated equipment, it is possible to receive the ESN and use it to commit cellular telephone fraud by cloning another cellular phone and placing calls with it. Estimates for cellular fraud in the U.S. in 1993 are as high as $500 million. The procedure wherein the Mobile Station (MS) registers its location with the system is also vulnerable to interception and permits the subscriber's location to be monitored even when a call is not in progress, as evidenced by the recent highly-publicized police pursuit of a famous U.S. at..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:47:45 PM
Last Edited Or Replied at :Sunday 30th of October 2011 10:56:23 PM
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Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:49:27 AM
Last Edited Or Replied at :Tuesday 02nd of November 2010 07:23:59 AM
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is intended to address these problems. GSM provides recommendations, not requirements. The GSM specifications define the functions and interface requirements in detail but do not address the hardware. The reason for this is to limit the designers as little as possible but still to make it possible for the operators to buy equipment from different suppliers. The GSM network is divided into three major systems: the switching system (SS), the base station system (BSS), and the operation and support system (OSS).

The operations and maintenance center (OMC) is connected to all equipment in the s..................[:=> Show Contents <=:]



4G Wireless Systems


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:25:17 AM
Last Edited Or Replied at :Tuesday 14th of February 2012 11:23:35 PM
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aking their appearance in late 2002 and in 2003, are designed for voice and paging services, as well as interactive media use such as teleconferencing, Internet access, and other services. The problem with 3G wireless systems is bandwidth-these systems provide only WAN coverage ranging from 144 kbps (for vehicle mobility applications) to 2 Mbps (for indoor static applications). Segue to 4G, the next dimension of wireless communication. The 4g wireless uses Orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB), and Millimeter wireless and smart antenna. Data rate of ..................[:=> Show Contents <=:]



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