📄 device control using telephone electrosofts.com.htm
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<font size="5" face="Verdana">Device Control using telephone<br>
</font></b></p>
<p style="margin-top: 0pt; margin-bottom: 0pt;" align="right"><b>
<font face="Verdana">Nagabhooshan S. Shet</font></b></p></td>
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<span style="font-weight: 700;"><font size="2" face="Verdana">Controlling
devices using switches are common. From a few decades controlling devices
using remote control switches like infrared remote control switch,
wireless remote control switches, light activated switches are becoming
popular. But these technologies have their own limitations. Laser beams
are harmful to mankind.</font></span></td>
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<p style="margin-bottom: 0pt;" align="justify">
<span style="font-weight: 700;"><font size="2" face="Verdana">
Some technologies like IR remote control are used for short
distance applications. In such case if we have system which does not
require any radiations or which is not harmful, long remote control
switch!! Yes here is the solution. Here I am introducing such a system
which does not require any radiations, any laser beam which has no
limitation of range, I mean it can be used from any distance from meters
to thousand kilometers using a simple telephone line or mobile phone.
</font></span></p>
<p style="margin-bottom: 0pt;" align="justify">
<span style="font-weight: 700;"><font size="2" face="Verdana">
Here I am using a telephone as a media, which serves main part of this
system, by using home phone as a local phone and another phone, either
landline or mobile phone as a remote phone.</font></span></p>
<p style="margin-bottom: 0pt;" align="justify">
<font color="#800080" size="2"><i>
<span style="font-weight: 700; font-family: Verdana;">Features:-</span></i></font></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">1.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">You can control up to 10
devices. It may be any electric or electronic appliances or devices with
simple to heavy appliances. Each device is given a unique code.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">2.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">It makes accurate switching,
any false switching of device are not done.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">3.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">There is no risk for false
switching.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">4.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">Your local phone (i.e., home
phone or office phone) can be used for normal use by using a DPDT switch.
So you need not use a separate telephone line for this device controlling.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">5.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">To perform any operations
through remote phone line, the user needs to dial to the local telephone
(to which the interfacing circuit is connected) then the respective code
of the device is dialed.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">6.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">This circuit does not require
any complex IC, so any one with little knowledge of electronics can
construct this circuit, because it does not need any programmable IC's or
programming.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">7.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">This system detects the
ringing signal from your exchange with the help of ring detector and
automatically switches ON.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">8.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">This device saves your money.
This circuit switches OFF after a time of 60 seconds (you can change this
switch ON-Time which is discussed in detail in coming section).</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<b><font size="2" face="Verdana">9.</font><span style="font-style: normal; font-family: Verdana; font-variant: normal;"><font size="2">
</font></span><font size="2" face="Verdana">Before changing the state of
the device we can confirm the present status of the device.</font></b></p>
<p style="margin: 5pt 0in 0pt 0.5in; text-indent: -0.25in;" align="justify">
<span style="font-weight: 700;"><font size="2" face="Verdana">10.This
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