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1 Interesting 2.0 minutes of Fire Sprinkler Testing – Is this Right or Wrong

https://www.youtube.com/watch?v=e_jxcdKwsRA One day Mithu decided to test his fire sprinker and see if it is working. The water seems to run out fast after less than a minute so I guess they need to do some maintenance. Anyway do you think he has done it correctly? Please comment ... Please divert your questions to Fire Sprinkler Services Read more [...]
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Bomb Comidaz patronising The Sire Bar in Riverside ca

https://www.youtube.com/watch?v=-8HuTNG8Z7E My friend, Mr Bomb went for a nite-out with his friends, showing us the delicious food and atmosphere. Check out sire riverside if you pass by. A taco meal. Chilling out and chit chatting. Read more [...]
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Sagonia Lazarof visiting a celebrity nail salon in charlestown

https://www.youtube.com/watch?v=eeKahJ80Ra8 Any idea what's going on when you visit a celebrity salon? What do they have that is different from your usual salon. Check the video out. BTW, do visit this nail salon charlestown when you are nearby. Read more [...]

Understanding How Capacitive Touch Screen Works

 

https://www.youtube.com/watch?v=BR4wNq6WGkg

 

About

This video is from a student preparing for?Final project for PHY 12 at Tufts, fall semester 2015.

Video Transcripts

Have you ever wondered how the
touchscreen on your phone or laptop
works?

We're here to explain!

These devices use capacitive touch sensors
with property of capacitance to
detect a conductive object like
your finger when it touches the screen.

Before we can explain what a capacitive
touchscreen display is, you need to have a basic
understanding of circuits.

Large Capacitive Touch Screen Monitors & Displays ? faytech North America

A circuit is a closed loop that charge can travel
through at any point in the circuit.

The charges have a voltage or potential
which corresponds to their electrical
potential energy measured from a
reference point called ground.

A battery creates a potential difference which
allows charge to flow around the circuit
and through any circuit elements or
devices connected in the circuit.

A capacitor is a vice that stores electric
charge.

A common type is the parallel
plate capacitor which consists of two
conductive plates and an insulator.

Between them initially, these are
neutrally charged meaning that positive
and negative charges on them.

When you put a battery onto them, the negative
charges accumulate on one side and the
positive accumulate on the other.
The difference in charge creates a voltage
across the capacitor and this voltage
can be used to power another circuit
element like let's say a light bulb.

Capacitance is the amount of charge that
something can hold. The capacitance of a
parallel plate capacitor is modeled by
this equation.

C equals epsilon a over D.

Epsilon I will get to that later.

A is the area of the parallel plate and D is the
distance between the two plates so if
you make the area bigger you're going to
have higher capacitance you make the
distance smaller you get higher
capacitance.

Now epsilon is the
dielectric constant which is a
characteristic of how difficult it is
for charge to move
in the insulator.

Here we're going to show you how a capacitor can be charged
and then used to light an LED.

Touch Screen Monitors & Displays for Sale - faytech North America

First we're going to check that the LED works
by connecting it to a power source through resistor.
The resistor slows down the flow of charge.

The led doesn't burn out . Now we're going to charge the
capacitor by connecting it to the power
source. When we touch the capacitor to
the LED.

The LED lights up notice how the LED fades out.

This is because the resistor keeps all the charge from the
capacitor from flowing through the LED
at once although it doesn't look at the
cylinder. The cool capacitor we used in the
demo is actually a parallel plate
capacitor.

It's made of two conductive
sheets separated by an insulator and
rolled up. You can build a capacitor for
materials you can find at home here.

We've built one by separating two
conductive sheets of aluminum foil with
a sheet of plastic.

So here we have our capacitor even
though it's this big, it actually only
has a capacitance of a couple nano farad.
That is about a thousand times smaller
than what we used to light the LED so we
can't use this one to light an LED.

We can't show you that it will hold
charge. This machine is called an
oscilloscope and the line here shows us
the voltage on the capacitor over time.

So what I'm going to do is I'm going to
hook up the capacitor to a voltage
source and I'm going to disconnect it.
Something interesting is going to happen,
you see how this line curves down.

That shows us that the charge when we
disconnected the battery didn't go away
right away. There was something
holding on to the charge and that
something could only have been our
capacitor.

Now we can look at how capacitive touch screens work.

Let's consider just a single point on your
phone screen so when your finger comes
in contact with the glass of your phone
screen then your finger forms a
capacitor with an electrode that is
underneath the screen.

For now imagine that your finger is actually connected
to ground it might be some other voltage
but the results are the same so your
phone uses a two step process to figure
out this capacitance.

That will tell how far your finger is from the screen
because capacitance changes with
distance so the first thing it does is
it actually puts a voltage on this
electrode and that puts some charge on.

A fundamental equation of capacitors
is that the voltage across a capacitor
is equal to the charge on that capacitor
over its capacitance so this puts a
fixed amount of charge on because this
is a steady capacitance.

We want to figure out the next thing that happens
is the phone disconnecting this voltage
and actually connects this electrode to
ground through a second capacitor.

This capacitors capacitance is known and
since we now have two capacitors going.

That is to ground the total of capacitance
increases since this increases the
voltage right here. It must decrease and
that decrease will actually be related
to the capacitance here so by measuring
the voltage here after making this
connection the phone can figure out
whether it's being touched or not so a
two-dimensional touchscreen is made up
of a bunch of rows and columns of these
electrodes.

It figures out where your
finger is in two dimensions by just
looking at all the electrodes together
and seeing which ones are being touched.

This specific type of touchscreen is
called a self capacitive touchscreen.

It can only accurately detect one touch at
a time. When you touch it with two
fingers, the controller knows the rows
and columns that have been touched but
it can't tell whether the contact points
are here .

Here is a newer form of
touchscreen is called a mutual
capacitive touch screen which can detect
two touches because each row and column
intersection has a capacitor multi-touch
touchscreens that allow you to do things like
zoom in and drag.

For More Information on Capacitive Touch Screen , check out this touch screen manufacturer, Faytech North America

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DirecTV is the Better Deal

When my cable company changed the channel line up, I got upset. While I could still watch my favorite show if I wanted to, it meant that I would have to subscribe to their most expensive package. I didn't think that was fair that they put such a popular channel in the highest priced package, and I decided that I was not going to play their games. I looked at the channel information for DirecTV because I knew that they had some impressive prices for new customers. When I saw that the channel I wanted Read more [...]

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We Wanted a Three Bedroom Apartment

I am a single mother raising two teenage girls. They are 15 year old twins. They are eerily similar in so many ways, but they are distinctively different as well. They share an amazing bond, yet they are their own individual persons too. That is why I have always wanted them to have their own bedrooms, which has not always been possible. When we were forced to move so I could take on a new job, I really hoped that I would be able to find three bedroom apartments in Hattiesburg Mississippi.

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Eating Better Changed My Life

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I knew that I needed to up my exercise, but I also had to understand nutrition a lot better too. I was overweight because I was overeating, but there had to be a reason for it. It did not take me long on that site to finally understand what was going on. I was eating too much food, but I was not getting the right nutrients. I was robbing my body of the things it needed to survive, which meant I was always feeling hungry.

I learned on this site which foods to eat, and I also learned which ones to avoid. I knew that potato chips and candy bars were no good for me, but they were so tasty that I kept going back for more when I had a craving. Well, I started eating the right foods, and those cravings went away. The first couple of weeks were hard, but it was smooth sailing after that. I actually had to buy a new bridesmaid's dress because mine literally hung on me, it was that big. Even better than getting a new dress was having one of the groomsmen ask me out. I don't know where this will go, but I know that I am going to enjoy life from now on!

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I Really Needed a Way to Get More Attention

I had a few different accounts online that I utilized on a regular basis to try to get customers to notice us. I felt like I was not doing a good job with them, though. I could not figure out what makes some businesses stand out so well online, vs. my accounts that seemed mostly quiet. Searching around for a solution gave me a good answer, though. If your account looks quiet, most followers will not be very interested in what you post. That is when you must do something like buy real Instagram followers so that you can get the traffic you need.

People like learning about what other people like. This holds true in any just about endeavor. People like to share what they think others will like. So to help them see interest in something, a business owner can hire someone else to help make their posts look more interesting. It works. I did no quite know if it would work at first, but it did. And it paid our business back handsomely in no time.

To illustrate what I mean about in helping people to see what other people like, there are many different social media sites that allow users to click on something to show their approval. Other people then see this, and they will read the "liked" post and do the same in return. Then, this often makes them want to share what they've seen with others. Other people will then click to show their approval on that shared post. It is pretty smart.

After I paid to have it done to my account, I soon found that people were sharing the things I post more often. I had struggled with getting people to do that previously. Now, I have no trouble at all. People freely click on most things that I put on the account, and more people are coming to my site and purchasing products that I post.

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We Need to Build Up Rural Communities

It's the American dream to find reliable Internet service that doesn't reach steeply into their wallets. Rural customers are often left in the dark without broadband Internet access due to a lack of a digital infrastructure. It can be costly to dig, lay and bury the lines necessary to deliver access to both cable television and digital Internet. Even cheaper Hughes Net prices will inevitably carry a high cost initially. With low populations in most rural communities the service providers have deemed Read more [...]

Great Place for All Types of Sports Packages

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In the past I had satellite television and was not as happy as I thought I should be with the service provider. I am not sure it is with all satellite television, but every time it rained a little I would lose all television for hours at a time. This could not happen if I was in the middle of a football game. When I found your website, I was able to see that you offered the perfect sports packages. Not only did you have a football package, but you also had a baseball package, my second favorite sport. Since I am single I think I will have a few parties to have some of my other single friends over and having a great place to watch movies or sports is always a plus. Most of all I was very happy with the pricing. Some providers were scaring me when I would call and ask for a quote, and they would say they would have to get back with me. In the end I love my provider and glad I found them.

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