How TV remote works?

                                        Almost all of us from the young child to an old person use the TV remote control a number of times during a day, but only a few of us will think of how this small device in your hands works just when you press a button.But they might have been a popular question among those how does a single IR transmitter can transmit signals of different buttons we press. Those of who desire to know how this device works, here is the answer for them.

                                          Have you ever removed the back cover of your remote control? Those who have done it, they must have found a printed circuit board, the electronic parts of which are connected to the battery contacts which you in your remote. The circuit which you see printed under the back cover of your TV remote is known as integrated circuit which is actually called as printed circuit board or PCB. It is also called a chip in a common.

                                           There are seven types of waves that make up the electromagnetic spectrum: radio waves, microwaves, infrared radiation, visible light, ultraviolet light, x-rays, and gamma rays. Different types of electromagnetic radiation are actually just names for specific ranges of wavelength. As you go along the electromagnetic spectrum, wavelength decreases, and energy increases.You also must have heard of certain terms like radio waves, microwaves, X-rays and infrared which are part of an electromagnetic spectrum.  Radio waves have the longest wavelength, and the lowest energy, while gamma rays have the shortest wavelength and the highest energy.

                                              Here we are concerned with infrared rays which light signals which move in the form of waves to your TV from your TV remote control on clicking a button in the remote.
                                               Have you ever noticed, that these waves cannot reach the TV if you stand in between your TV sensor and your remote device? The pressing of the button on the remote translates your action into infrared light signals which are received by your TV and will not work if you obstruct these signals to reach the point of their destination on your TV. This happens because the infrared rays travel in straight line and cannot pass through an obstruction. The integrated circuit or chip of your remote is packaged in an 18 pin dual inline package also called DIP. To the right of this chip, you will find a diode, a transistor with three leads, a yellow coloured resonator, two resistors, and a capacitor. Again, you will find a resistor and capacitor next to the battery contacts of your TV remote. The integrated circuit starts its function when a button on the TV remote is pressed. Your pressing of the button on the remote is detected by the chip and it translates it into a strips of digital data which varies with commands which is similar like the MORSE code. The circuit is so constructed so as to create a different sequence for different buttons on your TV remote. The chip then sends the signal out to the transistor to amplify the signal that finally is transmitted to your TV making it to work.

                                             The TV receiver recognizes each frequency, and uses that to distinguish between commands.   A microchip inside the TV READS the beam, much like the human brain, READS the signals sent to it by the eyes. The microchip tells the TV what it should want to do as it controls the TV working. The remote can tell it to turn the volume up or down or even change the channels. Remotes can send messages to the TV in a straight line.
                                               Nowadays mobile phones are used as remote since it is manufactured with inbuilt IR sensors so in mobile phones too it works as the same  way instead of buttons in remote we have touch screen that's the difference.

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About Sooriyamathy

This blog is created to explain people the concepts, which they are finding difficult to understand in electrical and electronics world. This blog also post stuff related to stargazing.