Television

How a Remote Control Can Turn a Television on and Off Across a Room

Watching TV has become one of the most encountered ways of spending free time or relaxing. There was a time when, for every channel that we would like to change, we had to move from the couch to the TV, press a button and then go back. Some people probably got tired of this mini-road and decided to invent the remote control. What is a remote control and how it works? A remote control is a wireless device which allows us to operate the house keeping electronics within a short range (from 5 to 15 m). Its technology is based on an infrared protocol or on radio signals both intercepted by a diode made of silicon. We cannot see the whole process because the radiation is in the infra-red range and if you put something between the receiver and the remote you’ll block the signal and the device stops working. This signal is transmitted in 2 different parts: one that recognizes the correct receiver and another transmits the desired action. However, there are universal remote controls too which can deal with a large range of devices. The number and the brands are established by the manufacturer. The technology has evolved and now there are different types of remotes, starting with the classic ones (with buttons) and ending with the touchscreen one. Size and weight are other variables.

A short history of the remote controllers shows us that one of the earliest examples of remote controls was given by N.Tesla in 1898. Five years later Leonardo Tores Quevedo presented Telekino, the first apparatus for radio control. He was considered one of the pioneers of these devices. At the end of the ’30, some manufacturers built some models. They were all connected to the receiver by some wires, and in 1939 Philco Mysteri Control ( a battery with low-frequency radio transmitter) helped that type of remote control to became wireless.

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