'Recent remote controls use infra-red(IR) rays and a special binary (0 and 1) coding mechanism. The code, intensity and wavelength of the IR wave, help to select different functions. Depending on the key pressed, a signal is sent out by IR source say, an injetion laser diode(ILD). It generates a code in parallel format. This is converted to a series format by s shift register. This signal is received by photo-sensitive devices such as an avalanche photo diode at the receiver.

Here another shift register is used to convert the code back to a parallel form. This operates a one-of-n decoder, which selects one function from a set of ''n'' predefined functions and executes it'

n consumer electronics, a remote control is a component of an electronic device such as a television set, DVD player, or other home appliance, used to operate the device wirelessly from a short distance. Remote control is a convenience feature for the consumer, and can allow operation of devices that are out of convenient reach for direct operation of controls.

A transmitter is often a light emitting diode (LED) which is built into the pointing end of the remote control handset. The infrared light pulses form a pattern unique to that button. The receiver in the device recognizes the pattern and causes the device to respond accordingly.

In consumer electronics, a remote control is a component of an electronic device such as a television set, DVD player, or other home appliance, used to operate the device wirelessly from a short distance. Remote control is a convenience feature for the consumer, and can allow operation of devices that are out of convenient reach for direct operation of controls.

Commonly, remote controls are Consumer IR devices which send digitally-coded pulses of infrared radiation to control functions such as power, volume, tuning, temperature set point, fan speed, or other features. Remote controls for these devices are usually small wireless handheld objects with an array of buttons for adjusting various settings such as television channel, track number, and volume. For many devices, the remote control contains all the function controls while the controlled device itself has only a handful of essential primary controls.

Earlier remote controls in 1973 used ultrasonic tones. The remote control code, and thus the required remote control device, is usually specific to a product line, but there are universal remotes, which emulate the remote control made for most major brand devices.

Remote control has continually evolved and advanced over recent years to include Bluetooth connectivity, motion sensor-enabled capabilities and voice control

1 You may already know something about the EM (electromagnetic) spectrum. The light we see is part of the EM spectrum. Radio waves, microwaves, and X-rays are part of it, too. Another part is called infrared. Like all parts of the EM spectrum, infrared is a kind of energy that moves in waves. Our eyes can't see infrared waves. We can't see radio, microwaves, or X-rays, either. Infrared waves act in the same ways that light does. Infrared is reflected, or bounces off, light things better than dark things. It is absorbed by dark things better than by light things. Light travels in a straight line and so do infrared waves.

2 Your TV remote sends out a beam of infrared waves. It sends out different codes for different commands. The TV set receives the beam. A microchip inside the TV 'reads' the beam, much like your brain 'reads' the signals sent to it by your eyes. The microchip tells the TV what you want it to do. The remote can tell it to turn the volume up or down. The remote can tell your TV to change channels.