19-04-2014, 12:15 PM
UNIVERSAL IR SWITCH A Seminar Report
UNIVERSAL IR .doc (Size: 274.5 KB / Downloads: 22)
ABSTRACT
This is a single channel IR remote control. It is easy and cheap remote control then this is the best one. This may be the easiest remote control to build. Using this remote control you can operate (ON/OFF) a single device from a remote place. Device may be AC or DC operated. Here I have used it to ON/OFF any AC device which operates on 230V like fan, bulb, tube-light, table -lamp. The range of this remote control is around 10 meters.
INTRODUCTION
In modern electronics, electronics remote control system is well known system. Infrared remote control kit’s available in the market are quite expensive and it some one wishes to assemble one, their I C’s may not be easily available. More over for simple ON-OFF function such as controlling a lamp or fan we do not need very complex circuit .The IR remote control circuit using photo diode and photo transistor sensor suffer from major drawback of being affected by ambient light and a very low range .The IR remote control circuit described here can be used for any simple ON-OFF function. This system has memories application than other remote control system .The advantage is that this circuit is absolutely free form ambient light interference and provides control range of any to focusing lens .The components use in this system is in so convenient manner that whole assemble is easier to built. This reduce complex city of the system.
CAPACITOR
A capacitor (formerly known as condenser) is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator). When there is a potential difference (voltage) across the conductors, a static electric field develops in the dielectric that stores energy and produces a mechanical force between the conductors. An ideal capacitor is characterized by a single constant value, capacitance, measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them
Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass, in filter networks, for smoothing the output of power supplies, in the resonant circuits that tune radios to particular frequencies and for many other purposes.
The effect is greatest when there is a narrow separation between large areas of conductor; hence capacitor conductors are often called "plates", referring to an early means of construction. In practice the dielectric between the plates passes a small amount of leakage current and also has an electric field strength limit
IR SENSOR :
The receiver uses an infrared sensor module which is commonly usedin colour television for sensing the IR signals from the transmitter section. Thesensor module shown in Figure incorporates a detector diode, an SMD ( surfacemounted device ) IC which consists of a band pass filter, an amplifier and ademodulator on a small pcb placed inside a small tin cube enclosure to get rid of unwanted electromagnetic interference.Photodiodes and phototransistors are often used as the sensingelements at the receiver end of an optodata transfer system, such as a light-beamswitch or alarm or remote control system, etc., in which data is sent to the receiver via an opto carrier wave.In such applications, to signal reaching the photosensor may at sometimes be very weak and at other times very strong. Also, the sensor may besubjected to a great deal of noise in the form of unwanted light ( visible or invisible)signals, etc. Top help minimize these problems, the link is usually operated in theinfrared range, and the opto sensor output is passed to processing circuitry, viz., alow noise pre amplifier with a wide dynamic operating range. Figure show typicalexamples of such circuits, using photodiode sensors.Sensor used here is i838 tsop.
WORKING
Just like your personal computer, switch your home appliances on/off just at the click of a button. All we need here is a wireless device that performs your switching operations. The IR Remote Switch available at Multyremotes.com may prove your best search. An IR Remote switch is a remote control which can switch on/off any electric appliance, be it AC OR DC like fan, table lamp, tube-light, bulb, etc.
It is a sound, engineering product which bears a transmitter and a receiver. The transmitter unit is integrated on the remote control and the receiving unit is fixed at the appliance under control. The operating range of this switch is around 10 metres. The remote bears its name after the infrared (IR) sensors used to detect the signals of the transmitter at the receiving unit. This is what that substitutes the use of wires in the system. The remote control also bears a red Led for convenience which glows whenever the user pushes the button to switch the appliance on/off. Grab it for an easy and handy experience with your home appliances and that too, economically.
Whenever an input signal is given to the remote, it generates a continuous wave pulse with the help of pulse generator (a multivibrator) which switches on the IR led. The IR signals hence generated by the led are detected by the sensor at the receiving unit. The sensor then intimates the device to alter its current state of operation accordingly with the help of a J-K flip-flop. Thus every alternate time the switch is pressed, the appliance turns on or off.
CONCLUSION
This concludes the theory of operation for IR remote control systems intended for use in consumer electronics. I realize that other ways exist to implement IR control, but I will limit myself to the description above. One of the issues not covered here is security. Security is of no importance if I want to control my VCR or TV set. But when it comes to opening doors or cars it literally becomes a 'key' feature!