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Infrared Laser Pointer

Infrared Laser Pointer . Mutalip KURBAN. Introduction Characteristics and key features infrared communication standards How IrDA Transmission Works Conclusion and Future of the IRDA. Introduction.

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Infrared Laser Pointer

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  1. Infrared Laser Pointer Mutalip KURBAN

  2. Introduction • Characteristics and key features • infrared communication standards • How IrDA Transmission Works • Conclusion and Future of the IRDA

  3. Introduction • The Infrared Data Association, often referred to as IrDA, is a nonprofit organization whose goal is to develop globally adopted specifications for infrared wireless communication. Celebrating its ten-year anniversary, IrDA was formed in 1994. It thrives today due to the hundreds of corporate and individual members who volunteer their time and know-how to the continued development of IrDA applications and specifications.

  4. Introduction(cont) IrDA takes a layered protocol approach specifying several layers of protocols including 1- IrPHY (physical layer), 2- IrLAP (link access protocol) and 3- IrLMP (link managment protocol).

  5. Characteristics and key features of the IrDA connection • An IrDA infrared connection is established solely by a directed infrared beam, for bi-directional half-duplex communications. The lowest signaling rate is 9,600 bps, and the highest currently specified is 16 Mbps.

  6. Characteristics and key features(CONT) • Nevertheless, most devices available today operate at a maximum of 4 Mbps. The range of the line-of-sight connection is at least 1 meter, but, typically, 2 meters can be reached.

  7. Characteristics and key features(CONT) • There is also a low power version available with a limited range objective of 20 cm, but at 10 times less power consumption. IrDA connections are suitable for point-to-point and even point-to-multipoint. IrDA is very popular with portable devices, such as notebooks, handheld computers, digital cameras, electronic books, toys, and watches.

  8. SIR, FIR,VFIR SIR Slow infrared: (IrDA 1.0 Standard), which is the capability to transmit data at 9.6 kbps to 115.2 Official IrDA definition is serial infrared • FIR Fast infrared :(IrDA 1.1 Standard), which is the capability to transmit data up to 4 Mbits/sec. • VFIRVery fast infrared :16 Mbps

  9. infrared communication standards • IrDA-Data defines the standard for the wireless, two-way infrared data transmission between two devices and consists of a set of mandatory protocols: PHY (Physical), IrLAP (Link Access), and IrLMP (Link Management).

  10. infrared communication standards(CONT) • IrDA-Control is the infrared standard that allows wireless peripherals such as keyboards, mouse, game pads, joysticks, and other pointing devices to interact with many types of host devices. Host devices include PCs, home appliances, game consoles, and TV/Web set top boxes.

  11. infrared communication standards(CONT) The benefits for IrDA-standard infrared connection technology includes, • Offers a universal wireless standard for connecting all portable infrared-enabled devices • Easy, effortless implementation • Economical alternative to other connectivity solutions • Reliable, high speed connection • Safe to use in any environment; can even be used during air travel • Eliminates the hassle of cables • Allows PC’s and non-PC’s devices to communicate with each other • Enhances mobility by allowing users to simply “plop and connect”

  12. What is the difference between direct infrared, diffuse infrared, and radio frequency? • Direct infrared is a point-to-point, typically one-to-one communication. Which requires line of sight and is a secure form of data transmission and reception.Hoya IrDA-standard wireless infrared solution is an example of direct infrared.Diffuse infrared allows many-to-many connections, does not require direct line of sight and can be uni-directional or bi-directional. Since it is based on visible light, it is a secure form within a room. Financial trading floors are an example of diffuse infrared. Radio frequency is not secure in that it can penetrate through walls and is subject to uncontrolled interference. It is typically higher in power consumption than directed infrared and requires FCC certification.

  13. How IrDA Transmission Works • The transmission in an IrDA–compatible mode (sometimes called SIR for serial IR) uses, in the simplest case, the RS232 port, a built–in standard of all compatible PCs. With a simple interface, shortening the bit length to a maximum of 3/16 of its original length for power–saving requirements, an infrared emitting diode is driven to transmit an optical signal to the receiver. • This type of transmission covers the data range up to 115.2 kbit/s which is the maximum data rate supported by standard UARTs (see figure 1). The minimum demand for transmission speed for IrDA is only 9600 bit/s. All transmissions must be started at this frequency to enable compatibility. Higher speeds are a matter of negotiation of the ports after establishing the links.

  14. How IrDA Transmission Works(cont) • Higher speeds require special interfaces which operate at 1.152 Mbit/s and use a similar pulse–shortening process as in the RS232–related mode, but with a pulse reduction to of the original pulse length. The fastest data rate supported by IrDA is 4.0 Mbit/s (often called FIR), operating with 125–ns pulses in a 4–PPM (PPM = Pulse–Position Modulation) mode.

  15. AT89C55WD The AT89C55WD is a low-power, high-performance CMOS 8-bit microcontroller with 20K bytes of Flash programmable read only memory and 256 bytes of RAM. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry standard 80C51 and 80C52 instruction set and pinout.

  16. Infrared Photo Transtor - TK69 TSOP1738 • The TSOP1736 is a 3 pin device that receives the infrared bursts and gives out the demodulated bitstream at the output.

  17. Phillips RC5 • Most audio and video systems are equipped with an infrared remote control.A common used standard protocol for infrared data communication is the RC5 code, originallydeveloped by Phillips. This code has an instruction set of 2048 different instructions and is divided into 32 addressof each 64 instructions. Every kind of equipment use his own address,so this makes it possible to change the volume of the TV without change the volume of the hifi

  18. Phillips RC5 • The transmitted code is a dataword wich consists of 14 bits and is defined as: • 2 startbits for the automatic gain control in the infrared receiver. • 1 toggle bit (change everytime when a new button is pressed on the ir transmitter) • 5 address bits for the systemaddress • 6 instructionbits for the pressed key

  19. Phillips RC5 • The duration time of each bit is equal to 1,778 ms, and the total time of a full rc5 code is 24,778 ms.

  20. Futer of IRDA • Infrared port will soon be seen in copiers, fax machines, overhead projectors, telephones, bank ATM's, credit card readers, game controls, and headsets, …etc.

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