Infrared interface
Infrared communication is a kind of cheap, close, no wiring, low power consumption and strong secrecy communication program. in PC machine is mainly used in wireless data transmission but has gradually begun widely used in wireless network access and near distance remote control for home appliances. In view of the many advantages of infrared communication, and now almost all motherboards offer that an infrared interface for users easy to use it for communication with the device(infrared interface), such as notebook computers, printers, Modem, handheld computers, mobile phones and so on. But the computer motherboard only provides the infrared transmitting and receiving device interface, does not provide a complete, so users still need to purchase the infra-red connector when user want to use infrared communication.
The component selection
Select and test primarily components— receive launch tube and tubes.
1 test the infrared emission tube: infrared emission tube is actually special diodes(or is IR led strips), with a resistance profile measurement of millimeter , the launch tube reverse resistance is infinite, the forward resistance is generally about 500K. If you have a laptop, you can Take an infrared interface to PC and GND leads IRTX two lines, IRTX connect the positive launch tube, GND connected to the negative of the launch tube, the alignment of the launch tube infrared emission windows laptop, the infrared monitoring device of notebook computer “will find your PC”.
2 test the infrared receiving tube, infrared receiving tube is a diode, the forward resistance more than 500K, and is not affected by illumination, reverse resistance in the absence of direct light, generally more than 300K, the glare should be less than 10 ohm, sometimes is negative, because the PN junction diode will get electricity when the light energy into strong light，and formation of the 0.7V. node voltage .because in the light irradiation the PN junction diode, light will be converted into electrical energy, the formation of the node voltage 0.7V.