IrDA port adapter for computer. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / infrared technology

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Today, many cell phones are equipped with an IrDA infrared port, with which it is easy to establish communication with a personal computer that has a similar port.

Although most computer motherboards have an integrated IrDA controller, the difficulty lies in the fact that the port adapter (the IR transceiver itself) is usually not included in the kit, and it is difficult to purchase it separately. The proposed home-made IrDA adapter, which is easy to manufacture and does not contain scarce parts, will solve the problem. It has been tested with various motherboards with Pentium - Pentium 4 processors under Windows 98/2000/XP operating systems.

The adapter diagram is shown in fig. one.

Fig. 1

Its transmitting unit is a pulse amplifier based on a VT3 transistor, the collector circuit of which includes an IR emitting diode VD2 and an HL2 LED - a transmission signaling device. The receiving part consists of an IR photodiode VD1 and an amplifier based on a transistor VT2. Transistor VT1, opening during transmission, shunts the emitter junction of transistor VT2, preventing the reception of its own signals. LED HL1 allows you to visually monitor the reception. +5 V circuits, RX (received signal), TX (transmitted signal), and Common. connect with a four-wire cable (for example, a telephone cable) to the corresponding pins of the IrDA port connector on the computer motherboard. The purpose of the contacts can be determined by the inscriptions on the board or in its documentation.

Fig. 2

The adapter is assembled on a single-sided printed circuit board measuring 16x25 mm (Fig. 2). It is shown on a 2:1 scale and is designed for surface mount resistors. They and the capacitor C2 of the same design are installed on the side of the printed conductors. To use conventional resistors and a capacitor, the dimensions of the board will have to be increased.

Instead of KT3107K transistors, others of the same series or KT361, KT502 series are suitable. Replacement for the KT3102A transistor - any of the KT3102, KT315, KT503 series. LEDs of the AL307 series, if necessary, can be replaced with any diameter of 3 or 5 mm, and the HL1 LED (reception indicator) is preferably green, and HL2 (transmission indicator) is red.

The AL156A emitting diode can be replaced with another IR range, including one removed from a faulty TV remote control. Replacing the photodiode FD-263-01 with a slower one is undesirable, this will lead to a noticeable decrease in the speed of information exchange.

After connecting the adapter to the computer motherboard, you need to run the BIOS Setup program and enable the IrDA controller in the Integrated Peripherals item (it may be called differently in different versions of the program). The computer's operating system should then automatically detect the "Built-in IR Device". To work with a cell phone, you may need to install a special driver software.

See also: Serial IR PC port or dongle

Literature

1. L. Ryazantsev, Tambov. Magazine "Radio", 2005

Author: programmer; Publication: cxem.net

See other articles Section infrared technology.

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