Communication on IRDA for computer. Scheme, description

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Communication on IRDA for computer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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Communication on IRDA for computer

Receiver circuit in fig. 1. Transmitter circuit in fig. 2. Wiring of the IR connector in fig. 3. Speed table in fig. 4..Now about the design: While I did not shield this microcircuit, I thought it did not work. On a double-sided textolite, we cut small squares under the legs, solder the microcircuit. We cut out the screen from the can and close the entire structure, connect the lower part of the textolite with the screen. You can try to start without a screen by lowering the sensitivity by adding R4, but it doesn't work so well. The maximum baud rate I was able to achieve was 38.4 kbaud. This corresponds to 4.88 µs, (204,918 kHz). The restriction is introduced by K1056UP1. It is possible that changing C1, C2, C3 is required to increase the frequency, but I did not succeed (although I just shorted the capacitances, and did not change them).

At 19.2 kbaud, the connection is confident, at 57.6 kbaud, the transmission starts, but in one or two seconds it turns from good to very bad until the connection is broken. I think the microcircuit simply detects these pulses as interference and reduces the sensitivity. And yet you don’t need to shine a laser (or LED) from a distance of 1 m directly into the photodiode, this causes it to oversaturate and the speed drops to 2400, if you have small distances, put a sheet of thick paper in front of the photodiode. The circuit is not afraid of flare, a 100 W lamp from a distance of 10 cm did not affect the work in any way. For indication, I put an LED with a 3 Ohm resistor in parallel with R100, then the incoming signal can be seen visually. Before connecting to a computer, apply 5V to the circuit and shine with any remote control (from a video recorder, TV set, SD). I put the resistor R3 for the laser, so that it barely glowed. I think this will increase the speed and extend the life of the laser. TTL levels, there is an RXH signal in the 7-pin connector, I don’t know what it is and therefore I didn’t use it.

To make it easier to develop for IR, solder only one receiver and transmitter, and instead of the second channel, pass the RX-TX wire between the connectors. Be sure to connect the machine cases and the GND pins! Programmatically: In win98, when you turn on IRDA, it will be found and "IR communication devices" will be set, there will be LPT3 and COM4 emulation. Now you can start a direct connection via com4. These machines connect to the network. I also did this on win95, but there is more manual work.

Publication: cxem.net

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