Schematics > PC related > RJ45 Network card to IR communication
RJ45 Network card to IR communication
This system, composed of two opto-insulated circuits, allows the data
transmission per infra-red network device between two computers. For example,
someone can transfer his files starting from his desktop computer to his laptop
computer without using any cable. How? By using infra-red diodes. We have to
connect a circuit to the 10/100 Mbps network card of both computers by using a
very small network cable (can be smaller than 10 cm). One of the two extremities
of the cable must be removed to allow the wire connections. We must pay
attention when we do the connections.
The Tx+ output of any network card is connected to the input of the Rx+ of
the other with the cable. It's the same way for the Tx- and the Rx-. We have to
supply the circuits with two sources of voltage. I recommend to use a 9V battery
and the +5V output of the power supply for the desktop computer. The ground of
the power supply must be connected to the ground of the circuit. For the laptop
computer, I recommend to use a 9V battery and the 4.5V battery. All digital
components must be of the 74H series because these have short response times (less
than 2.5 ns). All the GND pins of the logic integrated circuits must be
connected to the ground of their circuit and their Vcc pin must be connected to
the +Vcc of their circuit.
Title: RJ45 Network card to IR communication
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 404
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