Ethernet logging hardware style.

Discussion in 'General Electronics Chat' started by mik3ca, Feb 29, 2008.

  1. mik3ca

    Thread Starter Active Member

    Feb 11, 2007
    189
    0
    I want to be able to use my ethernet card and detect signals from it using LED lights, and way later on in more sophisticated SBC circuits.

    I researched, and I noticed that four pins are marked TX+, TX-, RX+, and RX-.

    Does it work if I leave TX- floating, RX- floating, and connecting TX+ to my input source (which for now is a button tied to +5V), and connecting RX+ to the anode of an LED and a resistor in series, and grounding the other end of the resistor? or do I have to do an analog to digital conversion?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    "TX" means "transmit" and "RX" means "receive." The + and - indicate correct polarity. Your RX will not source or sink current. Your TX will provide only a few milliAmps peak - a couple dozen a the very most. Your card will be pulsing the output, not sending a steady "on."

    See also: http://en.wikipedia.org/wiki/Ethernet_physical_layer
     
  3. mik3ca

    Thread Starter Active Member

    Feb 11, 2007
    189
    0
    When you say that it doesn't produce a steady "ON", do you mean that I am to use the RX+ and RX- as if it were an AC signal?

    all I need is a simple circuit that can convert these signals to digital signals. USB has digital signals, but I want to use ethernet because it has far greater compatibility with more systems.

    Serial can provide digital output but at higher voltages.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    No. I mean there is a pulse train. That's why I said "pulsing." You did read the link I provided?

    They are already digital signals. You did read the link I provided?

    Here's more information: http://books.google.com/books?id=Oh...ig=BXlAf_TQM_Wey7gB7DqR0ippLfY&hl=en#PPA85,M1
     
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