Need some help chosing a "controller" or ADC

Discussion in 'The Projects Forum' started by bewhitney.geo@yahoo.com, Jan 23, 2010.

  1. bewhitney.geo@yahoo.com

    Thread Starter New Member

    Jan 23, 2010
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    I am trying to create a coaxial mapper.

    Here's what I'm thinking.

    1. I will terminate one end of the coax with one of eight resistor values.

    2. Use the device I create to take a reading. If reading is:

    - some voltage then turn on an LED labeled "voltage"
    - no continuity then turn on an LED labeled "open circuit"
    - continuity then turn on an LED labeled "short"
    - ohms then on a corresponding LED for that specific resistance. At minimum there will be 8 potential resistance values each with separate LED.

    3. (Probably optional) I'd also like to generate a tone over the line for up to 30 minutes by pressing a button.

    I've read through the site books vol 1 through vol 6 but I'm not sure how to take a resistance reading and correlate it to an output. I think I need an ADC?

    I've seen coax mappers that provide these functions but thought it would be a fun side project to make one. I can do these function with a multi-meter and terminating resister, but I'd liked to have a dedicated device "mapper" to do this.

    Thanks in advance for the help and reading my post.

    Bill
     
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