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Thread: Analog to Digital Conversion

  1. #1
    Low Bitrate
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    Analog to Digital Conversion

    Its been a long time since I have posted on here.. but my interest has recently been renewed.

    I'm building a truck from the ground up. And I'm adding some vehicle sensors (diff heat sensor, boost sensor, egt sensor, etc).

    Does anyone know of a manufacturer that makes a unit that will take the analog resistance and convert it to a digital format.. like a serial connection, or USB?

    The idea is to mount an lcd that will show me 8 or more sensor outputs...

    These will not be read through OBDII

    Thanks,
    -Chris

  2. #2
    Raw Wave Rob Withey's Avatar
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    Game port/joystick port?
    (with a multiplexer to get the 8 inputs).
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  3. #3
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    I have heard those are very inaccurate. I'm going to be dealing with the in-accuracy of the sensor, and vehicle wiring.. would rather not have something that needs to be recalibrated all the time.

    Good idea on the multiplexer.... I didn't think of that.

    -Chris

  4. #4
    Raw Wave rando's Avatar
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    National Instruments has a catalog full of instrumentation, sensor, sensor interfaces, and data collection devices and software. Their stuff is applicable for a small garage lab all the way up to a larg-scale fully automated factory or commercial manufacturing/test facility. If they don't make it, it probably doesn't exist.

  5. #5
    Constant Bitrate
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    Go for this one:

    PC Data Acquisition Unit (CPS93)
    http://www.amazonelectronics.com/ama...gue/c3-3-2.htm

    It has:
    Eight Digital Outputs. Open collector, 500mA, 33V max.
    Sixteen Digital Inputs. 20V max. Protection 1K in series, 5.1V zener to ground.
    Eleven Analog Inputs. 0-5V, 10 bit (5mV/step.)
    One Analog Output. 0.2.5V or 0-10V. 8 bit (20mV/step.)

    I have used amazon electronics, and their kits are great.

  6. #6
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    Rando,

    Thanks for the suggestion. Do you know where I might find their catalog.. online or otherwise?

    NewTechFool..... wonderful source.. Thats basically what I want to do... now I just have to figure out a way to avoid using a parrallel port (ick!) and get the volts from 12V to 5V (vehicle is 12 Volts which I would like to use to power these circuits). You have definatly got me going in the right direction though.

    I was thinking about this a little more... and ultimatly this is what I would like to do.. maybe someone has done it before?

    Replace some of the in-dash gauges with an LCD screen. Have this LCD screen report on any non-critical guages (Speedo, RPM, and Fuel will probably stay original.. because I REALLY need those). That leaves coolant temp, oil pressure, voltage, boost, exhaust gas temp, diff temp, wheel hub temp (4 hubs to monitor), transfer case temp, wheel air pressure (front and rear), and outside and inside atmospheric temp. So thats 15 inputs.. maybe 17 if I figure out a good way to control the adjustable shocks (those are actuated by air pressure.. so a sensor and couple relays might work well).

    Of course the must have backup camera, and gps is required.

    So.. I have seen some kick *** installs, and some amazing hardware developed by people on this board.. has anyone attempted this big of a project and actually made some progress? This is a multi-year project thats also dependant on actually getting the truck built as well.

    -Chris

  7. #7
    Variable Bitrate Banderon's Avatar
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    Any decent microcontroller has analog to digital conversion.

  8. #8
    Raw Wave
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  9. #9
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    Actually.. some one just posted this in another thread....

    http://www.phidgets.com

    Anyone know anything about these? Seem to be exactly what I need. The interface kit has 8 digital inputs (would read if a switch was on or off, right?), 8 digital outputs (power relays or led's, right?) and 8 analog inputs (read sensors).. and its usb, and has open source drivers.

    This seems to be the way to go.. unless anybody has better suggestions????

    -Chris

  10. #10
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    try to make one your self.
    a picaxe 18A would probly be good.
    www.picaxe.com there just a pic chip that is realy easy to program.

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