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Thread: Anyone interested in serial controlled Relay/Input card?

  1. #61
    Raw Wave rando's Avatar
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    Quote Originally Posted by Ricky327
    However it can still be done because the PIC (some) have a built in CCP module. This can be setup to time a pulse interval and return the measured value in 10bit resolutions.

    From what you said we can still increase the sample rate alot higher than 200Hz but this involve changing the STATUS format from ASCII to binary.
    Well the first part is the type of solution I was thinking about. If you can get the PIC to report the pulse period (either last or average) that should give you good precision. The data rate back to the serial port would then only effect latency rather than latency and precision. In addition to period measurements, an aggregate count would be nice too. That way if you get an error on the serial stream or otherwise let the serial buffer overflow, you'd still have an accurate aggregate count of pulses. That count equates to total distance traveled. The period measurement gives you average speed over the pulse distance.

    If you assume we can get some sort of measurement of fuel flow and you'd be able to make a full fledged trip computer (avg and real-time miles per gallon, etc). Woohoo!

  2. #62
    Maximum Bitrate DjBac's Avatar
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    Quote Originally Posted by Ricky327
    I think with the handbrake is more practical, right??
    how can this be achieved? maybe with some relays?
    Do you have something in mind?



    Under the handbrake there should be a switch somewhere, use this to activate a relay/s which can then control the central lock. You may also want to include the state of the IGNITION.

    So...the central lock will open when the IGNITION is off and the handbrake is on. Then lock when IGNITION is on and handbrake is off. The clifford alarm does this but it doensnt take the state of the handbrake.

    I havent done it, just some thought in my head but I cant see it not working.


    A cool factor?
    I have a Viper alarm, but as you mentioned it doen't take the state of the handbrake?
    What kind of relays will I need??

  3. #63
    Maximum Bitrate DjBac's Avatar
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    Any Updates??

  4. #64
    Raw Wave
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    What kind of relays will I need??

    The standard car relay should do the job.


    Any Updates??

    Im still working on it. I think the hardware design is setted.

    Im still playing around with whats the best way to parse the command as it get received character by character by the relay board.

    I will give an update as soon as something is worth mentioning

  5. #65
    Maximum Bitrate DjBac's Avatar
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    OK!!!
    Thanx for the help with the relays!!!

  6. #66
    Maximum Bitrate DjBac's Avatar
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    Is there any update about the project???

  7. #67
    Newbie
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    ALREADY BEEN DONE AND WITH USB AND HIGHLY PROGRAMABLE WITH BASIC OR C++
    USING <A HREF="http://www.phidgetsusa.com/catalogue.asp">PHIDGETS</A>
    FOUND THANKS TO FRODO

  8. #68
    Constant Bitrate chuckctv's Avatar
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    use of a basic stamp is actually a great idea,you can have your computer software send a 2 digit code to the stamp everytime it sends a request, this way if the computer locks/malfunctions or even during startup/shutdown, no control over the relays will occur (unless you think theirs a chance when the computer malfunctions it will randomly send the 2 digit request code and then a code reconized to change the relay state; (chances are the same as winning lotto)). so although the stamp concept will increase the cost, it really is a great preventive measure....

    chuck

  9. #69
    Raw Wave
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    ALREADY BEEN DONE AND WITH USB AND HIGHLY PROGRAMABLE WITH BASIC OR C++


    Yes we know they exist

    The point of the project is purely for carPC environment.

    For examples :

    The inputs must take in the dirty 12V with selectable pull-ups/pull-downs. Depending on which part of the car electric its connected to...for example the IGNITION sense require input pull-down while door pins sense require pull-up. Most I/O board take in standard TTL...5V max with no definable pulls.

    The ADC must also take up to 12V or more for battery voltage measurements. The voltage range should be adjustable.

    The board should be able to drive a standard car relays. Most cant source/sink enough current for this type of relays...some dont even come with a driver.

    The board should operate at car battery voltage.

    I must say I like the USB on that one though, But its not really designed to be used for car PC unless modified or did I miss something?

  10. #70
    Maximum Bitrate DjBac's Avatar
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    Phidget's kits are very good!!!
    The voltmeters can handle up to 30V...
    And the input/output card upt to 30V I think!!!

    If I am wrong please correct me!!!!

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