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Thread: ITPS Programming

  1. #1
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    ITPS Programming

    Has anyone programmed their ITPS with longer timer delays? I just ordered an ITPS to mainly be used as a startup/shutdown controller. I like the startup sequence but I do not like that it turns off the computer a few seconds after ignition is removed. I would like to change the timer to last for ~6-8 minutes before shutting down so I don't have to restart the computer after short errands such as getting gas.

  2. #2
    Raw Wave god_of_cpu's Avatar
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    I hooked my power supply to only turn off when my car was armed with my keyfob. If you really want just to time it off, build yourself a timer circuit with a 555 Timer chip and hook it up to the ignition line. Just google for how how build such a circuit or im sure there probably a couple mentions of it on here.
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  3. #3
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    Quote Originally Posted by god_of_cpu
    I hooked my power supply to only turn off when my car was armed with my keyfob. If you really want just to time it off, build yourself a timer circuit with a 555 Timer chip and hook it up to the ignition line. Just google for how how build such a circuit or im sure there probably a couple mentions of it on here.
    I do like the ITPS for the startup sequence which requires it be connected to the power button...I don't know how to modify the shutdown sequence without reprogramming since it activates the same power button used for the startup sequence.

  4. #4
    FLAC
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    Before you try to modify the code you should try your ITPS with your engine off to see if you CarPC will continue to run. Remember that the ITPS drops 1.3V so that, when you engine is not running and you are relying on just your battery for power your CarPC will only see 10.7V. Most PSU's won't tolerate this low voltage and cause the CarPC to crash.

    Edit: ..oops, just noticed you use a pre-regulator to take into account the voltage drop.
    MikeH

  5. #5
    Raw Wave
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    I thought a new firmware has been released and does longer delays?

    From what I remembered someone (many months ago, cant remember now) had a chat with the ITPS programmer and he was sent the new firmware.

    I don't know how to modify the shutdown sequence without reprogramming since it activates the same power button used for the startup sequence.

    Yes it should be possible to delay the shutdown by connecting a timer triggered by the ACC line. A +12V on the ACC line make the output of the timer goes +12V immediately and a 0V start the timer then its output goes low after some minutes.

    You can try this with a diode, resistor and capacitor. But this depend if the ITPS ACC input is fussy or not with a slow decaying voltage fed at it.


    ................DIODE...............+
    Car ACC ----|>|------|-----|-----> ITPS ACC
    .............................RES...CAP
    ...............................|.......|
    Car 0V----------------------------> ITPS 0V


    The diode only take in the +12V from the car ACC, this in turn put a +V into the ITPS, charging the capacitor immediately and turning the ITPS on. When the ACC is off, the remaining charge of the capacitor is discharge through the resistor and some in the ITPS circuitry. The capacitor will continue to discharge and when the "low" threshold of the ITPS input is reached then this is when the ITPS thinks that the ACC line fed to it has gone off.

    The value of the resistor and the capacitor determine the time delay.

    Have a try if you want but of course as been said a proper timer should do the job properly.

    Good luck

  6. #6
    Raw Wave
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    or infact a much proper way of doing it is to reprogram the ITPS

  7. #7
    Maximum Bitrate Bravellir's Avatar
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    Quote Originally Posted by EBJUSTIN
    Has anyone programmed their ITPS with longer timer delays? I just ordered an ITPS to mainly be used as a startup/shutdown controller. I like the startup sequence but I do not like that it turns off the computer a few seconds after ignition is removed. I would like to change the timer to last for ~6-8 minutes before shutting down so I don't have to restart the computer after short errands such as getting gas.

    Most of the time, I guess, you will want to shut down immediately, and only occasionally you want to leave it running.

    To me the solution was to install a tree pole switch on the ITPS ACC line.
    One connected to unswitched 12v, other to switched 12v and the last not connected.
    If the switch is to the Live 12v Source ( the one you want when getting gas ) the carputer stays on no matter how the ignition is.
    If the switch is to the pole not connected, the carputer is always off.
    If the switch is to the acc line, the carputer will startup/shutdow normally.

    Like this I just have to switch to the "Always on" position before I remove ignition.
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  8. #8
    Variable Bitrate brooksware2000's Avatar
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    Quote Originally Posted by EBJUSTIN
    Has anyone programmed their ITPS with longer timer delays? I just ordered an ITPS to mainly be used as a startup/shutdown controller. I like the startup sequence but I do not like that it turns off the computer a few seconds after ignition is removed. I would like to change the timer to last for ~6-8 minutes before shutting down so I don't have to restart the computer after short errands such as getting gas.
    I have successfully reprogrammed my ITPS chip for longer delays. In fact, I totally reprogrammed the chip for some extra functions that I wanted. To do it, naturally you need a PIC programmer. I have one from BasicMicro that came with my MBasic compiler. The documentation on mini-box.com speaks of reprogramming the chip for longer delays (I think it is mentioned in the provided assembler code). Rick327 provided some code for this guy months ago that wanted to re-program his chip to turn on with a push button instead of the ignition and have longer delays. If Ricky327 doesn't mind I will post that code to this thread as I have a copy of it.
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  9. #9
    Raw Wave
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    If Ricky327 doesn't mind I will post that code to this thread as I have a copy of it.

    Go for it

    I couldnt even remember if I did put the code up or not

    The mod I did was just a push on-push off job...which probably not alot of poeple would want.

    I guess the one you did is gonna be more in demand as most people do cry for this longer delay.

    Nice to see another PIC guy in here.

  10. #10
    Variable Bitrate brooksware2000's Avatar
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    Here is the code for the push on push off that Ricky327 did. I'll post my code later this afternoon as soon as I do a little writeup on it.
    Attached Files Attached Files
    Check out my hopefully useful site...

    www.hobbybotics.com

    It's still under design but it is functional

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