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Thread: Re-engineered M2-atx firmware with fixes and added functionality

  1. #61
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    Quote Originally Posted by gommer View Post
    About the jumper options: one thing i can come up with, is making the jumper settings tri-state, then you can code up to 81 different options instead of only 16. they could be open, closed or -the new state- tied to ground or Vdd (the opposite of whatever the jumpers do standard). You probably know the schematics well enough to see if this is possible.
    an interesting idea.... but I dont think what you described are actually 3 different states to the PIC. The open state is the same as tied to Vdd and the closed state is ground... In other words, the pic sees either high or low on each pin and there are no other values. Does that make sense?

  2. #62
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    Can you make the voltage cutoff variable with respect to what the state of the M2 is in (eg. standby mode or powered on)? 12V would be a good cutoff for when the computer is in standby, but something like 11.5V would be reasonable for when the computer is powered on.

    Battery voltage isnt really a good indication of battery state of charge when the battery is being loaded since it varies with load.

  3. #63
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    Quote Originally Posted by nobb View Post
    Can you make the voltage cutoff variable with respect to what the state of the M2 is in (eg. standby mode or powered on)? 12V would be a good cutoff for when the computer is in standby, but something like 11.5V would be reasonable for when the computer is powered on.

    Battery voltage isnt really a good indication of battery state of charge when the battery is being loaded since it varies with load.
    Yes, that is possible... Can you give a little more detail behind your reasoning? It seems to me that the voltage cutoff can be either to prevent the battery from being damaged or to prevent the battery from getting low enough for the car not to start. One important thing to consider though is that the computer can potentially be in any state whether the car is running or not... meaning you could leave the key in the accessory position without cranking and those cases have to work as well, in my opinion.

    I do like the idea of controlling the threshold depending on the state of the psu as long as the strategy is clear....

  4. #64
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    Quote Originally Posted by bluTDI09 View Post
    an interesting idea.... but I dont think what you described are actually 3 different states to the PIC. The open state is the same as tied to Vdd and the closed state is ground... In other words, the pic sees either high or low on each pin and there are no other values. Does that make sense?
    Yes that makes sense. But if the input is fixed high or low and you toggle the pin as an output and then measure it's state as an input, you might be able to distinguish 3 states. The chalenge is not blowing the port i/o while doing this. It needs some thought.

  5. #65
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    Quote Originally Posted by gommer View Post
    Yes that makes sense. But if the input is fixed high or low and you toggle the pin as an output and then measure it's state as an input, you might be able to distinguish 3 states. The chalenge is not blowing the port i/o while doing this. It needs some thought.
    I don't think I am completely following what you are suggesting... in my understanding, a pin can have three states as an output: high, low, and high impedance (essentially disconnected)... If I am trying to read the pin as an input, how can it have anything but high and low?

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    short update:

    I have been in touch with mini-box and they have been very open to the idea of working with me so we are still trying to see where that will lead... I will say that they seem very cool and willing to consider improving their products based on real user feedback.

    I added some adjustable voltage thresholds to try and make the battery monitoring more effective. I think that combined with better planned timing options will be more robust for a larger number of people.

    I am about ready to send some chips to people for testing if anyone is willing to try it for me. If you want to, please send me a PM with some information about your carputer, your car, and if you have any particular cases where you will be looking for improvement. I will reply and we can work out how I will get the chips to you.

  7. #67
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  8. #68
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    I use my M2 strictly to power my monitor and USB hub...I jumped the power plug to trick it into thinking it's plugged into a mainboard...
    I THINK I need to use it's timed delay off function so as to keep my USB devices powered while the PC shuts down (or can I just kill the power with the IGN?).
    ANYWAY, the damn M2 draws way too much power when off, and the V threshold is WAY too low...
    Hopefully I can take part in your experiment!!!

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    Quote Originally Posted by WuNgUn View Post
    the damn M2 draws way too much power when off
    Agree with that. Mine draws ~60mA when the computer is "off" and about 90mA when I'm in standby. Not that big of a difference for me.
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  10. #70
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    Quote Originally Posted by gommer View Post
    Yes that makes sense. But if the input is fixed high or low and you toggle the pin as an output and then measure it's state as an input, you might be able to distinguish 3 states. The chalenge is not blowing the port i/o while doing this. It needs some thought.
    Sorry to bring up an old post but just read it. PICs have an internal weak pull-up which can be switched on programatically if the pin supports it, but the circuit has to be designed with an external weak pull-down of higher resistance. It's safe to switch on and off at any point and can be used fairly reliably at a high rate. But adding to an existing design would be a challenge since it may already be using that.

    An easier way would be to hook a momentary switch to one and count the clicks for different options. It takes a bit of work but I do that kind of stuff a lot.

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