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Thread: Simply serial input circuit

  1. #71
    Raw Wave rando's Avatar
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    @M^ck^y: No, I think that is the way it's currently implemented in FP1.09. Whenever the signal is received, vis/video are disabled and if the current display mode is vis or video then the display is mode is changed to media info mode. Once the signal is remvoed, vis/video is enabled but the mode is not changed.

  2. #72
    Variable Bitrate M^ck^y's Avatar
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    Thanks rando. I have tested the circuit and it works. However I'll wait untill more than one relay can be connected to the same circuit I might be too greedy but i don't find it worth for now.

  3. #73
    Raw Wave rando's Avatar
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    Quote Originally Posted by M^ck^y
    Thanks rando. I have tested the circuit and it works. However I'll wait untill more than one relay can be connected to the same circuit I might be too greedy but i don't find it worth for now.
    You mean you want multiple triggers? If so, the original circuit can accomodate that. Just add more relays hooked the same way as the first. Alternatively, you can multiplex the input of the original relay with diodes, transistors, etc -- whatever is appropriate for your setup.

  4. #74
    Variable Bitrate M^ck^y's Avatar
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    Rando that's great, I will look into it, but I don't know how. Can you plz draw a circuit whenever you have a little spare time. How many relays could be connected? I will try to find a way to have these relays detected by girder.

  5. #75
    Raw Wave
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    Quote Originally Posted by M^ck^y
    Rando that's great, I will look into it, but I don't know how. Can you plz draw a circuit whenever you have a little spare time. How many relays could be connected? I will try to find a way to have these relays detected by girder.
    You can put as much relay as you want but where and how would you use that set up?

    Lets say...10 relays from 10 different sources to trigger the same input is a very inefficient approach. You still need to make sure the comport dont clash with the relays not agreeing with each other...the solution dont make sense. Dunno how rando would draw this one up...maybe its possible...who knows

    But if you really need to trigger from 10 sources triggering the same input then YEAH just use a diode for each sources such as the 1N4000 series to isolate them from each other. Bear in mind that once one of the source had pulled the input to a +12V then the rest are ignored.

    I get an impression you want to trigger 10 different inputs from 10 different sources...if this is the case then that circuit aint gonna do it.

  6. #76
    Raw Wave rando's Avatar
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    @M^ck^y: This ciruit and FP are designed to support reading from a single COM pin. If you're looking to add multiple triggeres, you can do it with relays or diodes as I mentioned. I'm not going to post an updated schematic because the difference is too simple. Just wire up another relay to the same exact serial port pins in the same exact was as the first. The relay coil pins then become your second trigger. You can do this as many times as you need -- there's no limit beyond space and practicality. For the diode approach, you just need the single relay. You would multiplex the existing trigger line with diodes. Add 1 diode for each trigger (3 triggers = 3 diodes).

    Either way, this works just like Ricky said above. If any of your sources is on, the circuit is on (i.e. 'wired OR' behavior).

    If you're looking to do something else not supported by FP, then you need to start another thread.


    UPDATE: I just reread this and think the the multiple relay approach to multiple triggers won't work as i described it above. No matter, it's easier and cheaper to use diodes to multiplex the trigger with a single relay. Sorry for the confusion.

  7. #77
    Variable Bitrate Supermike's Avatar
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    Has anybody put one of these in and taken pics.

    Also, the opto-isolation idea mentioned earlier in this thread seems like a great idea, has anybody tried it?

    Finally, Frodo, are you gonne list these for sale anytime soon?
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  8. #78
    Raw Wave rando's Avatar
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    Sure, I've got mine in place and working. No pics though but imagine a 9 pin serial connector with a relay and diode soldered to it, all wrapped up in loom. That's exactly what the picture would look like.

    Perhaps Frodo's production version will be molded into the 9-pin connector shroud -- I have no idea.

  9. #79
    MySQL Error MatrixPC's Avatar
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    We should move this thread to the Hardware dev. subforum.
    This thing work fine for me. Now I try to ultilize the serial port to take in 3 input instead of just the hand brake. Reverse cam is one of them.
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  10. #80
    Variable Bitrate Supermike's Avatar
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    Thanks for the description Rando, and for the initial design idea. I was thinking of using a plastic project box, but puting it inline with the cable seems like it would be more compact.

    MatrixPC, can you post a schematic for your design when you get it finished? BTW, what is the 3rd input for (lockout, reverse cam, and ???)?

    Thanks
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