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Thread: Pioneer Wired remote control

  1. #61
    Fld
    Fld is offline
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    Hello. I release a music control via Wired remote control, but how can I emulating a pressing of "Phone" button at head of pioneer (deh-8500bt), I need it for canceling call when it going via bluetooth and enter in phone menu?

  2. #62
    Newbie MiSt's Avatar
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    @JVDE
    Thank you <<very much>> for the basic information and the schematic

    After successfully building a prototype, I want to suggest some improvements:
    • in case the ring is to be grounded and diodes are involved (different circuitry is recommended when using a uC, avoiding diodes), it is highly recommended to use schotty-diodes because of lower forward voltage
    • anyhow the resistor values need to be optimized (otherwise I did not obtain reliable operation) for actual headunits operating on 3.3V instead of 5V: I recommend using 10k instead of 11k, and 6.8k instead of 8.2k, together with schottky-diode for the "next/previous album" function
    • it seems the internal programming of the AD-converter operates on 7.5% steps of the reference voltage (3.3V/5V), starting with 17.5% for "On/Off/Source" ranging up to 85% for "band/escape". Assumed this is right, the resistor values given by JVDE can be optimized a little (see table below). Without grounding the ring, two more codes seem to be possible (at 25% with a resistor of 2.4k and at 77.5% with a resistor of 33k).


    The resistor values based on the 7.5% assumption and selected from E24 series, they rely on the schematic of the headunit providing a 10k pull up at the AD-input and a 1k series resistor to the input clamp:

    1.1k (17.5%) "On/Off/Source"
    2.4k (25.0%) ???
    3.9k (32.5%) "ATT"
    5.6k (40.0%) "Info display select"
    8.2k (47.5%) "next Track" or 6.8k + schottky + ring grounded "next album"
    11k (55.0%) "prev. Track" or 10k + schottky + ring grounded "prev. album"
    16k (62.5%) "volume up"
    22k (70.0%) "volume down"
    33k (77.5%) ???
    56k (85.0%) "band/escape"

  3. #63
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    Hello,

    I built a circuit prototype too including a potentiometer. I tested it on my Pioneer 4600BT using the average values provided by JVDE in his table (Thanks a lot to JVDE for the resistor ranges and the explanations ). That worked perfectly well for all the resistor values of the first circuit where the tip only is connected to the ground.
    For the second circuit (preset up and preset down functions), adding this time a connection between the ring and the ground via a "classical" diode, that has no effect on the autoradio. Note that I placed another diode in addition to the resistor between the tip and the ground, exactly as described on JVDE's schema.

    @MiSt: you are saying to replace the normal diodes by schotty diodes. Are you still referring to JVDE's schema? I.e simply 1 schotty diode between the ring and the ground and 1 schotty diode in addition to the resistor between the tip and the ground?
    Thanks in advance for your help.
    Last edited by gillou65; 02-12-2014 at 03:45 PM.

  4. #64
    Newbie MiSt's Avatar
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    Quote Originally Posted by gillou65 View Post
    @MiSt: you are saying to replace the normal diodes by schotty diodes. Are you still referring to JVDE's schema? I.e simply 1 schotty diode between the ring and the ground and 1 schotty diode in addition to the resistor between the tip and the ground?
    Thanks in advance for your help.
    I use exactly JVDE's schematic, yes, there is not much to improve.

    The diodes between ring and ground can be normal ones or a schottkies, this makes no difference, as the ring is a digital input to the headunit's micro and the level shift does not disturb recognition of "low".

    The diode(s) in series with the resistors I recommend to be schottkies, because the level shift of normal diodes is a bit high for modern headunits powered at 3,3V (this port is evaluated by a AD-converter). Even then alternative resistor values to JVDE's proved to be more reliable (I posted them above).

    BTW: I tried to find more functions on the remote interface but did not succeed. "Pause" would have been a real benefit ...

  5. #65
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    Wow!

    This thread is still allive!
    It's been a few years now and I frequently receive emails about this with questions.
    So I think my website needs some updating

    I will look thru the things you suggested here and make an update!
    Some say functions on the DVD series head units are a bit different...


    Anyway, thank you all for trying and experimenting!
    Your suggestions are very helpfull to me!

    JVDE

  6. #66
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    Thanks MiSt for your reply.
    I finally welded the final circuit including schottky diodes and following JVDE's schema. Since I was rewiring the remote control command on my Ford Focus 1.8 TDDI, I also added 2 micro push buttons for 2 additional functions. Everything works perfectly and I stayed with resistor values within the ranges provided by JVDE.

    Thanks again to you and to JVDE!

  7. #67
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    as promised the updated version

    http://www.jvde.net/node/7

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