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    Mark already suggested you maybe can simply check the supply
    voltage.<br>
    <br>
    If the car system always turns on the DC/DC converter when awake /
    switched on / charging, and keeps the converter running exactly as
    long as it is switched on / charging, that's totally sufficient.<br>
    <br>
    The additional hardware solution may come to help if that is not the
    case, or the voltage doesn't change far enough to be sure about the
    source. For example if a car doesn't have a 12V battery and runs 12V
    equipment from a stabilized DC converter, or if the DC converter
    switches off when the 12V battery is full. Also be aware the 12V
    measurement may need user calibration.<br>
    <br>
    But as no other car developer joined this discussion it seems there
    isn't actually any need for a switched 12V detection.<br>
    <br>
    Regards,<br>
    Michael<br>
    <br>
    <br>
    <div class="moz-cite-prefix">Am 09.08.20 um 14:17 schrieb Soko:<br>
    </div>
    <blockquote type="cite"
      cite="mid:acbd1996-e08d-fb9d-488e-768a46c87b72@soko.cc">
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      <p>One more thought from a newbie to this issue which just came to
        my mind...</p>
      <p>Where is the added value of this expensive solution compared to
        just reading the 12V voltage. My eUp measures 12.6V when its
        shut down and 14.4V when its ready-to-drive/driving or charging.</p>
      <p>Soko<br>
      </p>
      <div class="moz-cite-prefix">On 03.08.2020 08:31, Mark
        Webb-Johnson wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:77DB02FE-A30C-4044-9F4F-4DA4B258D4C5@webb-johnson.net">
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        DB9 pin #1 is used for k-line. I guess it could be re-used for
        two purposes (on an expansion card).
        <div class=""><br class="">
        </div>
        <div class="">That said, it would make the cabling a little
          tricky. The DB9 12V is permanent. Having a 12v switched supply
          as well would presumably mean a loose wire coming out of the
          cable? Seems easier to just make a simple DA26 cable with just
          1 pin connected to a loose wire (or other wire outputs for
          relay, and general inputs, etc) - kind of why I was thinking
          of making this a more sophisticated board.</div>
        <div class=""><br class="">
        </div>
        <div class="">Regards, Mark.<br class="">
          <div><br class="">
            <blockquote type="cite" class="">
              <div class="">On 3 Aug 2020, at 1:26 PM, Michael Balzer
                <<a href="mailto:dexter@expeedo.de" class=""
                  moz-do-not-send="true">dexter@expeedo.de</a>>
                wrote:</div>
              <br class="Apple-interchange-newline">
              <div class="">
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                <div class=""> The re-certification requirement is a
                  PITA for hardware evolution. But I'm ok with extending
                  the K-line board, many OBD vehicles will still have
                  K-line devices (even the Twizy's UCH and airbag
                  modules are on K-line / KWP2000).<br class="">
                  <br class="">
                  Regarding the DB9, can't we use pin 1 (GEP_7) for
                  this?<br class="">
                  <br class="">
                  Regards,<br class="">
                  Michael<br class="">
                  <br class="">
                  <br class="">
                  <div class="moz-cite-prefix">Am 03.08.20 um 04:21
                    schrieb Mark Webb-Johnson:<br class="">
                  </div>
                  <blockquote type="cite"
                    cite="mid:71151A1C-7871-439D-9678-11FCC5AE7642@webb-johnson.net"
                    class="">
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                    It is hard to modify the main board, without voiding
                    the certifications we have (and going through the
                    expense of re-certifying).
                    <div class=""><br class="">
                    </div>
                    <div class="">Simplest would be to implement this on
                      an expansion board. Perhaps extend the K-line
                      board we have to do other functions (12v switched
                      status, relay control, etc)?</div>
                    <div class=""><br class="">
                    </div>
                    <div class="">The DB9 is full (all 9 pins assigned),
                      so this would have to be via DA26.</div>
                    <div class=""><br class="">
                    </div>
                    <div class="">We have been using the EGPIO lines for
                      system use, starting at #0 and working upwards:</div>
                    <div class=""><br class="">
                    </div>
                    <div class="">
                      <ul class="MailOutline">
                        <li class="">#0 MDM_EN (modem enable)</li>
                        <li class="">#1 SW_CTL (external 12v control)</li>
                        <li class="">#2 CAN1_EN (can#1 enable)</li>
                        <li class="">#3 MDM_DTR (modem DTR)</li>
                      </ul>
                    </div>
                    <div class=""><br class="">
                    </div>
                    <div class="">Then expansion boards should start at
                      #9 and work downwards:</div>
                    <div class=""><br class="">
                    </div>
                    <div class="">
                      <ul class="MailOutline">
                        <li class="">#9 K-line enable (on k-line
                          expansion board)</li>
                      </ul>
                    </div>
                    <div class=""><br class="">
                      <div class="">I guess we need just a simple
                        voltage divider, and pull down, to determine
                        on/off state of switched 12v?</div>
                      <div class=""><br class="">
                      </div>
                      <div class="">Regards, Mark.</div>
                      <div class=""><br class="">
                      </div>
                      <div class="">P.S. <span style="caret-color:
                          rgb(0, 0, 0);" class="">I have been hoping
                          that Espressif would release a successor to
                          the ESP32 with more RAM and GPIO pins, but it
                          looks like the prefer to go lower
                          performance/spec, rather than up.</span></div>
                      <div class=""><font class=""><span
                            style="caret-color: rgb(0, 0, 0);" class=""><br
                              class="">
                          </span></font>
                        <blockquote type="cite" class="">
                          <div class="">On 2 Aug 2020, at 5:47 PM,
                            Michael Balzer <<a
                              href="mailto:dexter@expeedo.de" class=""
                              moz-do-not-send="true">dexter@expeedo.de</a>>
                            wrote:</div>
                          <br class="Apple-interchange-newline">
                          <div class="">
                            <div class="">Mark,<br class="">
                              <br class="">
                              I remember the current Leaf also has the
                              issue of the OBD port being<br class="">
                              filtered by a gateway to only support
                              polling.<br class="">
                              <br class="">
                              I think we should generally add a +12V
                              ignition signal detection to the<br
                                class="">
                              next OVMS hardware revision, i.e. without
                              the need to add extra hardware.<br
                                class="">
                              <br class="">
                              There is no standard for the ignition /
                              switched +12V being available at<br
                                class="">
                              the OBD port, but I think most cars will
                              have that. If a car doesn't, it<br
                                class="">
                              should still be easy to get from around
                              the OBD port (e.g. fuses).<br class="">
                              <br class="">
                              Regards,<br class="">
                              Michael<br class="">
                              <br class="">
                              <br class="">
                              Am 02.08.20 um 11:03 schrieb Soko:<br
                                class="">
                              <blockquote type="cite" class="">Meaning:
                                We need a special VW-cable (like for the
                                NIssan or Kia Soul)<br class="">
                                with OBD Pin1 gets into a pin on the DB9
                                connector and into a<br class="">
                                Digital-In-Pin on the OVMS. A voltage
                                divider is needed as well as<br class="">
                                +12V on OBD-Pin1 signals "ignition on".<br
                                  class="">
                              </blockquote>
                              <br class="">
                              -- <br class="">
                              Michael Balzer * Helkenberger Weg 9 *
                              D-58256 Ennepetal<br class="">
                              Fon 02333 / 833 5735 * Handy 0176 / 206
                              989 26<br class="">
                              <br class="">
                              <br class="">
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                  <pre class="moz-signature" cols="72">-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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    <pre class="moz-signature" cols="72">-- 
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