[Ovmsdev] Add +12V ignition detection in OVMS HW v3.3? (was: VW e-Up: CANopen & CAN-ID scan results)

[Michael Balzer]

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).

Regarding the DB9, can't we use pin 1 (GEP_7) for this?

Regards,
Michael


Am 03.08.20 um 04:21 schrieb Mark Webb-Johnson:
> It is hard to modify the main board, without voiding the
> certifications we have (and going through the expense of re-certifying).
>
> 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)?
>
> The DB9 is full (all 9 pins assigned), so this would have to be via DA26.
>
> We have been using the EGPIO lines for system use, starting at #0 and
> working upwards:
>
>   * #0 MDM_EN (modem enable)
>   * #1 SW_CTL (external 12v control)
>   * #2 CAN1_EN (can#1 enable)
>   * #3 MDM_DTR (modem DTR)
>
>
> Then expansion boards should start at #9 and work downwards:
>
>   * #9 K-line enable (on k-line expansion board)
>
>
> I guess we need just a simple voltage divider, and pull down, to
> determine on/off state of switched 12v?
>
> Regards, Mark.
>
> P.S. 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.
>
>> On 2 Aug 2020, at 5:47 PM, Michael Balzer <dexter at expeedo.de
>> <mailto:dexter at expeedo.de>> wrote:
>>
>> Mark,
>>
>> I remember the current Leaf also has the issue of the OBD port being
>> filtered by a gateway to only support polling.
>>
>> I think we should generally add a +12V ignition signal detection to the
>> next OVMS hardware revision, i.e. without the need to add extra hardware.
>>
>> There is no standard for the ignition / switched +12V being available at
>> the OBD port, but I think most cars will have that. If a car doesn't, it
>> should still be easy to get from around the OBD port (e.g. fuses).
>>
>> Regards,
>> Michael
>>
>>
>> Am 02.08.20 um 11:03 schrieb Soko:
>>> Meaning: We need a special VW-cable (like for the NIssan or Kia Soul)
>>> with OBD Pin1 gets into a pin on the DB9 connector and into a
>>> Digital-In-Pin on the OVMS. A voltage divider is needed as well as
>>> +12V on OBD-Pin1 signals "ignition on".
>>
>> -- 
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
>>
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>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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