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:


Then expansion boards should start at #9 and work downwards:


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@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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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26