[Ovmsdev] Add +12V ignition detection in OVMS HW v3.3? (was: VW e-Up: CANopen & CAN-ID scan results)
mark at webb-johnson.net
Mon Aug 3 14:31:23 HKT 2020
DB9 pin #1 is used for k-line. I guess it could be re-used for two purposes (on an expansion card).
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.
> On 3 Aug 2020, at 1:26 PM, Michael Balzer <dexter at expeedo.de> wrote:
> 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?
> 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:
>>> 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).
>>> 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".
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> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
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