[Ovmsdev] Relay through diag port.

[Mark Webb-Johnson]

Aha - that now makes sense.

Is the socket there easy to hack? Presumably you'd just need to relay the live wire. You could even wire it normally-closed so OVMS has to be present to stop it from charging.

I'll have a look at the wiring diagram. It should be fairly easy to pick say 4 digital inputs, 4 digital outputs and 2 ADs and support them directly in utils.h/utils.c and via net_msg commands.

Regards, Mark.

On 14 Apr, 2013, at 11:08 PM, Nikki Gordon-Bloomfield wrote:

> Hi Mark, 
> 
> I'm thinking car side rather than socket side. So you only plug one thing in.  ;)
> 
> Nikki
> 
> 
> 
> Sent from my iPhone
> 
> On 14 Apr 2013, at 15:37, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> 
>> Nikki,
>> 
>> Technically, it seems fine.
>> 
>> When you get home with such an arrangement, you would need to plug in two cables? One for the charger and the other for OVMS (connecting the relay to the charger)? Seems  bit onerous.
>> 
>> Is there any way of making this wireless? The problem is keeping it simple - we just want digital on/off signals not serial control (otherwise X10 modules or something like that would be easy). I got given an electric imp development kit - which is about US$40 (for the board and the imp) and gives wifi. The digital I/O of that could go to the OVMS module and allow on/off control of Internet services. Couple that with an Internet-controlled power socket (belkin?). Or, the existing OVMS 3G modem and server connection could be used to control.
>> 
>> Or are you thinking of wiring up the relay to the car side power inlet?
>> 
>> Regards, Mark.
>> 
>> On 14 Apr, 2013, at 7:01 PM, Nikki Gordon-Bloomfield <nikki at littlecollie.com> wrote:
>> 
>>> I've been thinking about this some more, and I think I've come up with a plan. 
>>> 
>>> If I could pull the IO out there and connect it to a relay driver chip, I think it could be possible to give Twizy owners the same remote on/off charge capabilities as the Tesla. 
>>> 
>>> My thoughts: 
>>> 
>>> 1) use output one from OVMS to drive a relay which is NO. When the IO output from OVMS goes high, we use that to close the relay, and let power flow, turning on the charger. When it goes low, the relay opens, and the charger turns off. 
>>> 
>>> 2) use a second IO on the OVMS to sense when a switch is pressed on the dash. This allows us to start/stop charging from the vehicle using a simple push-to-make switch. 
>>> 
>>> 3) using a home instance of perl and OVMS client software, write a cron job which turns on the car's charging on/off at a given time every day, or have perl listen for SOC and shut off charging when we reach 80% SOC. 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> My goal? To give Twizy owners the ability to use time-of-use metering to get cheaper charging of the Twizy at night-time. And also to allow users to set 80% SOC rather than 100% SOC. It would require folks to run a perl script all the time on their home computers though. 
>>> 
>>> Nikki. 
>>> 
>>> 
>>> 
>>> On 2 Apr 2013, at 14:05, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
>>> 
>>>> Tricky. It is just a tap into the modem comms.
>>>> 
>>>> But, there is an expansion connector on the board itself.
>>>> 
>>>> The part labelled "HEADER 9X2" is a standard layout for expansion plugs, or holes are there to directly solder to the board. The I/O is 5v digital on those pins, and there are quite a few spare I/O pins that you can use.
>>>> 
>>>> There is also GND, +12V and +5V if you need power.
>>>> 
>>>> If you have a use for this, it would be quite simple to control some of these pins on/off on command (similar to the way home link works).
>>>> 
>>>> Regards, Mark.
>>>> 
>>>> <PastedGraphic-1.pdf>
>>>> 
>>>> <20120814-boarddesign.pdf>
>>>> 
>>>> On 2 Apr, 2013, at 8:56 PM, Nikki Gordon-Bloomfield <nikki at littlecollie.com> wrote:
>>>> 
>>>>> Guys,
>>>>> 
>>>>> Is there any scope for enabling IO from the diagnostic port to operate an relay, either directly or through some opto-isolators? 
>>>>> 
>>>>> Nikki. 
>>>>> _______________________________________________
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>>>>> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev
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