[Ovmsdev] v2 Basic Hardware

[Mark Webb-Johnson]

William,

The SIM908 we are using for the basic v2 module is definitely the SMT variant. The China guys were adamant that it is much better - more solid and cheaper. They said the other one was mostly for prototyping/development. I asked, but no footprint - I don't think they use Eagle much. I reckon they use ripped-off versions of the professional layout software - who knows, they might even be paying for it ;-)

Do you know how the beaglebone handles the software side of things? It seems to be running a 'sheltered' linux. Particularly for the wifi, the requirement I've heard is 2-fold - 1) being able to act as a wifi client to the home wifi network, to report status when GSM is no-signal in the garage, 2) being able to act as a wifi hotspot in the car. We really don't want to be coding all that, and just want to use the standard Linux packages. Personally, I'm interested in (1) more than (2), because I need to be able to tap the can bus while the car is in the garage, at high speed, and conveniently. Much more comfortable to reverse engineer while sitting in a comfy armchair than in a hot cramped car in a hot cramped garage ;-)

I don't think the DIAG is that important. Most developers just use a RS232-usb dongle, and only developers are playing with that port really.

Regards, Mark.

On 4 Jul, 2012, at 4:47 PM, William Petefish wrote:

> Looks good Mark. Love the tube style case. 
> 
> 
> My complex version is still a while out. (isn't alpha fun?) I am currently working on the GSM side of things. I am trying to find a footprint for Eagle as to the SIM908 module before I try to make one. If anyone knows of such a footprint send me a message.
> 
> Specs on the current cape include:
> 2x CAN
> 1x ISO9141 (OBD K & L lines)
> 1x J1850
> 1x connector for GLCD w/ touch interface (4.3" or 3.2") 
> 
> The BeagleBone has a USB host port that a mini WiFi adaptor would be able to be fitted to. 
> 
> I was also thinking instead of using a DB9 for the Diag on the modem I'd use an FTDI cable. (or breakout from Sparkfun.)
> 
> Thoughts/Concerns?
> 
> William
> 
> On Mon, Jul 2, 2012 at 7:43 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> 
> I thought you might be interested in seeing some early pictures of the prototypes for the vs basic hardware we've been working on with the China team.
> 
> Some notes:
> 
> The design uses a metal rectangular "tube" style case, customised for us and cut to the width of our board. The case ends up about 7cm x 6cm. Labelled end-plates will go on, with cut-outs for the various connectors. The original design called for this to be black in colour, and we're still deciding on that (as the silver doesn't look bad and will be mostly covered with a black sticker anyway). Opening it involves removing the 4 screws on one side and sliding it out.
> 
> On one side we have the CAN (and power) DB9, GSM and GPS antennas. On the other side we have the DIAG DB9 and expansion bus connectors.
> 
> Holes for the LEDs are on the bottom of the case, and the LEDs themselves are on the bottom of the board, so that they are as close to the holes as possible.
> 
> There are zero internal cables, and only one circuit board containing the PIC controller and SIM908 modem - connection to the car is via the main CAN DB9, using custom cables. We have tried to follow ODBII standard pinouts  for that connector.
> 
> For Tesla Roadster, we can use a custom 4 wire connector (Tesla DIAG port connector on one end, DB9 female on the other). For ODBII cars, a similar arrangement can be made.
> 
> The SIM908 modem chip supports GPS for those cars that don't have it.
> 
> Still early days, but the design looks workable and should be much easier to assemble and QC than the v1 modules. Rock solid and (probably) bullet proof. It should also have good support for cars other than the Tesla Roadster.
> 
> Regards, Mark.
> 
> P.S. I'm also working on a more advanced hardware solution, as a personal project, that may end up being offered. Just experimenting at the moment. William is also working on some solutions for this based on *bone hardware and shields. These are much longer term, and we'll send out more details when we have some progress.
> 
> <截图1.png>
> 
> <截图3.png>
> 
> <截图2.png>
> 
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