[Ovmsdev] OVMS v3.3 hardware

Mark Webb-Johnson mark at webb-johnson.net
Tue Aug 17 15:51:49 HKT 2021


We plan to use SIM7600G R2 chip. That is very similar to SIM5360 we currently use, but is multi-band and can cover both EU and US frequencies with one module. It is more expensive than the band-specific SIM7600A and SIM7600E, but certification costs for one single product (vs two) will be much cheaper, and logistics simpler for everyone.

I think the current modem board should already support SIM7600 modules. The sample I have is the same board design.

The issue is primarily firmware support. The for-v3.3 branch had so many problems with esp32 firmware lwip library messing up. But time is short, so I am thinking of just applying this as a small extension to the existing master firmware branch (adding a quick check for modem type, and then hard-coded support where necessary to cope with modem type differences).

Single Wire CAN is possible using that board design from Marko Juhanne, I think? If there is a requirement, we could make an optional expansion board for that (in a similar way to what we did for K-line).

Regards, Mark.

> On 17 Aug 2021, at 1:59 PM, Craig Leres <leres at xse.com> wrote:
> On 8/16/21 10:30 PM, Mark Webb-Johnson wrote:
>> Is there anything else required for this update?
> I'd like to volunteer for hardware testing of the SIM7600 capable version of the modem board. I have a US version of the SIM7600 module I can solder onto a bare board (and can easily deal with board-to-board connectors and support components).
> Will there be any effort to support single wire can? I know you can use a 2-wire can to communicate on a single wire bus but there is the question about being able to wake up the vehicle if the can chip is not the dedicated single wire version?
> (The beefed up micro usb connector sounds great)
> 		Craig

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