[Ovmsdev] OVMS v3.3 hardware

Michael Balzer dexter at expeedo.de
Tue Aug 17 15:31:33 HKT 2021


1. I had the impression we've had more than expected "modem not/stopped 
working" issues. Is that impression wrong, or didn't those cases share a 
hardware cause? I was wondering if that could be related to a voltage 
regulator issue (e.g. https://www.openvehicles.com/node/2855).

2. Any chance to fix the missing HW flow control on the modem UART 

3. Will v3.3 automatically be built using the latest ESP32 WROVER, i.e. 
with the revision 3 ESP32 including the hardware SPIRAM fix?


Am 17.08.21 um 07:30 schrieb Mark Webb-Johnson:
> For the 4G modem options we need to go through FCC, CE, and ROHS 
> certification. Minimising/eliminating the changes to the main board 
> simplifies this (and brings down the exorbitant costs) but if there is 
> anything urgent / necessary, now is the time to do it.
> The goal here is to maintain 100% compatibility with existing OVMS 
> main boards, to keep this is a simple and relatively cheap upgrade of 
> the modem board.
> So far, I have come up with this minimal list:
>  1. Main board v3.3: Improve soldering of micro USB port. Bigger
>     solder pads, and more solder to secure it better.
>  2. Modem board v1.3: Add support for SIM7600 module.
>  3. Modem board v1.3: Fix support for DTR sleep/awake support.
> Is there anything else required for this update?
> Regards, Mark.

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

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