[Ovmsdev] OVMS v3.3 hardware

[Mark Webb-Johnson]

Michael,

> 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 <https://www.openvehicles.com/node/2855>).

I have had just three reports of modem module not working at 12V, but working at 5V. On two, the issue was the power regulator chip blown on the modem board. I don’t think there is anything inherently wrong there - probably just a faulty component or power surge.


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

I don’t think we have enough GPIOs. Perhaps later when/if ESP32 S3 becomes suitable?

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


They normally build each batch with the latest. I haven’t checked for a while, so will check one from the last batch I received, and let you know. We can request this, but it will depend on stock.

Regards, Mark.

> On 17 Aug 2021, at 3:31 PM, Michael Balzer <dexter at expeedo.de> wrote:
> 
> Signed PGP part
> Mark,
> 
> 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 <https://www.openvehicles.com/node/2855>).
> 
> 2. Any chance to fix the missing HW flow control on the modem UART connection?
> 
> 3. Will v3.3 automatically be built using the latest ESP32 WROVER, i.e. with the revision 3 ESP32 including the hardware SPIRAM fix?
> 
> Regards,
> Michael
> 
> 
> 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:
>> 
>> Main board v3.3: Improve soldering of micro USB port. Bigger solder pads, and more solder to secure it better.
>> 
>> Modem board v1.3: Add support for SIM7600 module.
>> 
>> 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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