[Ovmsdev] OVMS v3.3 hardware

Mark Webb-Johnson mark at webb-johnson.net
Tue Sep 14 15:01:17 HKT 2021

Progress update…

I’ve completed the basic support for plugin modem drivers and SIM7600  in the for-v3.3 branch, and it seems stable on my bench and car (although I never saw many problems before with this). I would still appreciate it if others could test and feedback any crashes they get. You can get the update OTA from api.openvehicles.com <http://api.openvehicles.com/> by setting tag ‘pre’.

We’ve also completed the testing of the hardware. The DTR low-power control option seems to be working well (but will require firmware support later). The ‘final’ list of hardware changes are as follows:

Main Board:
Silkscreen label “OVMS V3.3” (with date of production batch)
Change to improved internal antenna cables for GSM and GPS
Strengthen soldering on micro USB connector
Strengthen soldering on power supply capacitors
WROVER module to use revision 3 ESP32
Add 0.1uF capacitor to 12v measuring voltage divider ADC input (https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html#minimizing-noise <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html#minimizing-noise>)

Modem Board:
Silkscreen label “OVMS MDM V3.3” (with date of production batch)
Add support for SIM7600 module
Fixed DTR support
Improve/check voltage regulator and capacitor protection
Reduce brightness of blue LED by at least 50%
Airplane mode pin fix (working ok now, but safer to pull up/down properly)
Confirm PWRKEY circuit tuning

Product label - just one label with CE and FCC certification for global use

We are now producing a few final samples of the above to go to the certification labs for CE, FCC, and ROHS testing later this month. We hope that certification will take 6 to 8 weeks and be complete around the end of November. Once that is done, we should be able to go to full production in time for Christmas. Pricing will be confirmed early December, but likely more expensive than v3.2 due to the extra cost for SIM7600G and certification fees.

Stock of existing SIM5360 modules are as follows:

EU kits; in stock at open energy monitor (but selling out fast and likely to be unavailable soon).
US kits; in stock at Medlock, Fasttech, and Open Vehicles (HK).

Regards, Mark

> On 30 Aug 2021, at 2:03 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> I now have two prototypes of the 4G modem using SIM7600G R2 chip for OVMS v3.
> One is for my own work, but willing to send the other free to a volunteer developer willing to spend time working with me to develop and test this new option. Obviously looking for someone who has spent some time on the OVMS code base, with a good history of contributions to the project and a willingness to work on improving the cellular modem driver.
> Any volunteers? Please eMail me directly (mark at openvehicles.com <mailto:mark at openvehicles.com>).
> Regards, Mark.
> <IMG_9926.png>
>> On 17 Aug 2021, at 1:30 PM, Mark Webb-Johnson <mark at webb-johnson.net <mailto:mark at webb-johnson.net>> wrote:
>> 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.
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