<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Michael,<div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="content-isolator__container"><div class="protected-part"><div class="protected-content"><div class="">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. <a class="moz-txt-link-freetext" href="https://www.openvehicles.com/node/2855">https://www.openvehicles.com/node/2855</a>).<br class=""></div></div></div></div></blockquote><div class=""><br class=""></div>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.</div><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="content-isolator__container"><div class="protected-part"><div class="protected-content"><div class="">2. Any chance to fix the missing HW flow control on the modem UART connection?<br class=""></div></div></div></div></blockquote><div class=""><br class=""></div>I don’t think we have enough GPIOs. Perhaps later when/if ESP32 S3 becomes suitable?</div><div class=""><br class=""><blockquote type="cite" class=""><div class="content-isolator__container"><div class="protected-part"><div class="protected-content"><div class="">3. Will v3.3 automatically be built using the latest ESP32 WROVER, i.e. with the revision 3 ESP32 including the hardware SPIRAM fix?</div></div></div></div></blockquote></div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">Regards, Mark.<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 17 Aug 2021, at 3:31 PM, Michael Balzer <<a href="mailto:dexter@expeedo.de" class="">dexter@expeedo.de</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="content-isolator__container"><div class="protected-part"><div class="protected-title">Signed PGP part</div><div class="protected-content">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252" class="">
<div class="">
Mark,<br class="">
<br class="">
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.
<a class="moz-txt-link-freetext" href="https://www.openvehicles.com/node/2855">https://www.openvehicles.com/node/2855</a>).<br class="">
<br class="">
2. Any chance to fix the missing HW flow control on the modem UART
connection?<br class="">
<br class="">
3. Will v3.3 automatically be built using the latest ESP32 WROVER,
i.e. with the revision 3 ESP32 including the hardware SPIRAM fix?<br class="">
<br class="">
Regards,<br class="">
Michael<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">Am 17.08.21 um 07:30 schrieb Mark
Webb-Johnson:<br class="">
</div>
<blockquote type="cite" cite="mid:2500E21B-0833-402F-99D5-A88C6A52DCF9@webb-johnson.net" class="">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252" class="">
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.
<div class=""><br class="">
</div>
<div class="">
<div style="caret-color: rgb(0, 0, 0);" class="">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.</div>
</div>
<div class=""><br class="">
</div>
<div class="">So far, I have come up with this minimal list:</div>
<div class=""><br class="">
</div>
<div class="">
<ol class="MailOutline">
<li class="">Main board v3.3: Improve soldering of micro USB
port. Bigger solder pads, and more solder to secure it
better.<br class="">
<br class="">
</li>
<li class="">Modem board v1.3: Add support for SIM7600 module.<br class="">
<br class="">
</li>
<li class="">Modem board v1.3: Fix support for DTR sleep/awake
support.</li>
</ol>
</div>
<div class=""><br class="">
</div>
<div class="">Is there anything else required for this update?</div>
<div class=""><br class="">
</div>
<div class="">Regards, Mark.</div>
</blockquote>
<br class="">
<pre class="moz-signature" cols="72">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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