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Mark,<br>
<br>
for the Twizy and maybe other cars, a wakeup from activity on the
CAN bus could also be an option. I remember reading about that in
the SIM908 manual. The OVMS could generally sleep while the Twizy is
off, maybe with an optional timed wakeup every 10-15 minutes for 1-2
minutes to detect GPS position changes.<br>
<br>
Btw, the SIM908 hardware design contains detailed info on the sleep
modes and power usages:<br>
<a class="moz-txt-link-freetext" href="http://www.mt-system.ru/sites/default/files/sim908-c_hardware_design_v1.03.pdf">http://www.mt-system.ru/sites/default/files/sim908-c_hardware_design_v1.03.pdf</a><br>
<br>
Thanks for bringing the 12V monitoring to my attention.<br>
<br>
I'll now first add an SMS alert on the 12V power line getting too
low, that's easy to implement and will remind users to charge.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 19.01.2013 10:47, schrieb Mark
Webb-Johnson:<br>
</div>
<blockquote
cite="mid:946F2EB5-33B6-46BE-BF8B-B9E8ED9B8419@webb-johnson.net"
type="cite">
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Here are the power usage figures from my bench, using v1 hardware:
<div><br>
</div>
<div>
<ul class="MailOutline">
<li>PIC (normal mode) on, modem powered down (by power toggle
switch): 35mA - 42mA</li>
<li>PIC (normal mode) on, modem on, gps off: 75mA</li>
<li>PIC (normal mode) on, modem on,gps on: 120mA</li>
<li>Very short-lived bursts to 160mA at times, presumably
while transmitting on GSM</li>
</ul>
</div>
<div><br>
</div>
<div>Playing with AT+CSCLK=2, the modem seems to drop to almost no
power usage (perhaps 45mA), with a CR on the async port waking
it up.</div>
<div><br>
</div>
<div>Looking at the PIC18F2685 data sheet, it seems that with an
external 20MHz oscillator, the normal power consumption is
around 30mA to 40mA. Switching to an internal 4MHz oscillator
reduces that to 5.3mA, and internal 1MHz oscillator to 3mA.
Sleep mode is 2µA.</div>
<div><br>
</div>
<div>I'll play around with it. So far, it seems it is quite easy
to go into low-power sleep mode. It is getting back out that is
the tricky bit.</div>
<div><br>
</div>
<div>Regards, Mark.</div>
<div><br>
<div>
<div>On 19 Jan, 2013, at 8:50 AM, Mark Webb-Johnson <<a
moz-do-not-send="true" href="mailto:mark@webb-johnson.net">mark@webb-johnson.net</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
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charset=ISO-8859-1">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">Michael,
<div><br>
</div>
<div>Urgh. Glad that you managed to recover it.</div>
<div><br>
</div>
<div>The TMC forums have a few theads at the moment of
Model S cars with 12V battery issues, and the Tesla
Roadster's little 12V battery seems to need replacing
every 13 to 25 months.</div>
<div><br>
</div>
<div>For Roadsters, OVMS is not run off that little 12V
battery, so we haven't seen this issue.</div>
<div><br>
</div>
<div>The good news is that we did anticipate this sort of
thing (except were expecting to see it more on ICE cars
with OBDII monitoring). We added 12V power line
monitoring, through an ADC, into the v2 hardware.
Looking at your logs for the past few days is
interesting (I don't think there is anything private in
their apart from the vehicleid and odometer, which I
have obscured, so hope you don't mind me posting here).
The 12v line reading is the second to last column:</div>
<div><br>
</div>
<div>
<blockquote style="margin: 0 0 0 40px; border: none;
padding: 0px;"><font face="Andale Mono" size="2">2013-01-14
06:39:53.930886 -0500 info main: #34 C XXXXXXX rx
msg D
128,0,0,13,17,4,0,YYYY9,28,0,-127,0,120,-1,15.0,0<br>
2013-01-14 06:59:54.871517 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
2013-01-14 07:05:26.666203 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
2013-01-14 07:05:46.498420 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
2013-01-14 07:06:04.864927 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.7,0<br>
2013-01-14 07:30:07.228738 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.6,0<br>
2013-01-14 08:29:57.461316 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.5,0<br>
2013-01-14 09:29:48.441380 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.4,0<br>
2013-01-14 11:29:30.755176 -0500 info main: #34 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.3,0<br>
2013-01-14 15:05:36.688666 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
2013-01-14 16:05:35.111552 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
2013-01-14 16:36:35.755630 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
2013-01-14 18:38:18.404933 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.2,0<br>
2013-01-14 21:04:47.187479 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.1,0<br>
2013-01-15 02:04:22.801440 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,12.0,0<br>
2013-01-15 09:03:13.233483 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.9,0<br>
2013-01-15 11:02:54.400624 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
2013-01-15 12:02:44.724576 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.9,0<br>
2013-01-15 13:02:34.285593 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.8,0<br>
2013-01-15 16:02:09.372087 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
2013-01-15 17:02:00.235001 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.8,0<br>
2013-01-15 19:01:41.695938 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.7,0<br>
2013-01-16 02:00:40.126355 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.6,0<br>
2013-01-16 06:00:03.073862 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.5,0<br>
2013-01-16 11:59:01.907094 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.4,0<br>
2013-01-16 15:58:22.520731 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:22:48.691426 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:30:10.701329 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:30:21.837740 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
2013-01-16 17:36:37.811552 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:46:01.164994 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:48:35.257576 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 17:56:49.565932 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:01:15.186127 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:02:46.866156 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:02:54.217581 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:10:29.930408 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:10:38.723483 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
2013-01-16 18:11:12.459758 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
2013-01-16 18:18:31.863177 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:19:03.123286 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:43:55.355803 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.3,0<br>
2013-01-16 18:58:43.567326 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.2,0<br>
2013-01-16 22:58:15.314101 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.1,0<br>
2013-01-17 01:57:50.181011 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,11.0,0<br>
2013-01-17 02:57:40.587918 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.9,0<br>
2013-01-17 03:57:30.418056 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.8,0<br>
2013-01-17 04:57:19.241415 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.6,0<br>
2013-01-17 05:57:10.622186 -0500 info main: #54 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.3,0<br>
2013-01-17 06:32:32.593533 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,10.0,0<br>
2013-01-17 07:32:23.932656 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,9.4,0<br>
2013-01-17 08:32:13.374380 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,7.9,0<br>
2013-01-17 09:32:03.204557 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,7.2,0<br>
2013-01-17 10:31:52.551362 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,6.5,0<br>
2013-01-17 11:31:41.821330 -0500 info main: #55 C
XXXXXXX rx msg D
0,0,0,14,15,4,0,ZZZZ0,0,0,-127,0,0,-1,6.7,0<br>
2013-01-17 12:58:48.540906 -0500 info main: #60 C
XXXXXXX rx msg D
128,0,0,13,1,2,0,ZZZZ8,0,0,-127,0,120,-1,15.1,0</font></blockquote>
</div>
<div><br>
</div>
<div>It shows 15v at the start (I guess when the car is on
and charging it), then 12.7v at 2013-01-14 06am EST,
then falls gradually to 11.0v at 2013-01-17 01am EST. At
that point it seems to fall faster, down to the last
report (just 10 hours later) 6.7v at 2013-01-17 11am
EST.</div>
<div><br>
</div>
<div>My original thought to handle this was to have two
thresholds.</div>
<div><br>
</div>
<div>At the first threshold, the PIC would turn off the
modem and re-awake only once every 12 hours, for 2
minutes, before going back to sleep.</div>
<div><br>
</div>
<div>At the second threshold, the PIC would turn off the
modem, and go to a deep sleep itself. In this mode, once
power was restored it would reset itself.</div>
<div><br>
</div>
<div>Exit from either mode would be the 12v power line
going back above the first threshold plus some safety
margin.</div>
<div><br>
</div>
<div>This weekend, I'll get some exact power measurements
from the v2 hardware module, so we know what we are
dealing with:</div>
<div><br>
</div>
<div>
<ul class="MailOutline">
<li>Just the PIC (modem powered down)</li>
<li>PIC + MODEM</li>
<li>PIC + MODEM + GPS</li>
</ul>
</div>
<div><br>
</div>
<div>Last time I tested this, on v1 hardware without GPS,
these were the figures for PIC + MODEM:</div>
<div><br>
</div>
<div>
<ul class="MailOutline">
<li>Idle: 40mA @12V</li>
<li>Cellular Network Registration: 100mA @12V</li>
<li>Network activity: 80mA @12V</li>
</ul>
</div>
<div><br>
</div>
<div>Regards, Mark.</div>
<div><br>
<div>
<div>On 18 Jan, 2013, at 10:47 PM, Michael Balzer <<a
moz-do-not-send="true"
href="mailto:dexter@expeedo.de">dexter@expeedo.de</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">Mark, List,<br>
<br>
yesterday my Twizy was temporarily dead... because
of the OVMS power usage.<br>
<br>
I had not driven for 5 days. The Twizy has a very
small 12V battery with only 14 Ah capacity, and it
only gets charged while charging the Twizy and while
driving (from the main battery).<br>
<br>
The OVMS with GPS activated needs a constant current
of ~110 mA according to my measurement, thus sucking
that battery empty within 4-5 days, maybe fewer.
I'll make the power warning much more prominent in
the Twizy user guide.<br>
<br>
Have there been any considerations yet about using
the sleep mode of the PIC and/or SIM chipset?<br>
<br>
Regards,<br>
Michael<br>
<br>
-- <br>
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal<br>
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26<br>
<br>
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</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26
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