I ran the numbers with some pretty accurate equipment, but (particularly in the radio tests) different modules gave wildly different values. Even on one module, consumption jumped up and down dramatically. A better test would be consumption over time, to get an average. Anyway, here are the results I got for various tests: State SIM36xx SIM76xx GPS Antenna WIFI AP WIFI Client DEEP SLEEP CAN1 Volts mA mW Diff Notes Everything off, USB powered FALSE FALSE FALSE FALSE FALSE FALSE FALSE 5.0844 60.6 308.1 +GPS antenna FALSE FALSE TRUE FALSE FALSE FALSE FALSE 5.0832 66.7 339.0 30.9 +CAN1 started FALSE FALSE TRUE FALSE FALSE FALSE TRUE 5.0822 71.8 364.9 25.9 +WIFI client FALSE FALSE TRUE FALSE TRUE FALSE TRUE 5.0812 76.0 386.2 21.3 +WIFI AP instead of client FALSE FALSE TRUE TRUE FALSE FALSE TRUE 5.0707 126.0 638.9 252.7 +WIFI AP and client FALSE FALSE TRUE TRUE TRUE FALSE TRUE 5.0707 126.0 638.9 0.0 Everything off, 12V powered TRUE FALSE FALSE FALSE FALSE FALSE FALSE 12.0000 17.2 206.4 5V USB supply shows 5.0961V, 9.6mA, 48.9W +GPS antenna FALSE FALSE TRUE FALSE FALSE FALSE FALSE 12.0000 66.7 800.4 594.0 Deep sleep FALSE FALSE FALSE FALSE FALSE TRUE FALSE 12.0000 1.9 22.8 -777.6 SIM5360 modem connected but off FALSE FALSE FALSE FALSE FALSE FALSE FALSE 12.0000 22.9 274.8 252.0 SIM5360 modem connected but off FALSE FALSE FALSE FALSE FALSE TRUE FALSE 12.0000 7.2 86.4 -188.4 SIM7600 modem connected but off FALSE FALSE FALSE FALSE FALSE FALSE FALSE 12.0000 27.0 324.0 SIM7600 modem connected but off FALSE FALSE FALSE FALSE FALSE TRUE FALSE 12.0000 15.6 187.2 -136.8 Everything off, 12V powered FALSE FALSE FALSE FALSE FALSE FALSE FALSE 12.0000 46.6 559.2 5V USB supply shows 5.0961V, 9.6mA, 48.9W +GPS antenna FALSE FALSE TRUE FALSE FALSE FALSE FALSE 12.0000 52.0 624.0 64.8 +WIFI client no AP FALSE FALSE TRUE FALSE TRUE FALSE FALSE 12.0000 63.0 756.0 132.0 +WIFI AP no client FALSE FALSE TRUE TRUE FALSE FALSE FALSE 12.0000 79.0 948.0 192.0 +No WIFI but cellular FALSE TRUE TRUE FALSE FALSE FALSE FALSE 12.0000 110.0 1320.0 372.0 +The lot FALSE TRUE TRUE TRUE TRUE FALSE FALSE 12.0000 160.0 1920.0 600.0 +Deep sleep (GPS connected) FALSE TRUE TRUE TRUE TRUE TRUE FALSE 12.0000 40.3 483.6 -1436.4 +Deep sleep (GPS disconnected) FALSE TRUE FALSE TRUE TRUE TRUE FALSE 12.0000 35.2 422.4 -61.2 Note that the USB async serial chip is powered by USB and draws about 49.9mW. When powered by 12V vehicle power, that goes to zero. I too see about 60mW for the GPS antenna. But the biggest surprise was the difference between SIM36xx and SIM76xx modems on power down. SIM7600 almost 100mA greater usage power down. I can’t explain that. Something in the SIM76xx is pulling a lot of power even when powered down. Also, bizarrely, toggling the DTR (EGPIO#2) line (implemented in 3.3 to help with sleep) off increases 1.3mA @12V! Anyway I will work with the manufacturer to try to find out what is using the power in the SIM7600 power down mode. Regards, Mark
On 3 Feb 2023, at 10:47 PM, Michael Balzer <dexter@expeedo.de> wrote:
Signed PGP part Mark,
in the thread with Patrick Stein I measured the GPS antenna at ~ 5 mA / 55 mW, and added that info to https://docs.openvehicles.com/en/latest/userguide/warnings.html#average-powe...
GPS consumption includes the active GPS antenna, which accounts for ~ 5 mA / 55 mW. Antenna power cannot be switched by the module.
ESP32 deep sleep mode (e.g. triggered by the power management module) reduces the consumption to ~ 15 mA / 165 mW with the active GPS antenna attached, or ~ 10 mA / 110 mW with the GPS antenna detached. The hardware isn’t capable to go any lower than this.
But maybe you can do a more precise measurement, I only have some basic electronics tools here.
Regards, Michael
Am 31.01.23 um 01:53 schrieb Mark Webb-Johnson:
Re: https://www.openvehicles.com/node/3545
I think it worthwhile having this discussion here. Synopsis seems to be:
Our modem design uses the SIMCOM reference design to power the active GPS antenna from VBAT. This increases power consumption (powering the active antenna), even if the GPS is turned off in software.
There is an alternative approach using pin 44 and the AT+CVAUXV / AT+CVAUXS commands to enable/disable and/or adjust voltage.
Would be interesting to see the exact power readings and impact this change would make. I will try to get these this weekend.
Regards, Mark
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