[Ovmsdev] Introducing myself and questions on deep sleep

[Patrick Stein]

Hello Michael,


> On 14. Nov 2022, at 17:26, Michael Balzer <dexter at expeedo.de> wrote:
> 
> Am 14.11.22 um 10:25 schrieb Patrick Stein:
>>> As written in the issue discussion, there's a minimum load from the unswitchable components. In deep sleep mode, that's around 155 mW with the GPS antenna attached, and ~ 100 mW with GPS antenna detached. An option to control the GPS antenna could be using a simple 12V relay, either on SW_12V or on the ignition 12V line, to switch the antenna's GND connection.
>>> 
>> I’ve never seen such a low value - lowest I’ve seen is 250 mW in deep sleep with all my four modules. 
> I did the measurements using a USB power meter, just verified with a multimeter for 12V (11.6V Lipo), which gave slightly higher results:
>     • base load in Wifi mode, GPS antenna attached ~ 60 mA / 700 mW
>     • sleep, GPS antenna attached ~ 16 mA / 180 mW
>     • sleep, GPS antenna detached ~ 11 mA / 130 mW
> 
> So nowhere near 250 mW. Mark, any idea about this?

I now know why you have different measurements. I bought a USB power meter and it just arrived and it’s now clear. I have just tried one module (v.3.3 with the current edge software) asleep at 9 Volts and it draws around 490 mW (54-55mA) , when I switch my lab power supply off it draws 290mW at 5.1Volts (55mA) over USB. 

So it seems that the module requires a lot less over USB than over OBD.

Best regards, Patrick