Xenon power consumption


#21

@ParticleD if you are replacing it then watch this youtube video first as there is one with auto switching and a test where both excellant devices go head to head. Seeing my poor results at measuring I am very tempted.


#22

Hey @Rftop what do you mean by “Wont shut down” The Argon if run off 3V3 pin is supposed to have EN pulled low. I have a better regulator to use with batter so will bypass the one on the board.


#23

@toogooda Ahhh… I didn’t catch that on the Argon Datasheet. The Boron is the opposite, EN pulled low to Disable the device. That makes sense now, since the Boron can’t be powered by the 3V3 Pin.
I’ll re-test. Sorry

[Edit] I can’t test Shutdown current on the Argon when Powered via 3V3 pin, since I have no way to disable the device without available Sleep Modes in the System Firmware yet. As you pointed out, grounding the EN pin is used to disable the on-board regulator (when powered from 3V3 pin) instead of disabling the device (shutdown).


#24

Wouldnt holding thr RST button in effectivly do that, I really just want to know what the dev board overheads are for example any ICs or jelly been components that will drain during deep sleep even when LDO is disabled (or removed ) Thanks mate.


#25

@toogooda, I have no idea

That method results in a higher current that what you are hoping for:

Measured with µCurrent GOLD, 3.32V on 3V3 Pin, EN Pin pulled LOW, Holding down RESET:
Argon 1.15 mA


#26

Thanks @Rftop you have been very helpful.

So my results were not that bad, that is the same result I got originally and yes it is too high for batteries.
My theory which we can’t prove untill we can put it to deep sleep is the following:

  • 4.00V on Li-Po Connector, EN Pin pulled LOW measuring 31 uA for Argon as above effectivly shuts off all power to the rest of the board and is only showing the quiescent power of the LDO and therefore not realistic for working out what the board overheads are Deep Sleep Consumption = CPU + LDO + Other Components.
  • 3.3v on 3v3 pin with EN grounded and RST button pressed gives the boards components and IC’s power but disables the CPU and the LDO, so will show LDO quiescent power + the other components (like lipo protection circuits)
    So my theory is using the dev board in deep sleep will be ~1.1mA + CPU deep sleep + LDO Quiescent power which will be <1.2mA.

In my experience it needs to have a deep sleep of < 0.1MA to make AA batteries viable. however I have always been able to find unessisary components to hotgun off the board like Serial TTL, lLEDs, and LDO.

If using AAs you can remove all the charge and protection ICs also and probably run for months that way.
If using the LIPO then can combine with a small solar panel and accept the higher sleep current.


#27

Nonsequitir here:
What is that meter?? I need that!


#28

The flexibility of sleep nodes that simply do work, and other nodes that augment the mesh network, is the best of both needs. You can trade off higher power consumption for improved communications as needed.


#29

You can find quite a few different versions on Amazon.


#30

Do you have a diagram of how you hooked up the mini Adafruit power meter to the Xenon? I am trying to test the mA drawn from the Xenon with two door sensors hooked up to it. Any help would be appreciated. Thanks.


#31

I bought male and female JST connector harnesses from Adafruit, attached them as shown in the pic, and put the meter in-line with the Xenon and its power supply…

ly.


#32

Thank you very much for the images. I was way over complicating this!