LoPy+Expansion board+Deep Sleep Shield only down to 18mA

[Lokefar]

I have been experimenting with the Deep Sleep Shield, expansion board and a LoPy and trying to get the sleep working at as low a power consumption as possible. So fare I'm only able to get to 18mA. This is by using the example code for the Deep Sleep from the Docs and with

wlan.deinit()

But I still can reproduce what other people on the forums have. Anyone got any ideas?

[Rachelsimida]

@ledbelly2142
Hi ledbelly2142

I am doing a project with the same devices as you. I am a begineer of IoT and it seems I can learn something from your experience. May you share the whole code you have done of this deep sleep shield connected with LoRa, if you still have it. Thanks in advance!

Regards
Rachel

[Rachelsimida]

@lokefar Hi Lokefar

I am doing a project with the same devices like yours. I am a begineer of IoT and it seems I can learn something from your experience. May you share the whole code you have done, if you still have it. Thanks in advance!

Regards
Rachel

[ledbelly2142]

With the deep sleep shield and library, the lowest I have been able to get is 604 uA (not plugged into USB)

On wake, tranmissions in LoRa are around 150 mA with an 'on' state of 40 mA.

Wake up, send transmission, sleep.

[Lokefar]

@jcaron I got the time to test this today and you are correct. Got the 600uA in deepsleep. Thanks for the help :)

[jcaron]

@Lokefar I believe the lowest power consumption is only achievable with a battery connected via the LiPo connector, someone else may be able to confirm.

[Lokefar]

@jcaron Yes, that's the one.

I am using a USB cable hooked to a powerbank. On the USB cable I have attached the power measuring.

[jcaron]

@Lokefar are you using the example here:

https://docs.pycom.io/chapter/datasheets/boards/deepsleep/api.html

Also, are you measuring from battery or over USB or...?