New order of LoPy - deep sleep issues?

[dbrgn]

With nothing but the LoPy4 connected to the Otii (at 3.75V with auto range mode) I measure ~32uA in deep sleep.

Is this the best we can expect, or should it go lower?

This is the code (boot.py):

import machine
import pycom
pycom.heartbeat(False)
pycom.wifi_on_boot(False)
machine.deepsleep(15000)

As soon as I connect it to the expansion board (with all jumpers removed, power supply via JST connector) current goes to ~170uA.

[beyonlo]

@dbrgn Don't need to disable the Bluetooth/BLE too, like as you did with WiFi (pycom.wifi_on_boot(False)) ?

[dbrgn]

I think I wouldn't even need to disable wifi on boot, since it should be off in deep sleep anyways.

[beyonlo]

@dbrgn All right, so that's two lines are unnecessary:

pycom.heartbeat(False)
pycom.wifi_on_boot(False)

[Robin]

@beyonlo have you also found that the LED flickers on after resetting from deep sleep?

[beyonlo]

@robin I have not tested that.

[peekay123]

I'll give it a test tonight as well.

[peekay123]

So, with the simple code below, the heartbeat LED pulses very briefly when my LoPy wakes from deep sleep.

[dbrgn]

Since last time I tried the test script again, with the latest firmware (from 3 days ago). Now I get down to 16.5 uA. Not sure if the firmware is related.

Interesting is that when testing the same board on our custom hardware, I can get down to ~13uA. Maybe because some pins aren't floating anymore?

Anyways, it seems to be possible now to get below 20uA in deep sleep.

Edit: And I also sometimes experience the issue that the LED quickly lights up when waking up from sleep or when powering on the device for the first time.

[sioo]

@dbrgn How did you get it down to 16.5uA? I'm currently reading around 30uA in deep sleep.

[jcaron]

@sioo can you clarify your setup? LoPy or LoPy 4? Deep Sleep shield, expansion board, Pysense, PyTrack? Power source? Any active sensors?...

[sioo]

I'm using an Lopy4 powered by a Lifepo4 battery. For testing purposes I'm reading a sensor (bme280), sending the data using lora and then going to sleep for about 10 minutes.