Root causes of high deep sleep current [LoPy1, WiPy2 and SiPy], all the new modules **do not have deepsleep issues**

[seb]

@james_seth

Sent an email to salessupport@pycom.io if you need some deepsleep shields

[akshayjames]

@incognico Hi
The high current during deepsleep is due to the LTE module. LTE is started automatically during boot. You need to deinit LTE separately before calling deepsleep as LTE is not stopped automatically during deepsleep.
I had the same issue. My FiPy module was drawing 49mA during deepsleep. After I called LTE deinit, the current draw reduced by a lot at that time itself. After that deepsleep worked as expected. :)

from network import LTE
lte = LTE()
LTE.deinit()

Hope this helps.

[dmayorquin]

Hi @Fred, I need some help with the Pysense deep sleep mode. I have a SiPy + Pysense + 3.7 V LiPo battery (Using JST connector on Pysense). I'm testing Deep sleep mode from last version of Pysense library but I'm measuring high deep sleep current consumption.

My program disabled WiFi in boot.py. In main.py It blinks an LED for 5 seconds and then sleeps 20 seconds. These are my results:

SiPy firmware: 1.18.0
Pysense firmware: 0.0.8
Blinking: ~50 mA
Deep sleep: ~2.2 mA

main.py code:

from pysense import Pysense
import pycom
import time

py = Pysense()

#Turn-off heartbeat
if pycom.heartbeat() == True:
    pycom.heartbeat(False)

#Blink the LED
for i in range(5):
    pycom.rgbled(0x1F)
    time.sleep(0.05)
    pycom.rgbled(0x00)
    time.sleep(1)

#Sleep 20 seconds
py.setup_sleep(20)
py.go_to_sleep()

boot.py code:

from network import WLAN

wlan = WLAN()
wlan.deinit()

I tried other SiPy firmware versions (1.13.0.b1, 1.15.0.b1, 1.17.3.b1, 1.19.0.b4) but results are the same. @daniel said a few months ago this Pysense issue was resolved, but can you confirm if there is still something wrong with Pysense? Or, am I missing some line of code to make deep sleep mode works as it should? Thanks in advance.

[Radec]

@dmayorquin I think you forget lines codes :
Example with timer :

import machine
machine.deepsleep(3600000 )  # 1 hours

[dmayorquin]

Hi @radec, thanks. According to documentation, machine.deepsleep() works well when you are not using a shield or expansion board, but in my case I'm using SiPy + Pysense, so I must use the deep sleep methods of Pysense library. I've found a solution which I posted here:

https://forum.pycom.io/topic/3594/how-to-deep-sleep-with-sipy-pysense-3-7v-lipo

By the way, I also tried machine.deepsleep() with my setup, but didn't work (the deep sleep current was ~60 mA).

[mattliddle]

@Fred What do you need to do to accomplish that low of power consumption on the GPy with deep sleep? I'm getting about 18 mA when it's going into deep sleep..

import machine

# and later on in the code once my sensor is done running, I call this
machine.deepsleep(30000)

What could be going on? does the GPy 1.0 need a power saving board as well? I've looked around on the forum only to find no real solution yet, but other users with the same issue.

[mattliddle]

@mattliddle @Fred I discovered an important insight! When powering it through USB (I'm using the expansion board 2.1) there is an LED light that turns on and stays on even in deep sleep. I was measuring current draw and it was always at least 14 mA. I tried powering the device outside of the expansion board by a 3.7V source, and in deep sleep, sure enough it dropped into the microamp range. Even when it is on expansion board 2.1 and powered through battery instead of usb, the LED stays turned off, and therefore power consumption will drop into the micro amp range.