GPY deepsleep High current

[bouchard.claude]

Hi,
I'm having lot of issue putting my GPY in deepsleep mode.
It's running on battery and using LTE CAT-M. I measure 0.7 to 0.8 mA in deepsleep mode . Is it normal? Anything i'm missing on the code part?
( I need to add timer making sure we are not stuck if network is not attaching, but it does not seem to be the thing draining the battery fast)

from machine import Pin
import utime
import time
import socket
import urequests
import machine
from network import LTE

def main():
    lte = LTE()
    lte.init()
    #Power the sensor
    pinPwr = Pin('P22', mode=Pin.OUT)
    pinPwr(True)

    lte.attach(band=XX, apn="XXXX")
    print("attaching..",end='')
    while not lte.isattached():
        time.sleep(0.25)
        print('.',end='')
        print(lte.send_at_cmd('AT!="fsm"'))         # get the System FSM
    print("attached!")
    lte.connect()
    print("connecting [##",end='')
    while not lte.isconnected():
        time.sleep(0.25)
        print('#',end='')
        print(lte.send_at_cmd('AT!="fsm"'))
    print("] connected!")


    # initialize `P11` in gpio mode and make it an output to trigger sensor measure
    p_out = Pin('P11', mode=Pin.OUT)
    # initialize `P10` in gpio mode and make it an input to receive data from sensor
    p_in = Pin('P10', mode=Pin.IN)

    # Let the sensor settle for a while
    time.sleep(0.5)

    #set the gpio to high for 10 microsecond to indicate to the sensor we want a measurement
    p_out.value(1)
    time.sleep(0.00001) # wait 10 microseconds
    p_out.value(0)

    # Create variable start and give it current time
    start = utime.ticks_cpu()
    anti_stuck = utime.ticks_ms()

    # Refresh start value until the ECHO goes HIGH = until the wave is send by the sensor
    while ((p_in.value()==0) and (utime.ticks_diff(utime.ticks_ms(),anti_stuck) <= 5000)):
        start = utime.ticks_cpu()
    # Assign the actual time to stop variable until the ECHO goes back from HIGH to LOW
    while ((p_in.value()==1) and (utime.ticks_diff(utime.ticks_ms(),anti_stuck) <= 5000)):
        stop = utime.ticks_cpu()

    # Calculate the time it took the wave to travel there and back
    measuredTime = (utime.ticks_diff(stop, start)) /1000000
    # Calculate the travel distance by multiplying the measured time by speed of sound
    distanceBothWays = measuredTime * 33112 # cm/s in 20 degrees Celsius
    # Divide the distance by 2 to get the actual distance from sensor to obstacle
    distance = distanceBothWays / 2
    # Print the distance
    print("Distance : {0:5.1f}cm".format(distance))
    data = '{\"distance\":' + str(distance) + '}'
    url = 'http://xxxxxxxxxxxxxx.com/telemetry'
    res = urequests.post(url, headers={"Content-Type": "application/json", "Accept": "application/json"}, data= data)
    res.close()
    time.sleep(2)
    lte.detach()
    lte.deinit(detach=False, reset=True)
    pinPwr(False)
    time.sleep(20)
    print("going to sleep now..")
    machine.deepsleep(21600000)

    # Run the main function when the script is executed
if __name__ == "__main__":
    time.sleep(15) 
    while(True):
        main()

[kjm]

My understanding is that lte.deinit with detach=False leaves the modem radio switched on during deepsleep. Maybe try a regular lte.deinit() instead?

[peterp]

Yes! If you're not using PSM https://development.pycom.io/tutorials/lte/power/#power-saving-mode you most likely don't want to use detach=False

[bouchard.claude]

Thanks, I will try this and see if it help ! For now I Have aroung 280 uA after removing the detach. Wish is way better, but I think I should be able to get lower than that?? I was expecting agout 50-60 is i'm not mistaken?

Also after monitoring the system with the serial interface , I saw that I got a 'LTE modem is in data state, cannot send AT commands' while connecting ( it only happen rarely). This crashed the execution and may explain why my batteries where draining so fast ( maybe the module got stuck in a crashed state, in full power mode). I removed the AT! debug command and also added a watchdog ( using WDT). That explain why battery goit drained very fast, but not explain the still high current..
Many thanks for the help and ill keep you posted

[bouchard.claude]

Small update: I tried with this very simple code to eliminate LTE modem issue:

import machine
import time
time.sleep(20) 
machine.deepsleep(30000)

and i Got the same 280 uA current on deepsleep. So Im not sure if at that point I should look at the board itself ? My understanding is that if I dont init any radio, everything should be off...

[tuftec]

@bouchard-claude The latest firmware actually has the LTE modem enabled on boot so that may still be an issue. You may still need to disable it, but understand from other reading that this is a know issue currently that is still to be fixed.

You might need to check your logic external to the Gpy device. Try forcing the output pins into a defined state (using the pin hold function) prior to going into deepsleep, to minimise any leakage paths.

[bouchard.claude]

@bouchard-claude said in GPY deepsleep High current:

from network import LTE

Thanks @tuftec , funny enough, I was actually testing this as you wrote me this reply. So I ran this simple code with nothing attached to the GPY ( powered by VIN). I'm not 100% sure of my code, But I think it really make sure I dont have any pull resistor on any pin + making sure the LTE if off. and im still getting the exact same 280 uA while deepsleeping... im still trying to figure out

import machine
import time
from machine import Pin
from network import LTE
time.sleep(10) 
p_in = Pin('P1', mode=Pin.IN, pull=None)
p_2 = Pin('P2', mode=Pin.IN, pull=None)
p_3 = Pin('P3', mode=Pin.IN, pull=None)
p_4 = Pin('P4', mode=Pin.IN, pull=None)
p_8 = Pin('P8', mode=Pin.IN, pull=None)
p_9 = Pin('P9', mode=Pin.IN, pull=None)
p_10 = Pin('P10', mode=Pin.IN, pull=None)
p_11 = Pin('P11', mode=Pin.IN, pull=None)
p_12 = Pin('P12', mode=Pin.IN, pull=None)
p_19 = Pin('P19', mode=Pin.IN, pull=None)
p_20 = Pin('P20', mode=Pin.IN, pull=None)
p_21 = Pin('P21', mode=Pin.IN, pull=None)
p_22 = Pin('P22', mode=Pin.IN, pull=None)
p_23 = Pin('P23', mode=Pin.IN, pull=None)

lte = LTE()
lte.init()
lte.deinit()
print('sleep')
machine.deepsleep(30000)

[tuftec]

@bouchard-claude
I would expect that the power consumption should be pretty low with your test setup. I think we need some comment from Pycom on this one.
I expect it is still tied up with the LTE modem power down bug.

[bouchard.claude]

@tuftec You are right as this setup cannot be more simple and it show a consumption many more time the one I was planning for according to the doc, affecting greatly my estimated battery life ( wake up 2 time a day, so most of current is sleeping). I'm not sure how to get the attention of someone from Pycom as this is a community forum, but I think we will require this ( I really dont know what else I can test on my side).
Ill try to understand how it work to contact them or if they read message on this board.

Meanwhile thanks for the help.

[tuftec]

@bouchard-claude
@Gijs can you help with this one. Maybe you could supply some clarity on the expected low power performance when using LTE.

Peter.

[kjm]

@bouchard-claude Try

import pycom; pycom.lte_modem_en_on_boot(0); pycom.wifi_on_boot(0)

at the start of your program to be sure both radios are off to begin with. My gpy (1.20.1.r1) deepsleeps at 40uA

[tuftec]

@kjm Sure just setting those boot flags once the program has started is too late. They will alter the next boot behaviour but not this one???????

From what I have read a lte.init(); lte.deinit() cycle should power the modem down.
Maybe the issue is actually the wlan. In my setup the wlan is on by default at boot and I specifically disable it with wlan.deinit() when I no longer need it, based on the status of a switch.

[bouchard.claude]

@tuftec Yeah, my understaning too is that thoses flag are to be set once, cause once the main.py is loaded, its way too late. But I did try and set the wifi on boot to 0 using the shell over serial, and I did re-test with no difference. As for the LTE on boot, well, I really need to use it during operation ( data is sent overs CAT-1 LTE). I can try and test it tomorow, but that wont solve my problem :S ( but maybe it would point to a direction)

[tuftec]

@bouchard-claude Yes, I understand you need LTE but do you use wifi (wlan).
In my application I use wlan, lora, sigfox & nb-iot. I make decisions at various stages in my code to enable/disable the relevant radio system that I need.
The wifi is typically on when the system boots so that you can set up a REPL connection over wifi. I deliberately turn it off and disable the REPL server at and early stage when I determine that I do not need it. turn it on only as a system configuration aide in the field. Otherwise, I need it to be off for security. You might need to explore turning off all the bits you do not need.

[bouchard.claude]

yes, exactly what i'm doing too. This project only required LTE, so im only powering one the LTE radio, and only during time for transmission and deinit it after. As for the Wifi, I did set the power_on_boot to off as a first setup thing once I pushed the initial code.

So I just did the test with the lte_on_boot and wifi_on_boot ( I set them manualy + put them in a empty main.py code with only thoses and a deepsleep command) and the current stayed a 266 uA all the time in the deepsleep. So even with the radio not on at boot the currect of the board is high
I'm using GPy with firmware version 1.20.2.r3 . Any way to see what changed between version?

[tuftec]

@bouchard-claude You could try wading through all the release logs looking for changes, but I have not found a lot of joy in that previously. Maybe you need to test the old 1.20.1r1 release on you Gpy. Hopefully that will provide some insight.

I would also do the wlan init/deinit thing early in your code just to be sure it is off. Also disable the server in the same way. server.deinit() after you have defined it. The server interacts with the wlan. I am not sure if it enables it without you knowing. Worth a try anyway.

[bouchard.claude]

Yeah, but all the test im running now are with no code , Only the deepsleep and the stuff we are trying ( no lte on boot, no wifi on boot, lte deinit() ...) and it has the exact same current draw then with my complete code during deepsleep.

A weird things I just found is every time I run this to check my firmware version:

import sqnsupgrade
sqnsupgrade.info()

it give me the info, then immetiatly crash, core dump and restart . So maybe something is up with the whay the firmware deal with the modem? Ill try and switch versions to see if it help.. And also will try on a different GPy ( and a fipy) when ill have some time

[tuftec]

@bouchard-claude Are you getting the crash with your current measuring device in circuit? Previously when I was doing low current measurements, on devices that were capable of considerably higher current draw, I would wire a shut switch across my meter so that I could bypass it when I needed full current. Usually a device capable of measuring ultra low currents is not capable of handling the full power requirements of the device.
Typically I would start the system with the shut switch closed, then place the device into its low power state and open the switch just to take the low current measuement. This avoids any issues with large voltage drops across you meter when the current ramps up.

[bouchard.claude]

@tuftec Exactly what I do too ;) I have a shut switch that i open once the device is deepsleeping only. ( my test that make it crash is using the USB connection and the breakout board to a computer, no current measurement taken during this test.)

[tuftec]

@bouchard-claude Interesting.
Just tried the sqnsupgrade.info() test with a FiPy on my breakout board (V3.1) and get exactly the same issue. It crashes after displaying the modem information. Something about a prohibited Store!!!!!

>>> import sqnsupgrade
2020/12/30 17:34:59: import sqnsupgrade
>>> sqnsupgrade.info()
2020/12/30 17:35:20: sqnsupgrade.info()
<<< Welcome to the SQN3330 firmware updater [1.2.6] >>>
>>> FiPy with firmware version 1.20.2.r3
2020/12/30 17:35:29: Your modem is in application mode. Here is the current version:
2020/12/30 17:35:31: UE6.0.0.0
LR6.0.0.0-41019

IMEI: 354346090972786
Guru Meditation Error: Core  0 panic'ed (StoreProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x4019072a  PS      : 0x00060830  A0      : 0x801901df  A1      : 0x3ffbaef0  
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x00000005  A5      : 0xffffffff  
A6      : 0x00021266  A7      : 0x00060021  A8      : 0x8018fde0  A9      : 0x3ffbaeb0  
A10     : 0x0000002c  A11     : 0x00000000  A12     : 0x3ffb9f28  A13     : 0x00000000  
A14     : 0x3ffb9f38  A15     : 0x00000001  SAR     : 0x00000000  EXCCAUSE: 0x0000001d  
EXCVADDR: 0x0000002d  LBEG    : 0x4009412c  LEND    : 0x4009415a  LCOUNT  : 0xffffffff  

ELF file SHA256: 0000000000000000000000000000000000000000000000000000000000000000

Backtrace: 0x4019072a:0x3ffbaef0 0x401901dc:0x3ffbaf10 0x40180044:0x3ffbaf30

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================= CORE DUMP END =================
Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8020,len:8
load:0x3fff8028,len:2128
load:0x4009fa00,len:19760
entry 0x400a05bc
2020/12/30 17:35:37: SYSTEM RESTART?```

Maybe @gijs can help here.

I have not seen this previously.
Maybe something to do with firmware V 1.20.2.r3 ????