Lopy4 deep sleep problem

[pierremarsot]

Hi everyone,

I have a Lopy4.

My code in boot.py :

from network import WLAN
from network import Bluetooth
import pycom

pycom.wifi_on_boot(False)

# disable the heartbeat LED
pycom.heartbeat(False)

# Disable bluetooth
bluetooth = Bluetooth()
bluetooth.deinit()

# Disable wifi
wlan = WLAN()
wlan.deinit()

My code in main.py :

from network import LoRa
import socket
import machine
import time

lora = LoRa(mode=LoRa.LORAWAN, region=LoRa.EU868)
while not lora.has_joined():
    time.sleep(2.5)

s = socket.socket(socket.AF_LORA, socket.SOCK_RAW)
s.setsockopt(socket.SOL_LORA, socket.SO_DR, 5)
s.setblocking(True)

s.send(my sensor data)

s.setblocking(False)

print("enter sleep")
# time.sleep(config.timeToSleepLora)
machine.deepsleep(20000)

My Lopy consume 80mA during deepsleep step, is it normal ?
I power it with a power supply on 5V and no led.

Thanks.

[iwahdan]

Hello @pierremarsot , No This should not be the normal power consumption during deep sleep.
Which Firmware are you using on the board (stable or Development)?

Also are you connecting the LoPy4 to any external Circuit?

[pierremarsot]

@iwahdan Thanks for your reply.

I using the last stable firmware (checked this morning).

What do you mean about "external circuit" ?
I power the Lopy4 with an power supply which is power with two options : USB or 5V. So yes, with my point of view, it's an external circuit.
But i have the same problem when I power the Lopy directly with the board 3.0

[tobz]

Is Bluetooth turned on by default? Does it need to be desalinized/turned off to save power?

[pierremarsot]

@tobz I call Bluetooth deinit function in boot.py
So Bluetooth should be turned off ...

[tobz]

@pierremarsot Yeah I saw that, I just assume d it was already off... is that not the case?

[pierremarsot]

@tobz No. It's not disable by default. You need to called deinit function

[tobz]

@pierremarsot Very good to know, thanks for confirming :)

[pierremarsot]

So, do you have any idea why the LoPy4 consume 80mA in sleep mode ?

[MarcoBenini]

@pierremarsot said in Lopy4 deep sleep problem:

000

Try to close the socket ( s.close ) after your "s.setblocking(False)" and check if the radio module goes to sleep.

[iwahdan]

Hi @pierremarsot , Actually there is no need to disable bt/wifi or Heartbeat before deepsleep, they are disabled automatically when calling machine.deepsleep also the LoRa modem is turned off in deepsleep.

I've actually ran you code on a LoPy4 and I get an Avg current consumption in deepsleep = 27uA.

[pierremarsot]

@iwahdan Strange ...
I'll check again the consumption tonight but i was pretty sure

[pierremarsot]

@iwahdan Sorry but i have an consumption higher (see picture)
Maybe i didn't do the right thing ...

[iwahdan]

Hi @pierremarsot, I cannot totally get from the picture how you setup the circuit , if you could share the circuit diagram along with pin connections I could try to test with your setup.

[pierremarsot]

Tanks @iwahdan
Can you see clearly on this picture ?

Basic circuit. Powered by a power supply (12Vdc / 3A) on 3.3V PIN
I tried on 5V PIN, i got a consumption around 65mA

[iwahdan]

@pierremarsot , This is NOT how you power on any of pycom Devices.

Maximum voltage you can use is 5.5v and you Connect to Vin not 3.3v pin! , the 3.3v pin is actually used for supplying 3.3v output.

please use this pinout diagram as a guideline

[pierremarsot]

@iwahdan
Ok, thanks for this issue, sorry ...

I just tried with an 5.5V power supply (checked with multimeter) and i got a consumption around 63mA in deep sleep.
Same circuit, just changed power supply input and connected with 5.5v PIN.

[iwahdan]

@pierremarsot, well it might very well be that your Lopy was damaged in some way or something got shortened , do you have another device that you can try?

[Sympatron]

@pierremarsot said in Lopy4 deep sleep problem:

Basic circuit. Powered by a power supply (12Vdc / 3A) on 3.3V PIN

What do you mean by that? Did you connect 12V to the 3.3V Pin? This would certainly damage the device...

[pierremarsot]

Hi @sympatron
Yes, I connected the 12V to the 3.3V and 5V PINs ...
I thought my power supply transformed the 12V input in 5V output but after some tests, it didn't ...

I used this one : https://www.amazon.fr/SODIAL-Planche-Compatible-puissance-bricolage/dp/B015NUN4QI/ref=asc_df_B015NUN4QI/?tag=googshopfr-21&linkCode=df0&hvadid=106796343001&hvpos=1o3&hvnetw=g&hvrand=2025127917332645665&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9055144&hvtargid=pla-208287294001&psc=1