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

[jcaron]

@jalperin from what I understood, the Pysense (and Pytrack) boards actually incorporate what is present on the deep sleep shields.

However, there is still a lingering issue on the Pysense (not the Pytrack) which still uses more current than it should in deep sleep, still waiting for a solution for this.

[daniel]

@jcaron the reason for the higher current on the Pysense is because the sensors need to be disabled as part of the process of going to deepsleep. We will add that to the official library within the next few days.

Cheers,
Daniel

[jalperin]

Thank you @jcaron.

Unfortunately, I remain where I started. I am unsure whether I am shutting down WiFi and Bluetooth (I read various posts), and I am unsure how to properly get both the pysense and lopy to deep sleep.

Do I understand it correctly that I don't really need the deep sleep shield but I do need new libraries (that will show up in a few days and will hopefully contain examples)? If so, how does one shut off wifi and bluetooth?

Thanks for your help.

[jcaron]

@jalperin With the Pysense board, you need to:

• use the libraries that are available on github:
  https://github.com/pycom/pycom-libraries/tree/master/pysense/lib

• add the following code:

  from pysense import Pysense
  py = Pysense()
  py.setup_sleep(number_of_seconds)
  py.go_to_sleep()
  

This will tell the Pysense to stop the LoPy (including Wi-Fi, BT, LoRa...). It's actually powered off. It will be woken up after the given number of seconds has elapsed. Work is in progress to allow wake up on other conditions (some input going high for instance).

At the moment, this will bring down power consumption to about 2.5 mA when running from a LiPo battery. Ultimately it should go down to a fraction of that once everything is correctly shut down.

Note that when the LoPy comes out of deep sleep, it's as if it just rebooted. There are still issues with LoRa keeping state for instance.

As the firmware turns on Wi-Fi when it starts, it's a good idea to stop it right away if you don't need it during the time the LoPy is awake. Not sure about Bluetooth (I stop it, but I'm not sure that's actually needed).

Hope that helps.

[jalperin]

Thank you, @jcaron. Very helpful.

I have been executing that code, but followed by machine.deepsleep(). I gather that is not necessary. Correct?

So, lastly, exactly how does one turn off wifi and bluetooth (I've read different methods in this forum)?

[jmarcelino]

@jalperin
This works to turn off WiFi

import network
n = network.WLAN()
n.deinit()

Turning off Bluetooth would be similar but for network.Bluetooth() instead.
However removing Bluetooth doesn't change anything in power consumption at the moment - but also it won't be on or consuming anything unless you had previously initialised Bluetooth() in your code. So it's actually better to do nothing at all for the Bluetooth side.

[jalperin]

Thanks jmarcelino.

Does the below earlier comment of yours still apply?

By the way I found that if I do:

from network import WLAN
wlan = WLAN(mode=WLAN.STA)
power saving is enabled, but if I use this instead it doesn't:

from network import WLAN
wlan = WLAN()
wlan.mode(WLAN.STA)

[chrisi]

If I order another Sipy now will the deep sleep feature be fixed or will I still need a shield?

[bucknall]

@chrisi you will need to order a shield - the SiPy can also use the Pytrack/Pysense to sleep as well.

[jcaron]

@bucknall From what I understood, you will automatically receive a Deep Sleep Shield with any new orders. I know I received shields with the boards I ordered week before last.

[bucknall]

@jcaron That is correct, my wording was slightly confusing! If you order any of our devices (WiPy 2.0, LoPy or SiPy) you will automatically be sent a deep sleep shield.

[jcaron]

@daniel said in Root causes of high deep sleep current:

@jcaron the reason for the higher current on the Pysense is because the sensors need to be disabled as part of the process of going to deepsleep. We will add that to the official library within the next few days.

Hi @daniel,

• is this actually confirmed to be a purely software issue?
• has there been any progress with the libraries? I've seen a few updates pushed on Monday, but I don't think they're relevant to this issue?

The other thing I really would like to see is the ability to wake on pins (and the related control of the pins connected to the PIC on the Pysense, which from what I understand will be the only pins which can used for wake up?)

Thanks,

Jacques.

[tlntu]

@bucknall My colleague and I have made total of 3 orders ( 7 LoPy development boards in total), but the deep sleep shield didn't come with our orders. May I know where can I order the deep sleep shield? I've contacted the support team, but haven't got any reply from them.

[bucknall]

Hi @tlntu,

I'm asking our sales team where the deep sleep shields are - could you please send me an email (alex@pycom.io) with your order number?

Thanks!

Alex

[tlntu]

@bucknall I've sent an email to you with our order numbers.

[avbalen]

@bucknall
For the record: my deepsleep shields came in yesterday

[yahia]

Just arrived today! Thanks

[daniel]

@jcaron and everyone. We have fixed the deepsleep current issue of the Pysense. As explained before, it was just a software thing (the pressure sensor needed to be powered down). Just use the new library: https://github.com/pycom/pycom-libraries/blob/master/pysense/lib/pysense.py

And you'll enjoy a current of only 10uA during deepsleep :-)

[dbrgn]

@daniel said in Root causes of high deep sleep current:

@jcaron and everyone. We have fixed the deepsleep current issue of the Pysense. As explained before, it was just a software thing (the pressure sensor needed to be powered down). Just use the new library: https://github.com/pycom/pycom-libraries/blob/master/pysense/lib/pysense.py

Great, thanks! :) Will test it tonight or tomorrow.

[jcaron]

@daniel Woohoo! Too bad I don't have my LoPys at hand to test right now, but I will do so as soon as I can.

While you have your hands in there, any chance for wake on pin on the Pysense?

Thanks!