M5Dial, no wake up with button

HappyUser

Thank you all for sharing your insights. I hope it offers help to others.

For us it means back to the drawing board.
Regards to you all.
Btw, M5Din meter is also not an option because I recognize the same electronic scheme.

felmue

Hello guys

@Cognitive5525 : I think I know the reason for that 5 V connection between M5Stamp and the M5Dial board. It is required for battery charging when powered from USB. But M5Stack probably should have used a diode there to make sure power can only flow from USB to the battery charger, but not the other way round.

BTW: as an experiment to prove the above I removed the 5 V connection between M5Stamp and M5Dial board and now I can power M5Dial from the green connector and it does a proper shutdown (same as when powered from battery) and can be woken by the wake button.

Please note: If you go that route yourself, please be aware that I cannot be held responsible for any damage that might occur and you most likely void the warranty of your M5Dial.

Thanks
Felix

HappyUser

Wow, I take full responsibility for my own. But how did you do that? Please elaborate.
I assume you removed the 5volt pin of the M5Stamp. ?

felmue

Hello @HappyUser

correct, that is what I did. I removed the 5 V pin of the M5Stamp.

Thanks
Felix

HappyUser

Final question : how did you enter sleep mode or power down?

felmue

Hello @HappyUser

please find my example here.

Thanks
Felix

Cognitive5525

@felmue said in M5Dial, no wake up with button:

BTW: as an experiment to prove the above I removed the 5 V connection between M5Stamp and M5Dial board and now I can power M5Dial from the green connector and it does a proper shutdown (same as when powered from battery) and can be woken by the wake button.

Excellent! Now I'm curious : what is the current consumption on the external power input when the board is powered off or "sleeping"

Cognitive5525

@felmue said in M5Dial, no wake up with button:

please find my example here.

I can see you import M5Dial.h is this supposed to be a part of M5Unified?
I use M5Unified.h in my code for my Core INKs..

felmue

Hello @Cognitive5525

please find my measurements here.

M5Dial.h includes M5Unified.h. See here.

Thanks
Felix

Cognitive5525

@felmue said in M5Dial, no wake up with button:

please find my measurements here.

What voltage did you use?

M5Dial.h includes M5Unified.h. See here.

Ah OK! I see you are using a "dedicated" library for M5Dial which in term relies on the "general" M5Unified library. I found a similar "dedicated" for the CoreINK but that seem not to use M5Unified.
So I stick with using M5Unified "directly"..

felmue

Hello @Cognitive5525

above measurements have been done via battery connector @ 4.2 V.

If I use the green connector (and with aforementioned hardware modification) then in shutdown mode I measure about: ~ 1.5 mA @ 6 V

I guess the higher shutdown current (compared to when powered via battery connector) is due to the DC/DC converter converting +VIN into +5VIN and the battery charger IC which both stay powered even in shutdown mode.

Thanks
Felix

HappyUser

Thanks to Felix.
I also tried his solution of removing the 5V pin from the M5Stamp, power down and wake up with button works perfectly. Even in combination with power timer sleep. Very low current. A big relief for us, save us a lot of time (and €) to find another solution for an unexpected behaviour. Many thanks to Felix!
Btw, you really have to cut the 5 volt pin short because otherwise it still makes contact.

felmue

Hello @HappyUser

you are very welcome. I am glad to hear you got it working to your liking. And thank you for reporting back.

Thanks
Felix