Using Beagle for remote data collection; Keep in deep sleep mode and waking up to collect data

[Mark A. Yoder]

I have a project where the Beagle is collecting data in a remote location so it must run off of batteries.  I need to power off everything on the processor that can be, then I need it to be in a deep sleep mode, then every 5 minutes or so, wake up, take some data and the go back to sleep.

What things can be powered off, both on chip and on board?  I see some discussion about powering off the HDMI.  How do I do this?

Do I need to power off the PRUs?  What else?

I see echo mem > /sys/power/state puts the Bone into a low power mode.  How do I get it out of the mode? Would a crontab entry wake things up?

Thanks for any help.

--Mark

[John Syne]

This link might be helpful:

https://01.org/blogs/rzhang/2015/best-practice-debug-linux-suspend/hibernate-issues

Regards,

John

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[William Hermans]

Mark,

Have you considered  using an external embedded MCU for this task ? e.g. . . .

Board boots, does its thing, notifies and external MCU it's about to shutdown, then shuts down. The MCU then breaks the connection from battery to beaglebone, reconnects after 5 minutes, and toggles RESETn.

As for which MCU ? That up to you, but there are MCU's that can run off a single button cell for 10 + years . . .