Pi Desktop - control power by button

And is no any chance to change this to remember last status power? And after lost power automatical start....?

In normal PC this option is available.

I agree with gadget.iom

It also seems you're trying to solve the wrong problem. A good solution wouldn't lose power and risk corrupting the microSD or hard drive/SSD.

Why not look into backup power (like a uninterruptable power supply or UPS) system. They are surprisingly easy to implement, but need some small bit of electronics design experience unless you can find an off-the-shelf one (which you can, because they exist).

I use UPS but after ups dead also raspberry power off. And then i must power on manualy( if i use pi desktop)

But when i connect power plug not for pi desktop but to RPI3 ? Disk mSATA SSD will work ?

The Pi doesn't have a power button. When you apply power, it boots. You're using an enclosure with circuitry and a power button. If the button works for you, great.

If it doesn't, at some point you'll have to either

(a) try it yourself, document precisely (to yourself at least, but you should publish it to help others in a blog post format) and then develop code (scripts perhaps) and some hardware to help you control the Pi in the manner that suits your needs, or

(b) use a known working design and live with the fact that it isn't precisely what you want unless you experiment and discover how to modify it, or

(c) - easiest option of all - Bigger battery for your UPS. Simple. Job done!

There are bits of hardware like SleepyPi that could be used to help you. It requires you to experiment though. If you go this path, please document it to help everyone.

Please explaine me more (a) and (b) point...

(a) requires you to design the solution. It could be a lot of work. If I type any more, I'd be writing scripts and laying out schematics for you..

(b) - easy, google 'home automation' or 'home automation with pi' to see other people's solutions.

But other people maybe not use Pi Desktop to Home Automation to connect Ssd disc.

Perhaps no-one else sees a need to use a desktop case for home automation, not fit a bigger battery, etc.

If you wish to be the first to develop some unique use-case, then you'll need some scripting and electronics experience.

I'm happy to recommend some books.

pepeel  wrote:

 

But other people maybe not use Pi Desktop to Home Automation to connect Ssd disc.

That may be because they evaluated the option and determined that it wasn't a feasible solution.

shabaz  wrote:

 

If you wish to be the first to develop some unique use-case, then you'll need some scripting and electronics experience.

On that subject, I noticed (while searching for possible solutions here) that the Pi Desktop board has an "MCU Program" header, My best guess is that this could be used to re-program the MCU with custom code.

There doesn't seem to be much information about it out there though, at least none that I could find. 

Hi Paul,

Interesting.. nice opportunity for people to experiment with it. I wonder what microcontroller it is. I guess it is doing stuff like pausing for a bit to allow the Pi to shut down gracefully, causing some people to ask why repeatedly pressing the power button does not work, if the MCU is doing its pause, and preventing a restart until the Pi has fully shut down.. (just speculating what the implementation might be doing).

I don't own a desktop-pi, so cannot be sure, but judging by photos it might be an ST STM8S005K6:

http://uk.farnell.com/stmicroelectronics/stm8s005k6t6c/mcu-8bit-stm8-16mhz-lqfp-32/dp/2070944?ost=STM8S005K6&iscrfnonsku=false&ddkey=http%3Aen-GB%2FElement14_United_Kingdom%2Fsearch

I don't own a desktop-pi, so cannot be sure, but judging by photos it might be an ST STM8S005K6:

http://uk.farnell.com/stmicroelectronics/stm8s005k6t6c/mcu-8bit-stm8-16mhz-lqfp-32/dp/2070944?ost=STM8S005K6&iscrfnonsku=false&ddkey=http%3Aen-GB%2FElement14_United_Kingdom%2Fsearch