Pi Desktop - control power by button

Hi all

I have Raspberry Pi3. I want buy Pi Desktop and connect it with RPI3 and add mSata hard disk SSD. I use it for home automation application. But i have a problem becuase Pi Desktop has own POWER BUTTON. And one problem which i have before buy is that after lost POWER all RPI3+Pi Desktop no start automaticaly when POWER come back. I must click on POWER BUTTON.

Is any chance to configure this to when power lost and when power lost RPI3 worsk , and then when power come back to RPI3 + Pi Desktop start automaticaly ?

Rpi3 without Pi desktop start automatical but power adapter is connected to RPI3 but when use with Pi Desktop powerd adapter is connected to Pi Desktop(and power is transport also to RPI3 by GPIO or USB)

I need have auto start rpi3+pi desktop because it is use for home automation and when it not start auto , when power lost and come back my home automation control stop working. But when i am away home i can not power On it by button.

Please help me.

shabaz over 7 years ago in reply to pepeel

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.
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gadget.iom over 7 years ago in reply to pepeel

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.
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gadget.iom over 7 years ago in reply to shabaz

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.
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shabaz over 7 years ago in reply to gadget.iom

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).
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gadget.iom over 7 years ago in reply to shabaz

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
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pepeel over 7 years ago

But reprogramm is very hard...
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jgcobra over 7 years ago

Here's a fully working on-off push button solution for Raspberry Pi 3:
https://grahamwhome.wixsite.com/tetchytechie/single-post/2018/01/10/A-working-Raspberry-Pi-3-power-button
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gadget.iom over 7 years ago in reply to jgcobra

Hi jgcobra

Welcome to the element14 community.
Unfortunately I don't think he's after a power button at all for his application but would rather it works continuously on power-up.
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jgcobra over 7 years ago in reply to gadget.iom

Thanks. Apologies but I think I replied to the wrong post. I will find the one I meant to reply to!
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gadget.iom over 7 years ago in reply to jgcobra

No Worries.
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