[Guide] Graceful shutdown switch without Pololu [RETIRED]

[KrxXxiT]

@KrxXxiT All I'll be doing is releasing a modified version of Popcorn's script for each of my shutdown boards. The videos and everything else will remain the same.

Still, a modified version will work, the current one doesn't. Man I'm looking forward to this, it's the last part I need to complete my build.

[Camble]

@KrxXxiT Sorry! I could have sworn I added steps on how to modify Popcorn's script.

Make the following changes:

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25. GPIO.setup(powerGPIO, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

[RxBrad]

So, I reformatted and reimaged the SD card that had the Retropie 4.0.2 install go bad last night. Made it through the first boot and was able to install Popcorn's power monitor, and modify the THREE lines of code. Reboot the Pi, and it's stuck at the splash screen. So I think that SD may have truly died(??)

Pull out SD card #2 that has RetroPie 3.8.1 already installed and all the changes we knew about as of last night. Made the 2 additional changes we just found out about on Popcorn's power monitor this morning. Put this on a Pi with Camble's recommended circuit from yesterday. The Pi boots, and then immediately issues a shutdown command.

Is there maybe another power monitor script change we need, besides those 3 lines????

Also, when @myPiZero apparently had this exact same issue a couple pages back, he mentioned that he mounted the SD to a Windows PC to disable the startup script. How does one do that?

[Camble]

@RxBrad Try only modifying the first line of code. Sorry, I'm not at home right now so I can't confirm. I can confirm however, that the version of the script I have running at home works flawlessly.

This was already in my guide before, but when the guide was changed to reflect only needing one circuit diagram, I must have pulled something out unintentionally.

[myPiZero]

@RxBrad I used a freeware by paragon
paragon
I would disable the option to turn off during boot. If the shutdown signal is active during boot, for safety reasons, disable the graceful shutdown feature.

[RxBrad]

Any chance this need to be changed also, on line 96? Maybe from GPIO.FALLING to GPIO.RISING (sorry, I know nothing about Python), since the power GPIO was modified from pullup to pulldown?

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GPIO.add_event_detect(powerGPIO, GPIO.FALLING, callback=powerSwitch, bouncetime=300)

[Camble]

@RxBrad Nope.

[Camble]

Alright, just change the first line. I was getting mixed up between the two versions of the script (the BangGood version of my board requires yet more changes to the script).

[RxBrad]

@Camble Back to the drawing board, I guess.. I'll just keep waiting for the Vishay FET.

Any chance you could post your working Powerboost script somewhere in its entirety? Thanks..

[Camble]

Any chance you could post your working Powerboost script somewhere in its entirety? Thanks..

It's identical except for that one line. It's the BangGood version that has a few more changes.

Your Layout #02 should work with that one change to the script.