Power on issue

[craic]

Power on issue

[craic]

Not sure what to say about the MCP3008 Analog Digital Converter - the best approach is to wire up a circuit using it aside form the Pi Power circuit/code and verify that it does/does not work correctly... interference in breadboard circuits can be a problem - keep your leads short, keep it away from monitors or any other potential source of interference

As regards the immediate shutdown, this might be a result of changes in the latest raspi-config

You are following the Pi3 version of the description, right ?

Unfortunately that tool does not seem to list a version number... it has changed twice in recent history (over the last 6 months)

So make sure you have the latest version of the Command Line Tool (not the GUI version)
'sudo raspi-config' -> #8 Update ...
In the latest version go #5 Interfacing Options -> P6 Serial -> and then...
Would you like a login shell to be accessible over serial? NO
Would you like the serial port hardware to be enabled? YES
-> OK -> Finish ... then reboot and see if that solves the issue

The prior version only had one option and I suspect this might be part of the problem.

I'll try and update the software on my pi_power test circuit and then test it out myself - but unfortunately it will be a few days before I can get to this...

Let me know how it works...

[cwilliams85]

No luck on this end so far. I can't wait for it to be something stupid (always is).

I did the update, and resetup the interfacing options, still no luck. Also, yes, its wired as per your diagram for the pi3.

[cwilliams85]

I was messing around with various setups and managed to boot it with a usb cable (although not even close to a way that should be reproduced...)

Anyways, during the boot up process my eye caught a line "[FAILED] Failed to start Configure Bluetooth Modems connected by UART." Confusing because I don't have anything bluetooth connected, think that might be part of my aches?

I also noticed that the voltage drops from the battery voltage to the just after the switch. In my current case 3.87v to around 1.52v. When I disconnect the resistor going to ground it goes back to the proper voltage. Not entirely sure if this is intended or not.

[craic]

On Sun, Mar 5, 2017 at 5:02 PM, cwilliams85 ***@***.***> wrote: I was messing around with various setups and managed to boot it with a usb cable (although not even close to a way that should be reproduced...)

Hmm... does that imply that you were NOT powering it with a USB cable before? You weren't trying to wire directly into the Pi 5V pin, were you? That might cause various issues as I THINK that bypasses power control circuitry on the Pi board...

Anyways, during the boot up process my eye caught a line "[FAILED] Failed to start Configure Bluetooth Modems connected by UART." Confusing because I don't have anything bluetooth connected, think that might be part of my aches?

I don't think so...

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[cwilliams85]

Interesting. Unfortunately my setup kind of requires it to be through the gpio pins. I'm mashing my RetroPie project into a Wii u gamepad. I might be able to squeeze a USB cable in there, but I'm fairly sure the original project I'm basing my on went through the gpio pins (and I do know the risk of blowing up the pi from doing this) but I know he used your script and wiring to power the thing.

Here's a link to the project, maybe you see something I don't with the limited amount of information and pictures provided. http://sudomod.com/forum/viewtopic.php?f=13&t=1607

I'm going to reinstall RetroPie tonight and see if that makes a difference. Maybe something else I have is disabling this from working.

And for the sake of completing this, I'll power it through the USB to see if there is an impact.

[craic]

OK - I'll dig into the Pi schematics and see what, if anything you are bypassing

…

On Mon, Mar 6, 2017 at 4:27 PM, cwilliams85 ***@***.***> wrote: Interesting. Unfortunately my setup kind of requires it to be through the gpio pins. I'm mashing my RetroPie project into a Wii u gamepad. I might be able to squeeze a USB cable in there, but I'm fairly sure the original project I'm basing my on went through the gpio pins (and I do know the risk of blowing up the pi from doing this) but I know he used your script and wiring to power the thing. Here's a link to the project, maybe you see something I don't with the limited amount of information and pictures provided. http://sudomod.com/forum/viewtopic.php?f=13&t=1607 I'm going to reinstall RetroPie tonight and see if that makes a difference. Maybe something else I have is disabling this from working. And for the sake of completing this, I'll power it through the USB to see if there is an impact. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#1 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAqOb9rEqhW-cTvlWd3WWrco7rvRSz4ks5rjKRdgaJpZM4MRVPv> .

[cwilliams85]

I believe it's just the poly fuse. Still, not sure of the culprit, but that voltage drop seems suspect.

[cwilliams85]

Partial success, granted only half is wired in. I turned off the second option "serial port hardware" and it'll boot until I stop pressing the momentary switch.

[cwilliams85]

On further examination, having either configuration on the serial option nets the same result. In addition, using a capacitor or not across the en/ground resistor has the same result.

I've also stripped a USB cable, so we can rule that out. Also, I can rule out anything I might have changed software wise. I reflashed my SD card to RetroPie 4.1 and then updated it. I'm probably going to reinstall one more time and not update just for the sake of it.

[cwilliams85]

Well, I reinstalled on 4.1 RetroPie and left the raspi-config tool, disto update, and upgrade alone. Power up works now. Haven't wired the power down portion back in, but I'm hopeful.

Just praying the upgrade doesn't make me miss out on some functionality I want...

[cwilliams85]

As for the battery monitor, I had to use gpio pins 5,6,19,26, gnd. So that works now. I guess we can close this with the solution of "don't upgrade anything and hope for the best.