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by qwertymodo
Fri Jul 10, 2020 2:58 am
Forum: Troubleshooting
Topic: Unable to power cycle using a mains switch
Replies: 6
Views: 291

Re: Unable to power cycle using a mains switch

Hmm... I'm starting to suspect this particular mains switch might be making the cardinal sin of being wired on the neutral instead of the hot, allowing some phantom voltage to still be present on the USB plug. Some rewiring may be in order.
by qwertymodo
Tue Jul 07, 2020 3:41 am
Forum: Troubleshooting
Topic: Unable to power cycle using a mains switch
Replies: 6
Views: 291

Re: Unable to power cycle using a mains switch

Whenever possible I'm also shutting down cleanly first, so I'm not worried about that part. I'm worried about the fact that if power is lost, I have no way of bringing the system back up without physical access, which is a serious problem. I even just tried it with the mains power completely physica...
by qwertymodo
Tue Jul 07, 2020 12:45 am
Forum: Troubleshooting
Topic: Unable to power cycle using a mains switch
Replies: 6
Views: 291

Unable to power cycle using a mains switch

I'm trying to set up my Pi as part of an integrated system, where it may be necessary to power cycle the entire system, including the Pi. I was planning on doing this with a network-controlled PDU that can turn individual power sockets on and off. However, it seems that when I do this, the Pi never ...
by qwertymodo
Fri Apr 08, 2016 11:36 pm
Forum: General discussion
Topic: Micro-SD on Raspberry Pi 3
Replies: 18
Views: 6823

Re: Micro-SD on Raspberry Pi 3

Man, I understand the design change, but as a user with a case where the SD card fits flush to the case edge (to prevent the accidental ejects, and also because it's just a lot cleaner that way), this change really annoys me. I'm gonna have to trash my case in order to access the SD card, or else di...
by qwertymodo
Sun May 10, 2015 12:37 am
Forum: HATs and other add-ons
Topic: 3G dongle carrier compatibility
Replies: 0
Views: 358

3G dongle carrier compatibility

I'm looking for a 3G dongle to use for a project at work. The main issue is that my work currently has a contract with U.S. Cellular, and it seems like almost all (if not all, some I can't find info on) of the supported dongles are GSM, and I need CDMA. Are there any known working dongles that work ...
by qwertymodo
Tue Jan 29, 2013 10:36 pm
Forum: Graphics, sound and multimedia
Topic: MIDI Project
Replies: 1
Views: 1040

MIDI Project

I'm working on a project to basically take input from a USB HID input and convert it to MIDI output. I've seen a lot of people building GPIO serial<->MIDI interfaces, but I've heard it requires a ton of CPU cycles to pull it off. Would a USB MIDI interface be better suited for this task? My ideal se...
by qwertymodo
Tue Jan 29, 2013 3:18 am
Forum: Troubleshooting
Topic: ACPI Shutdown
Replies: 4
Views: 5698

Re: ACPI Shutdown

Ok, so then 2 questions: First of all, how does the motherboard turn off the power supply? Does the power-on line on the ATX supply also control the 4-second-hold hard shutdown behavior? And second, is there any way to trigger a clean, ACPI-like shutdown with a GPIO interrupt? I've seen conflicting ...
by qwertymodo
Sun Jan 27, 2013 3:34 am
Forum: Beginners
Topic: Logitech Wireless Touch Keyboard K400: Does it work for you?
Replies: 97
Views: 127130

Re: Logitech Wireless Touch Keyboard K400: Does it work for

Raspbian Wheezy. KB and trackpad both work, but I have to replug every reboot.
by qwertymodo
Sat Jan 26, 2013 10:49 pm
Forum: Troubleshooting
Topic: ACPI Shutdown
Replies: 4
Views: 5698

Re: ACPI Shutdown

I seem to have posted in the wrong browser tab, resulting in posting in the wrong sub-forum... sorry about that. :oops: Any chance of moving this to a more appropriate sub-forum?
by qwertymodo
Sat Jan 26, 2013 10:47 pm
Forum: Troubleshooting
Topic: ACPI Shutdown
Replies: 4
Views: 5698

ACPI Shutdown

I'm building a project inside a rack-mount server chassis, powering the Pi as well as other peripheral hardware using the internal ATX power supply. I'm wondering if it's possible to wire up the Pi to do a proper ACPI shutdown the way a PC would (press the chassis power button, clean shutdown, hold ...
by qwertymodo
Sat Jan 26, 2013 2:08 am
Forum: Beginners
Topic: ATX Power Supply for RPi
Replies: 10
Views: 3884

Re: ATX Power Supply for RPi

I'm building a project inside of a rack mount server chassis, which already has the ATX power supply. For this project, the ATX PSU is definitely the best option.
by qwertymodo
Fri Jan 25, 2013 10:36 pm
Forum: Beginners
Topic: ATX Power Supply for RPi
Replies: 10
Views: 3884

Re: ATX Power Supply for RPi

Hmm, ok. I'll have to look into it some more. I definitely need the live rails, because I will be needing the 12V rail as well, since I need a 9V source for a piezo contact mic preamp (12V rail -> 7809). I'll definitely use that breakout board as a reference, but I'm already building a board, so I m...
by qwertymodo
Fri Jan 25, 2013 7:42 pm
Forum: Beginners
Topic: ATX Power Supply for RPi
Replies: 10
Views: 3884

Re: ATX Power Supply for RPi

I would think that a PC power supply would be pretty consistent with its voltage levels... according to the specs on the product page, the PSU I have can source 5V@12A, so at least power consumption isn't going to be an issue :roll: If nothing else, I'm already going to be constructing a simple PCB ...
by qwertymodo
Fri Jan 25, 2013 6:43 pm
Forum: Beginners
Topic: ATX Power Supply for RPi
Replies: 10
Views: 3884

ATX Power Supply for RPi

Is it possible to use the 5V rail from a typical PC ATX power supply to power the RPi? Are there any concerns I should take into consideration if I want to power it this way?

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