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by dustnbone
Fri Jun 05, 2020 2:57 am
Forum: Troubleshooting
Topic: kernel disconnecting all usb devices if usb 3 ports are used
Replies: 3
Views: 63

Re: kernel disconnecting all usb devices if usb 3 ports are used

Don't forget the 1.2A hard limit on USB power, shared across all ports. Exceeding this will not cause an undervoltage warning on the Pi, it will reset the entire USB bus. I'm not sure how or if it wlil recover from this state once loads are removed, it's possible it would require all USB devices to ...
by dustnbone
Mon May 25, 2020 2:18 pm
Forum: Automation, sensing and robotics
Topic: Gravity fed irrigation for a grow tent.
Replies: 9
Views: 271

Re: Gravity fed irrigation for a grow tent.

Don't forget that 2.31 feet of head = 1 PSI, so you're not dealing with NO pressure at the valve inlet, and you can increase the pressure by raising the source higher above the valve. Most solenoid valves will work fine with 2 PSI or 4.6 feet of head. Also if you can avoid it you want to keep your f...
by dustnbone
Wed May 20, 2020 11:02 am
Forum: Troubleshooting
Topic: Pi0 SSH problem
Replies: 5
Views: 147

Re: Pi0 SSH problem

Sounds like an IP addressing problem. Is your Pi assigned a static IP address? Either in your router via DHCP reservation (recommended) or by configuring the Pi itself to use a specfic IP address instead of getting one assigned from the router by DHCP. Otherwise you may get a different IP every time...
by dustnbone
Wed May 20, 2020 10:55 am
Forum: Media centres
Topic: External 3.5" hdd enclosure power consumption
Replies: 3
Views: 224

Re: External 3.5" hdd enclosure power consumption

Very unlikely it pulls max rated power from the supply, let alone continuously. Spinning drives will draw peak power during spinup, then considerably less once they're spun up (cuz rotational inertia). Typical 3.5" drives draw 6-10W during operation, but can briefly peak over 25W while they spin up.
by dustnbone
Wed May 20, 2020 1:30 am
Forum: Gaming
Topic: Endless Sky on the Pi4B (4G)
Replies: 6
Views: 458

Re: Endless Sky on the Pi4B (4G)

The GPU on the Pi4 doesn't support OpenGL 3, unless there's a way to compile the game to use GLES 3 or OpenGL 2.1 you might not be able to run it on the Pi.
by dustnbone
Tue May 19, 2020 3:43 pm
Forum: Advanced users
Topic: 160 Watt 4 ohm speaker with pi zero
Replies: 20
Views: 658

Re: 160 Watt 4 ohm speaker with pi zero

If audio quality isn't a major concern, you can just connect an amplifier directly to the A/V output (the little 3.5mm headphone type jack). If your goal is quality sound, a DAC of some sort is probably a good idea as the audio output on the Pi is not stellar. The amplifier doesn't need to be anythi...
by dustnbone
Tue May 19, 2020 6:07 am
Forum: Beginners
Topic: Upgrade from Command Terminal to GUI Without ReInstall
Replies: 2
Views: 89

Re: Upgrade from Command Terminal to GUI Without ReInstall

You should be able to just install raspberrypi-ui-mods and in the process of satisfying dependencies for that package, apt should install everything else missing from Lite and present in Desktop.

Code: Select all

sudo apt install raspberrypi-ui-mods
by dustnbone
Sun May 17, 2020 8:04 pm
Forum: Troubleshooting
Topic: PI won't recognaize new (fresh ) SD card?
Replies: 14
Views: 355

Re: PI won't recognaize new (fresh ) SD card?

Sounds like a display issue to me. The only constants I see here are the HDMI cable and display. Are the lights on the Pi flashing to indicate activity while it's booting? The working card could have some HDMI settings in it's config.txt that are making it see the display, while the freshly written ...
by dustnbone
Sat May 16, 2020 7:45 pm
Forum: General discussion
Topic: Multiple Pis from a single power supply
Replies: 10
Views: 395

Re: Multiple Pis from a single power supply

I use one of these to power Pis I'm working with on my desk, as well as general USB powering/charging duty. It's never had any trouble in terms of undervoltage warnings on the Pi, etc and seems to do what it says on the box (makes 50W of USB power without melting). It's limited to 2.4A per port but ...
by dustnbone
Sat May 16, 2020 3:43 am
Forum: Troubleshooting
Topic: SD Card Appears to have Worn Out
Replies: 3
Views: 116

Re: SD Card Appears to have Worn Out

SSDs also tend to have better wear leveling. They're also available in (more expensive) versions that are better suited to the type of workload you're dealing with. There are possibly also things you could do in your database configuration that would mitigate some of the write behavior that's causin...
by dustnbone
Fri May 15, 2020 9:37 pm
Forum: Troubleshooting
Topic: Pis power supply specific/selective ?
Replies: 29
Views: 658

Re: Pis power supply specific/selective ?

All PSUs does provide 5V and from what i can measure both Pi1 and Zero W draws about 200mA. You need to measure the voltage where it enters the Pi, and under load. Voltage drops occur across lengths of thin wire, across bad connections, etc. It can also occur as a result of a poorly regulated power...
by dustnbone
Mon May 11, 2020 10:25 pm
Forum: Networking and servers
Topic: Access Pi using Mac Finder
Replies: 1
Views: 116

Re: Access Pi using Mac Finder

You might need to set a samba password for the user account you're trying to access the share as. It's separate from the login password, and I'm not sure there's one set by default for the Pi user. The command to do this is smbpasswd https://www.samba.org/samba/docs/current/man-html/smbpasswd.8.html
by dustnbone
Sat May 09, 2020 6:04 pm
Forum: Advanced users
Topic: Pi4 running on 12V battery
Replies: 6
Views: 350

Re: Pi4 running on 12V battery

Assuming some kind of buck converter (the car cigarette USB adapter), generally those will continue to output full voltage until input voltage drops below a certain threshold ,typically around 110 to 120% of output voltage, though an automotive specific one like yours possibly cuts off sooner to pre...
by dustnbone
Sat May 09, 2020 9:11 am
Forum: HATs and other add-ons
Topic: Powering USB AMP/DAC from
Replies: 2
Views: 211

Re: Powering USB AMP/DAC from

Sorry for the late reply, just noticed no one responded to you. It should be fine really, it's unlikely that the amount of power something like that can pull is going to exceed the Pis ability. In all likelihood it's drawing under 500mA, which is the original spec for USB device power. I run a Fiio ...
by dustnbone
Fri May 08, 2020 4:03 am
Forum: Beginners
Topic: No mouse
Replies: 10
Views: 285

Re: No mouse

It looks like there are 2 mouse (or mouse looking) devices there. Does your keyboard have a trackpad or something similar on it?
by dustnbone
Fri May 08, 2020 3:49 am
Forum: Beginners
Topic: SD card is dead. (broken in two)
Replies: 10
Views: 414

Re: SD card is dead.

Pretty sure the last thing he did was break the SD card into several pieces :) Only time something similar happened to me was when I had a bare Pi board in a travel bag with the SD card still in it. One of the ones with the spring loaded card holder, it popped out while in the bag and when I pulled ...
by dustnbone
Fri May 08, 2020 3:44 am
Forum: HATs and other add-ons
Topic: Best way to get many voltage divider circuits for DIY BMS
Replies: 11
Views: 395

Re: Best way to get many voltage divider circuits for DIY BMS

1/4 watt should be more than fine, the ADC should only be pulling on the order of microamps to get it's reading.
by dustnbone
Fri May 08, 2020 3:29 am
Forum: HATs and other add-ons
Topic: Best way to get many voltage divider circuits for DIY BMS
Replies: 11
Views: 395

Re: Best way to get many voltage divider circuits for DIY BMS

Aren't buck converters regulated? As in they output the same voltage regardless of input voltage, until the input voltage drops below a certain point. I think you want a voltage divider, it doesn't need to be very big because the current involved is nearly zero. LiFePo4 cells range from about 3.65V ...
by dustnbone
Mon May 04, 2020 6:23 am
Forum: Beginners
Topic: SSD
Replies: 2
Views: 139

Re: SSD

https://blog.adafruit.com/2020/02/28/bo ... pberry_pi/

You still need an SD card to boot the kernel for now.
by dustnbone
Mon May 04, 2020 6:19 am
Forum: General discussion
Topic: Slow transfer speed with Raspberry Pi? Router issue (Solved)
Replies: 19
Views: 788

Re: Raspberry slow as a snail?

ntfs-3g seems to hit the CPU pretty hard when writing to NTFS filesystems. Avoid if possible.
by dustnbone
Mon Apr 27, 2020 10:13 am
Forum: HATs and other add-ons
Topic: Does the Pi Foundation's PoE HAT support data transfer via ethernet as well?
Replies: 3
Views: 203

Re: Does the Pi Foundation's PoE HAT support data transfer via ethernet as well?

Yes this functionality is part of the PoE specification, matter of fact it's the entire purpose of PoE.

There should be fairly little difference among the different PoE HATs, they all do the same thing and that thing isn't very complicated.
by dustnbone
Mon Apr 27, 2020 10:02 am
Forum: General discussion
Topic: Tiny Low Power Speaker For Raspberry Pi?
Replies: 18
Views: 906

Re: Tiny Low Power Speaker For Raspberry Pi?

Power rating for a speaker means how much power it can handle without being damaged, the actual amount of power delivered to it is a function of the amplifier driving it. The amplifier will always consume more power than it outputs to the speaker, as no amplfier is 100% efficient, but some class D (...
by dustnbone
Sat Apr 25, 2020 10:01 am
Forum: General discussion
Topic: Pi setup using phone only
Replies: 5
Views: 255

Re: Pi setup using phone only

Yes very much possible to do with SSH, and VNC as well if you wanted. I've set up Pis with only my phone (that has a MicroSD slot), using it to download and write the image to the SD card, add the ssh file to the boot partition and add the wifi info for the phones hotspot. Setup Wifi Hotspot on Andr...
by dustnbone
Fri Apr 24, 2020 1:43 am
Forum: Teaching and learning resources
Topic: how to destroy your pi.....remove Python!
Replies: 21
Views: 1095

Re: how to destroy your pi.....

I'd imagine Debian (on which Raspbian is based) uses a number of python scripts at boot time, to do various things. It makes sense because Python works very well at doing various things. I still don't get why it's a particularly bad thing, a Linux distribution is by definition a collection of softwa...
by dustnbone
Thu Apr 23, 2020 8:55 pm
Forum: Teaching and learning resources
Topic: how to destroy your pi.....remove Python!
Replies: 21
Views: 1095

Re: how to destroy your pi.....

Why would you remove Python from a modern Linux distro?

Even if it did boot good luck getting anything done with it.

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