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by davidcoton
Thu Dec 12, 2019 4:29 pm
Forum: Beginners
Topic: Connecting 5V pullup to Pi GPIO
Replies: 33
Views: 919

Re: Connecting 5V pullup to Pi GPIO

Milliways wrote:
Thu Dec 12, 2019 2:48 am
The real problem is the 100MΩ resistors they inserted in my brain in ICU.
Is that on the inputs or the outputs?
by davidcoton
Wed Dec 11, 2019 11:20 pm
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 181
Views: 5621

Re: Tatami Pi Fun.

If you write your code in Rust, then abandon it for a year or two, does it go Rusty? I think Kira and Fido should borrow the Turbo Encabulator to investigate. Should Heater, having begun to adopt Rust, be renamed Mr Rusty? Should Zebedee investigate that, or is Rust a threat to his thRust? Maybe we ...
by davidcoton
Wed Dec 11, 2019 5:51 pm
Forum: General discussion
Topic: Watermark Desktop Wallpapers with IP addresses
Replies: 19
Views: 620

Re: Watermark Desktop Wallpapers

So, you don't want to watermark the wallpaper (a one-off operation that could identify the OS installation), you want a live display of the name and IP of the current data? Actually, even that is dependent on software settings, not the base hardware, and will move with the SDCard or other root files...
by davidcoton
Wed Dec 11, 2019 5:44 pm
Forum: General discussion
Topic: Enabling and performing fast hand-off in rpi 3b+ as a client
Replies: 8
Views: 431

Re: Enabling and performing fast hand-off in rpi 3b+ as a client

Let me clarify my previous post.
Adding any external antenna to the Pi3B+ built-in WiFi and Bluetooth will invalidate its FCC, CE, or equivalent certification.
by davidcoton
Wed Dec 11, 2019 4:41 pm
Forum: General discussion
Topic: Enabling and performing fast hand-off in rpi 3b+ as a client
Replies: 8
Views: 431

Re: Enabling and performing fast hand-off in rpi 3b+ as a client

Just wanted to post, high gain antenna solved my fast hand off issues. You are aware, of course, that adding a high gain antenna to a Pi3B+ will invalidate its FCC, CE, or equivalent certification in (almost?) every country? In the worst case, you will get an unpleasant visit from the men in black.
by davidcoton
Wed Dec 11, 2019 1:51 pm
Forum: General discussion
Topic: [Solved] Annoying feature of 'apt-get uprgade'
Replies: 42
Views: 1122

Re: Annoying feature of 'apt-get uprgade'

If apt does overwrite the file without asking, then I am definitely not going to use it ever again. I realise that is a Debian issue, not a Raspbian one, but overwriting config files (if that is the case) without asking is just not acceptable. I'll stick with apt-get, which is proven and has worked...
by davidcoton
Mon Dec 09, 2019 9:38 pm
Forum: General discussion
Topic: Pi 4 a cautionary tale
Replies: 14
Views: 748

Re: Pi 4 a cautionary tale

HawaiianPi, Yea, don't do that either (even once). Well, it was an interesting, shall we say 'experiment'. The first time I inadvertently applied 12v to a Pi smoke came out and a protection diode unsoldered itself and jumped off the board. I realized my mistake pretty quickly and shut it down. Amaz...
by davidcoton
Mon Dec 09, 2019 8:02 pm
Forum: General discussion
Topic: How does the Raspberry Pi work?
Replies: 17
Views: 483

Re: How does the Raspberry Pi work?

youngdawg wrote:
Mon Dec 09, 2019 5:55 pm
How does the Raspberry Pi work?
01000110 01100001 01110011 01110100
by davidcoton
Mon Dec 09, 2019 3:16 pm
Forum: General discussion
Topic: HDMI audio doesn't work
Replies: 3
Views: 138

Re: HDMI audio doesn't work

yabusa wrote:
Mon Dec 09, 2019 12:05 am
... there's no audio from my monitor.
Does your monitor have speakers? Many don't.
by davidcoton
Sun Dec 08, 2019 11:11 pm
Forum: Beginners
Topic: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?
Replies: 15
Views: 440

Re: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?

emma1997 wrote:
Sun Dec 08, 2019 10:47 pm
No such thing as perfect short or open on this planet.
Superconductivity?
by davidcoton
Sun Dec 08, 2019 10:43 pm
Forum: Advanced users
Topic: Pi4: Setting up SSD already for future USB boot
Replies: 5
Views: 397

Re: Pi4: Setting up SSD already for future USB boot

dschorfhaar wrote:
Sun Dec 08, 2019 8:29 pm
Step 2: Enable USB boot mode...
This thread is about the Pi4. Your tip is for Pi3B (not 3B+) and later Pi2B only.
by davidcoton
Sun Dec 08, 2019 10:37 pm
Forum: Beginners
Topic: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?
Replies: 15
Views: 440

Re: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?

My understanding is there can be no current w/o voltage and versa vice. There can be current without voltage, but only with zero resistance. There can be voltage without current, but only at infinite resistance. The above is only strictly valid for DC conditions. For AC (or alternating voltage), re...
by davidcoton
Sun Dec 08, 2019 10:28 pm
Forum: General discussion
Topic: RPI4 - No Audio from Headphone Jack
Replies: 5
Views: 152

Re: RPI4 - No Audio from Headphone Jack

hi ear buds may not work due to the pin outs of the connector good luck crofter The pin outs are carefully designed to add the video out while retaining stereo audio compatibility. The problem with pin out is only relevant with AV leads, where there are at least three different conflicting standard...
by davidcoton
Sun Dec 08, 2019 11:45 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 10
Views: 251

Re: Device not detected using i2c-detect y 1

Check Joan's idea first. Unplug everything except the cobbler from the breakout board. Check the voltages (pins 1, 2, 4, 6 etc) with reference to the metal shell of one of the Pi's connectors (USB, HDMI, etc). Get that right before reconnecting and testing anything else (if it is wrong, connecting t...
by davidcoton
Sat Dec 07, 2019 10:55 am
Forum: General discussion
Topic: RPi4 do not boot from SSD after upgrade to last firmware?
Replies: 7
Views: 463

Re: RPi4 do not boot from SSD after upgrade to last firmware?

Does the 2GHz overclock work with the FS on an SDCard?

Did you use rpi-update? If so, see this thread and particularly this post.
by davidcoton
Fri Dec 06, 2019 10:58 pm
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 181
Views: 5621

Re: Tatami Pi Fun.

According to the head of marketing and communications, Orson is first on the list of potential reviewers for the Beginners All-purpose RISC Komputer. While waiting for the BARK to go into production, maybe he could write an article for the MagPi. Fido has numerous relatives in and around my home vi...
by davidcoton
Thu Dec 05, 2019 10:24 pm
Forum: General discussion
Topic: Raspberry pi 4 power with out power adapter??
Replies: 6
Views: 342

Re: Raspberry pi 4 power with out power adapter??

A polyfuse is not a diode and would not protect against reverse polarity. Of course not. The polyfuse protects the TVS diode that IS still present on the Pi4. So on older (not Zero) models, fault conditions trigger the TVS diode to conduct, which draws maximum current from the PSU, thus tripping th...
by davidcoton
Thu Dec 05, 2019 10:08 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 not working.
Replies: 11
Views: 359

Re: Raspberry Pi 4 not working.

Thanks for help, Raspberry Pi 4 Is working normally but the HDMI out put just too week and Raspbain is have some error like When i add memory for GPU, it restarting, i know it know it ok. But when Reboot complete, both of USB 2.0 and 3.0 output is not working!. Don't add memory for GPU on a Pi4. Ma...
by davidcoton
Thu Dec 05, 2019 9:07 pm
Forum: General discussion
Topic: New Pi 4B v1.2?
Replies: 172
Views: 11824

Re: New Pi 4B v1.2?

cakeslob wrote:
Thu Dec 05, 2019 1:07 am
I dont know enough about whats going on to fake it, so here are some hardware pics ...
The pictures appear to be the 1.2 revision. What is the revision from Dougie's recipe above?
by davidcoton
Thu Dec 05, 2019 9:02 pm
Forum: General discussion
Topic: Raspberry pi 4 power with out power adapter??
Replies: 6
Views: 342

Re: Raspberry pi 4 power with out power adapter??

I am assuming you are using a step down converter? Whatever the power source, you must deliver 5V (+/-0.25V) to the Pi. Depending on what is connected to it, a Pi4B may require up to 3A (15W). So some checks: Does the printer's PSU (at whatever voltage) have a spare 15W capacity? If the printer sup...
by davidcoton
Wed Dec 04, 2019 10:18 pm
Forum: Troubleshooting
Topic: Pi 4 B Will not boot, no green LED [Solved]
Replies: 8
Views: 203

Re: Pi 4 B Will not boot, no green LED

... am I supposed to somehow close a thread when it has been solved? You can close the thread by editing your OP and adding "[Solved]" to the title. It won't prevent further posts, but should indicate that there is no outstanding issue. (If you feel it should be locked, report your own post and ask...
by davidcoton
Wed Dec 04, 2019 8:44 pm
Forum: Off topic discussion
Topic: Does this forum have a 'dark' mode ?
Replies: 23
Views: 1028

Re: Does this forum have a 'dark' mode ?

avensis18 wrote:
Wed Dec 04, 2019 2:17 pm
it would be nice to be able to adjust the forum to use white on black
Personally I want pink ponies and rainbow unicorns round the edge. Not. :twisted:
by davidcoton
Wed Dec 04, 2019 8:38 pm
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 181
Views: 5621

Re: Tatami Pi Fun.

Heater wrote:
Wed Dec 04, 2019 7:52 pm
... the Personal Computer Winter closed in with the arrival of Windows.
Personally I recommend closing Windows with the arrival of winter. :roll:
by davidcoton
Wed Dec 04, 2019 8:11 pm
Forum: Troubleshooting
Topic: Using common x11 apps like xclock on raspberry pi
Replies: 4
Views: 108

Re: Using common x11 apps like xclock on raspberry pi

Just noticed that when I put sudo apt-get install x11-apps it shows Package x11-apps is not available . Don't use apt-get, it is intended for scripting and may fail under some conditions. Use apt instead, it is more likely to ask you for help if there is an issue it can't resolve. So, in this case:...
by davidcoton
Wed Dec 04, 2019 9:45 am
Forum: General discussion
Topic: Custom Raspberry Pi 3b+ Prototype
Replies: 4
Views: 240

Re: Custom Raspberry Pi 3b+ Prototype

You can't. The base design is not public.
Element14 (as one of the companies that can commission production of Pi) offer a custom design service, if your order is big enough.

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