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by mahjongg
Thu May 13, 2021 2:08 pm
Forum: Networking and servers
Topic: My Use Case is to use get internet through my Pi with a Pi Hat
Replies: 3
Views: 44

Re: Can I use a pi for wifi on my pc?

split off from hijacked thread, please don't hijack a thread with a completely unrelated question!
by mahjongg
Thu May 13, 2021 1:46 pm
Forum: Troubleshooting
Topic: Electrical interference (?) affecting PI 4 IO pin values
Replies: 4
Views: 99

Re: Electrical interference (?) affecting PI 4 IO pin values

Internal (soft) pullups are very weak, at around 50 Kilo Ohm, and so they are easily overridden by electromagnetic fields, especially if you give the GPIO a long antenna (wire). So first use a much stronger pullup, like 1K5 (1500 Ohm) to 3V3, near to the GPIO. Then to short RF pulses to GND mount a ...
by mahjongg
Tue May 11, 2021 3:12 pm
Forum: Off topic discussion
Topic: how-to : clean display panels ?
Replies: 12
Views: 894

Re: how-to : clean display panels ?

Di-Hydrogen-monoxide better known as H2O :|
by mahjongg
Tue May 11, 2021 3:03 pm
Forum: General discussion
Topic: Desktop Forum
Replies: 32
Views: 1033

Re: Desktop Forum

WONTDO: there is too much fragmentation already, not too long ago the forum administrators did a purge and removed (or rather merged) many in their eyes unnecessary subfora. :ugeek:
by mahjongg
Mon May 10, 2021 12:29 pm
Forum: General
Topic: I can't get a SerLCD display that has 3V3 logic and uses I2C
Replies: 14
Views: 378

Re: I can't get a SerLCD display that has 3V3 logic and uses I2C

well it seems your question is answered, so I expect you won't post a new thread.

I could try to cleanup the thread, but why??? :mrgreen:


all's well that ends well :D
by mahjongg
Sun May 09, 2021 11:58 pm
Forum: General discussion
Topic: run exe file on raspberry pi
Replies: 21
Views: 816

Re: run exe file on raspberry pi

Run a x86 emulator (to emulate the intel CPU)

I suggest running dosbox
by mahjongg
Sun May 09, 2021 12:48 pm
Forum: General discussion
Topic: Really lousy RPI quality and no factory QA
Replies: 41
Views: 1517

Re: Really lousy RPI quality and no factory QA

All raspberry PI's are tested in an automated test rig, and no RPI will leave the factory if it fails any of the tests. So its not true that only a few in a batch are tested, they are ALL tested! I'm not sure ethernet connectivity is included in the test though, but it might, and one ethernet pin n...
by mahjongg
Sun May 09, 2021 12:27 pm
Forum: Beginners
Topic: Can I connect a 12V relay to GPIO directly with separate power supply?
Replies: 14
Views: 354

Re: Can I connect a 12V relay to GPIO directly with separate power supply?

NO, the resulting 12V on a GPIO will instantly destroy your PI, read this:

viewtopic.php?f=91&t=83372&p=1225448#p1225448
by mahjongg
Sat May 08, 2021 12:01 pm
Forum: General
Topic: I can't get a SerLCD display that has 3V3 logic and uses I2C
Replies: 14
Views: 378

Re: I need a Beginner subforum under the Raspberry Pi Pico forum

Yes, this was a split off because it was hijacking with a different topic. Now that is clear I will soon delete this thread, and I suggest that anne posts a new question, so I can delete this one as a (partial) duplicate. If you are still asking for a new pico/beginners forum, then I would not waste...
by mahjongg
Fri May 07, 2021 5:26 pm
Forum: HATs and other add-ons
Topic: Relay board appears to pull inputs high?
Replies: 6
Views: 181

Re: Relay board appears to pull inputs high?

That looks like my relay board. From the schematic I can see why I see the voltage on the wire. Is this a typical wiring for a relay and opto-isolator? Is there a reason it couldn't be wired up so the output of the GPIO pin turns on the opto-isolator? Can the GPIO sink more current than source? Tha...
by mahjongg
Thu May 06, 2021 3:24 pm
Forum: Off topic discussion
Topic: What size screw driver for Philips and bolts do I need?
Replies: 37
Views: 1093

Re: What size screw driver for Philips and bolts do I need?

I see no evidence of snap off points or V-cuts on the RPI's I have See https://www.raspberrypi.org/blog/sony-the-pi-makers-a-post-from-pete-lomas/ for the evidence that has been removed at some point prior to shipping. yes, It was exactly as I was expecting, the sides where no stresses while breaki...
by mahjongg
Tue May 04, 2021 12:09 pm
Forum: Troubleshooting
Topic: Pi 400 will not power on
Replies: 14
Views: 372

Re: Pi 400 will not power on

Try it with the official power supply, and a new 16MB card you image with raspberry PI OS with the RPI imager. Most boot problems come from either power, or "fake" or damaged sd-cards, use the LATEST image! Use The primary HDMI port (HDMI0) turn on your monitor BEFORE booting, and with the...
by mahjongg
Tue May 04, 2021 11:41 am
Forum: Troubleshooting
Topic: Pi 400 will not power on
Replies: 14
Views: 372

Re: Pi 400 will not power on

Read the PI4 section of the boot problem sticky in trouble shooting.
by mahjongg
Mon May 03, 2021 3:30 pm
Forum: General discussion
Topic: Change username?
Replies: 13
Views: 358

Re: Change username?

aerthqwtjh wrote:
Mon May 03, 2021 12:39 pm
No, i can't - thank you anyway...

Kind regards, Jan
You see the column ABOUT US on the bottom of the page?
The last item in the list is Contact us.
Click on that, and fill in your message.

p.s. corrected a small and obvious typo in e-mail address.
by mahjongg
Mon May 03, 2021 3:24 pm
Forum: Java
Topic: UnsupportedClassVersion when compiling on different computer and running on PI
Replies: 8
Views: 340

Re: UnsupportedClassVersion when compiling on different computer and running on PI

Cross-platform use of Java doesn't look like a "beginners" subject, so moving to "java".
by mahjongg
Mon May 03, 2021 11:29 am
Forum: Off topic discussion
Topic: What size screw driver for Philips and bolts do I need?
Replies: 37
Views: 1093

Re: What size screw driver for Philips and bolts do I need?

Not to mention the Pi's are not manufactured one at a time, but in a large pcb sheet and snapped off from each other. may well be, although I see no evidence of snap off points or V-cuts on the RPI's I have, but I can guarantee you that raspberry PI's will be individually tested in a test rig, and ...
by mahjongg
Mon May 03, 2021 11:04 am
Forum: General discussion
Topic: Change username?
Replies: 13
Views: 358

Re: Change username?

Is it possible to change forum username? Thanks for feedback. With kind regards, Jan Not by us lowly moderators, you can pester us all you want, we cannot change usernames. It needs a global database change to do that. You might have better luck contacting the forum masters, by e-mailing info@raspb...
by mahjongg
Mon May 03, 2021 10:54 am
Forum: Other
Topic: Raspberry PI 4 on Windows WIFI ISSUE
Replies: 3
Views: 184

Re: Raspberry PI 4 on Windows WIFI ISSUE

Windows 10 on a Raspberry PI is not supported!

Locking, and moving to "other"
by mahjongg
Sun May 02, 2021 12:01 pm
Forum: Automation, sensing and robotics
Topic: How to detect the phone number which call my fixed line
Replies: 24
Views: 843

Re: How to detect the phone number which call my fixed line

No use continuing this thread. locking
by mahjongg
Sun May 02, 2021 11:14 am
Forum: Automation, sensing and robotics
Topic: How to detect the phone number which call my fixed line
Replies: 24
Views: 843

Re: How to detect the phone number which call my fixed line

userTom58987645 asked for the deletion of hist first post, which is quite a antisocial thing to ask, but I will oblige him technically, but not in spirit, here is his deleted post. I also gave him a ban. Hello, I want to create a little project detect the phone number which call my fixed line and bl...
by mahjongg
Sat May 01, 2021 2:40 pm
Forum: Automation, sensing and robotics
Topic: How to detect the phone number which call my fixed line
Replies: 24
Views: 843

Re: How to detect the phone number which call my fixed line

IMO lightning bolt is almost same category as meteor strike. TVS or GDT not likely to help in either case. By far biggest concern is putting over 5v (or phone voltage 20x higher) into Pi pin. One of the few cases where an opto-isolator might be appropriate. Unlike hobby playaz on internet forums of...
by mahjongg
Sat May 01, 2021 2:28 pm
Forum: Automation, sensing and robotics
Topic: How to detect the phone number which call my fixed line
Replies: 24
Views: 843

Re: How to detect the phone number which call my fixed line

As for differences in telephone systems, it used to be that Dutch, German British and French phone systems were all incompatible, but one of the first things the EU did was to design a line interface that equalised all the different phone line systems, that is if the line is current or voltage drive...
by mahjongg
Fri Apr 30, 2021 1:54 pm
Forum: Troubleshooting
Topic: sudo apt update failed
Replies: 1
Views: 102

Re: sudo apt update failed

Posting this thread because for some reason https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=310265 was removed it was removed because you keep posting duplicates and triplicates of it (the same pos), your original post is here: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t...
by mahjongg
Thu Apr 29, 2021 8:41 pm
Forum: Troubleshooting
Topic: False Undervolatage
Replies: 9
Views: 313

Re: False Undervolatage

If the voltage is indeed dropping to below 4.63 volts, it seems to be momentary. Is there a minimum time the voltage must be below 4.6 volts before the lighting bolt triggers?? Thanks NO! A picosecond will suffice, as a picosecond of absence of power can and will crash a CPU executing instructions ...

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