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by renice123
Mon Sep 21, 2020 5:32 am
Forum: Troubleshooting
Topic: Fried two different RPi 4 - why?
Replies: 30
Views: 852

Re: Bricked two different RPi 4 - why?

To avoid such tragic events, never connect a GPIO device to a microcomputer. At least until you debug your device. It makes no sense to connect something to the Rpi. Microcontrollers are now available with logic for all voltages and they work great with Rpi. Why risk it? But why? Who needs to consta...
by renice123
Sun Sep 20, 2020 6:14 am
Forum: Troubleshooting
Topic: Audio
Replies: 14
Views: 301

Re: Audio

If you want to get pure beautiful sound, you need to purchase an external sound card (DAC) that can work over usb It should be a high-quality card or DAC, and for no Chinese counterfeit for $ 5, and even more so not an hdmi adapter with sound output. It makes no sense to use expensive amplifiers, ac...
by renice123
Fri Sep 18, 2020 8:54 am
Forum: Troubleshooting
Topic: Power led flashing
Replies: 2
Views: 96

Re: Power led flashing

buy a high-quality 5V 3A power supply with a thick and high-quality wire to the computer.
by renice123
Fri Sep 18, 2020 6:33 am
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ Freezes
Replies: 20
Views: 393

Re: Raspberry pi 3 b+ Freezes

Based on top's output, there are two suspects. One of them is openvn. I looked in google for reviews of this program. Request: "openvpn freeze". Results: approximately 996,000 (0.56 sec.) As you can see, the number of complaints is huge. I would turn to the developers forum, since every second perso...
by renice123
Thu Sep 17, 2020 6:45 pm
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ Freezes
Replies: 20
Views: 393

Re: Raspberry pi 3 b+ Freezes

If I understand correctly, does a clean operating system freeze? Problems only start when you install hostapd & stunnel & openvpn? And after a lot of traffic goes through the Rpi, the computer freezes? If you remove these programs, the computer will not freeze? PS For a start, I set the processor fr...
by renice123
Thu Sep 17, 2020 5:54 pm
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ Freezes
Replies: 20
Views: 393

Re: Raspberry pi 3 b+ Freezes

Perhaps it makes sense to lower the processor frequency in config.txt and lower the voltage there. They say that some minicomputers do not work well at the base frequency and it is necessary to lower the frequency and voltage. How does the freeze manifest itself in this case? Mouse, keyboard not wor...
by renice123
Thu Sep 17, 2020 6:25 am
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ Freezes
Replies: 20
Views: 393

Re: Raspberry pi 3 b+ Freezes

Here's a huge Armbian thread here https://github.com/armbian/build/issues/219 A python script was suggested here, the author claims that this script in some cases is able to reproduce the problem of starting kswapd ramhog.py from time import sleep print ('Press ctrl-c to exit; Press enter to hog 100...
by renice123
Wed Sep 16, 2020 7:07 pm
Forum: Troubleshooting
Topic: Mouse pointer disappears
Replies: 5
Views: 108

Re: Mouse pointer disappears

If you are using remmina, then there is nothing strange that your mouse cursor disappears This is a remmina problem, not an Rpi problem Such programs in general have always suffered from some diseases, which is generally normal for this class of programs. Mouse problems were common in remmina https:...
by renice123
Wed Sep 16, 2020 6:46 pm
Forum: Troubleshooting
Topic: Raspberry pi 3 b+ Freezes
Replies: 20
Views: 393

Re: Raspberry pi 3 b+ Freezes

Turn on swap and connect a high-speed external hard drive. This can help. What you are describing looks like an old killer Linux problem, namely the "great kswapd problem" http://www.science.unitn.it/~fiorella/guidelinux/tlk/node39.html This problem cannot be solved in a simple way, if there is litt...
by renice123
Wed Sep 16, 2020 6:19 am
Forum: Troubleshooting
Topic: Cannot get an IPv4 address when I ping Raspberry PI from my Windows PC
Replies: 4
Views: 176

Re: Cannot get an IPv4 address when I ping Raspberry PI from my Windows PC

As long as I remember the manuals of system administrators, in your case, it is recommended to organize the network through MAC addresses. Do not assign static IP addresses on the microcomputers themselves. But you need to connect the Rpi to the router (router) and assign IP addresses on the router,...
by renice123
Tue Sep 15, 2020 5:32 pm
Forum: Troubleshooting
Topic: Mouse pointer disappears
Replies: 5
Views: 108

Re: Mouse pointer disappears

This happens in some cases. Most often this occurs due to the fact that the monitor resolution in X is not configured correctly. What operating system and graphics manager do you have? Also, to test if the mouse is working, it makes sense to run something like this sudo cat /dev/input/mice But I thi...
by renice123
Mon Sep 14, 2020 6:41 pm
Forum: Troubleshooting
Topic: Cannot connect to my RPI as a bluetooth headset unless I restart the bluetooth service
Replies: 17
Views: 558

Re: Cannot connect to my RPI as a bluetooth headset unless I restart the bluetooth service

if you do not want to go through the painful and hopeless path of "connecting a bluetooth microphone to Raspberry", then immediately buy something like Creative - BT-W2 (old version 2.0, now it is more profitable to buy with support for bluetooth 4 or even five)). You can read more here http://moode...
by renice123
Mon Sep 14, 2020 5:04 pm
Forum: Troubleshooting
Topic: 3B+ stopped booting
Replies: 7
Views: 223

Re: 3B+ stopped booting

If you have nothing connected, then it makes sense to make changes to config.txt (see below). Then there is no need to turn off the monitor. After loading the OS, the green LED should stop blinking quickly and chaotically. You need to reduce the load on the power supply, this can also be done by cha...
by renice123
Mon Sep 14, 2020 4:39 pm
Forum: Troubleshooting
Topic: Warning DC/DC converters with variable output
Replies: 9
Views: 317

Re: Warning DC/DC converters with variable output

You have chosen a Chinese dc dc converter, and it works in critical mode for you. We (in our small community in the city) have tested these Chinese converters many times and each time we made sure that all these converters are done on the knee in the basement of a distant city. The quality of the pr...
by renice123
Mon Sep 14, 2020 4:19 pm
Forum: Troubleshooting
Topic: 3B+ stopped booting
Replies: 7
Views: 223

Re: 3B+ stopped booting

what devices are connected to the computer? Perhaps it makes sense to disconnect all devices, up to the monitor, mouse, keyboard and try to boot (watch the LED blinking). Insufficient supply voltage sometimes leads to this behavior. Judging by your measurements, your power is supplied from a charger...
by renice123
Mon Sep 14, 2020 3:00 pm
Forum: Troubleshooting
Topic: Raspivid preview distorted
Replies: 6
Views: 144

Re: Raspivid preview distorted

It seems to me too that your display is not properly configured I have an 800x480 display, and when I connect it with the required configuration in config.txt, the raspberry picture does not overlap the image. If I connect with incorrect settings in config.txt, then the same problem arises as yours....
by renice123
Mon Sep 14, 2020 9:47 am
Forum: Troubleshooting
Topic: UPDATE: Can't watch youtube on fresh system
Replies: 15
Views: 388

Re: Can't watch youtube on fresh system

As far as I can tell, the Chromium browser often works almost bypassing the OS =) So the Linux graphics setup might work fine, but the browser will be buggy. It seems strange, but I think it was done to speed up the browser (considering features including ThreadX) I don't know how relevant all these...
by renice123
Mon Sep 14, 2020 6:23 am
Forum: Troubleshooting
Topic: UPDATE: Can't watch youtube on fresh system
Replies: 15
Views: 388

Re: Can't watch youtube on fresh system

You should most likely change your video settings in config.txt. Including pay attention to kms and other "fashionable things" Rpi has some video problems, but I think you made a mistake somewhere. It seems to me that in this case you should turn off all external devices: turn off external hard driv...
by renice123
Sat Sep 12, 2020 10:31 am
Forum: Troubleshooting
Topic: Receiving 433 Mhz signal...
Replies: 23
Views: 624

Re: Receiving 433 Mhz signal...

I can only say my opinion, because I had no experience with Chinese transceivers for Arduino (I write programs for teensy, since these controllers are more convenient for my purposes). Also, I mainly used "expensive" radio solutions, because they are available to me - in particular, these are radio ...
by renice123
Fri Sep 11, 2020 1:46 pm
Forum: Troubleshooting
Topic: Receiving 433 Mhz signal...
Replies: 23
Views: 624

Re: Receiving 433 Mhz signal...

If you are not a programmer, then solving the problem can be extremely difficult for you. Firstly, there are difficulties with the equipment. However, it is easy to solve the problem if you have the skills to work with soldering irons and electronic circuits - you can connect a call through an optoc...
by renice123
Fri Sep 11, 2020 6:45 am
Forum: Troubleshooting
Topic: Raspberry PI4 very short Bluetooth range, increasing trasmit power?
Replies: 5
Views: 1074

Re: Raspberry PI4 very short Bluetooth range, increasing trasmit power?

It is necessary to clarify which bluetooth protocol is used. And what are the settings for your bluetooth transceiver. The bluez package contains several utilities that allow you to evaluate the level of the input and output signals (and also change), but without knowledge of the bluetooth protocol,...
by renice123
Sat Sep 05, 2020 7:17 pm
Forum: Troubleshooting
Topic: Bluetooth headphones have extremely low quality
Replies: 2
Views: 96

Re: Bluetooth headphones have extremely low quality

the bluetooth microphone is the sore spot of the RPI. While setting up sound to your speakers is easy enough, setting up sound through a microphone can be tricky. Since the most popular program for this does not work correctly on RPI. Pulseaudio is "buggy" and this sound server is not recommended to...
by renice123
Sat Sep 05, 2020 7:03 pm
Forum: Troubleshooting
Topic: Is there a Pi 4 Undervoltage warning?
Replies: 24
Views: 2026

Re: Is there a Pi 4 Undervoltage warning?

I also get a low power warning if the voltage drops too much (yellow lightning bolt icon). But this only happens if I feed the RPI4 through a long wire - voltage drops on it if there is a large load. I have a 10A power supply with an ideal specification, so I know the culprit is the power cable. Whe...
by renice123
Sat Sep 05, 2020 6:53 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4b ssh connection closed
Replies: 4
Views: 164

Re: Raspberry Pi 4b ssh connection closed

seems to be an old problem, try the following in settings
UseDNS no
MaxStartups 100: 100: 1000
http://bxr.su/OpenBSD/usr.bin/ssh/sshd.c#895
by renice123
Sat Sep 05, 2020 1:06 pm
Forum: Troubleshooting
Topic: [SOLVED] Bluetooth controller disconnects constantly - Rpi 4 - Recent update
Replies: 5
Views: 207

Re: Bluetooth controller disconnects constantly - Rpi 4 - Recent update

Unfortunately, I am currently on an Intel computer, so I can only give you some advice from memory. When I had such a mess (yes-no-yes-no), I did only one thing - deleted the old connection from the settings. But you can check the connection step by step. We look at wireless interfaces sudo rfkill L...

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