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by renice123
Sun Sep 26, 2021 2:05 pm
Forum: Advanced users
Topic: raspberry pi 3b+ lowering power consumption to absolute minimum
Replies: 8
Views: 819

Re: raspberry pi 3b+ lowering power consumption to absolute minimum

It is interesting! Thank you cleverca22. I also tried to play with the "distribution" of tasks on the cores, but it seems that I will have to study the documentation. In "theory" it would be possible to load processes to a particular kernel (I did this to optimize work with sound...
by renice123
Sun Sep 26, 2021 1:24 pm
Forum: Advanced users
Topic: raspberry pi 3b+ lowering power consumption to absolute minimum
Replies: 8
Views: 819

Re: raspberry pi 3b+ lowering power consumption to absolute minimum

However, returning to lower power consumption. Today I took a look at how well the processor tuning utilities work. Wow! Great result! cat /sys/devices/system/cpu/cpu0/cpufreq/ scaling_available_governors Therefore, we can change the processor operating modes from "efficient" to "ener...
by renice123
Sun Sep 26, 2021 7:52 am
Forum: Beginners
Topic: text messages from Pi to android phones or iPhones
Replies: 9
Views: 3374

Re: text messages from Pi to android phones or iPhones

If you want to send messages from your computer to your cellular phone, there are electronic modules on sale. These modules are controlled by AT commands via rs232, like ordinary old "modems".
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by renice123
Fri Sep 24, 2021 5:48 am
Forum: Advanced users
Topic: raspberry pi 3b+ lowering power consumption to absolute minimum
Replies: 8
Views: 819

Re: raspberry pi 3b+ lowering power consumption to absolute minimum

Well, if we are talking about a real reduction in power consumption, then you will also have to choose a memory card. Different memory cards consume current in different ways, as well as in read or write modes. You can reduce power consumption by giving up frequent recording to the memory card and c...
by renice123
Tue Sep 21, 2021 1:35 pm
Forum: Advanced users
Topic: raspberry pi 3b+ lowering power consumption to absolute minimum
Replies: 8
Views: 819

Re: raspberry pi 3b+ lowering power consumption to absolute minimum

In addition to the well-known ways to reduce power consumption (like giving up crazy "default services" and turning off hdmi output), I think the most effective solution is to use Rpi 3A + This RPi version clearly outperforms the "regular" third version in terms of power consumpt...
by renice123
Mon Aug 30, 2021 4:08 am
Forum: Troubleshooting
Topic: High IOwait makes raspberry pi server unavailable
Replies: 4
Views: 428

Re: High IOwait makes raspberry pi server unavailable

atop – run it with -d option or press d to toggle the disk stats view. iostat – try it with the -xm 2 options for extended statistics, in megabytes, and in two-second intervals. iotop – top-like I/O monitor. Try it with the -oPa options to show the accumulated I/O of active processes only. ps – use ...
by renice123
Fri Aug 27, 2021 12:15 pm
Forum: C/C++
Topic: Definitive BLE guide(BlueZ) and gatt-server implementation
Replies: 18
Views: 2375

Re: Definitive BLE guide(BlueZ) and gatt-server implementation

In general cases, you can always find "documentation" on Bluez - firstly, there is doc-man, and secondly, the source code is really not so difficult to write (the developers have provided a huge number of already written functions, they can be combined for your own purposes). BLE is also s...
by renice123
Wed Aug 25, 2021 6:33 am
Forum: Beginners
Topic: Sharing Ground with another device
Replies: 4
Views: 276

Re: Sharing Ground with another device

I wouldn't do that for security reasons. In your case, it makes sense to connect usb a microcontroller (arduino, teensy) to Raspberry and connect to the video switch via the microcontroller pins. If the microcontroller burns out, it will be easier to replace it than buying a new microcomputer =)
by renice123
Wed Aug 25, 2021 6:06 am
Forum: Beginners
Topic: OS on USB vs OS on SDCard
Replies: 5
Views: 338

Re: OS on USB vs OS on SDCard

I think the answer is obvious - it's about controllers and architecture. An SD card, as a rule, uses a very weak controller (which is not able to cache data, but immediately dumps it to the card), in addition, the card's read-write resource is very small. In an SSD disk, the controller first caches ...
by renice123
Wed Aug 25, 2021 5:29 am
Forum: General discussion
Topic: RPi4B 8GB: Should I put a heatsink on the ethernet controller or on the PMIC?
Replies: 28
Views: 2251

Re: RPi4B 8GB: Should I put a heatsink on the ethernet controller or on the PMIC?

I put a heatsink on the processor and noticed that the PMIC was also "cooled". It is obvious that the power microcircuit is soldered to the motherboard and "gives off heat" through it. In other words, if you "cool" the processor (take heat from the motherboard), then th...
by renice123
Tue Aug 24, 2021 7:12 pm
Forum: Beginners
Topic: How to prioritize SSID ?
Replies: 4
Views: 262

Re: How to prioritize SSID ?

I think you should only set the priority as a positive number =) Also, there are still some ways to make sure that only the devices you need are connected. As far as I remember, this can be done even using the "strength" of the wifi signal. Among other things, it is quite possible to "...
by renice123
Tue Aug 24, 2021 7:01 pm
Forum: Beginners
Topic: Help : Need to Remote control a Computer connected to Rasberry Pi
Replies: 9
Views: 474

Re: Help : Need to Remote control a Computer connected to Rasberry Pi

Did I understand correctly that you want to connect the Raspberry to a VGA monitor? If so, the answer is yes - it can be done through an HDMI >> VGA adapter. Also, there is nothing difficult to control the mouse over the network. This is done with the help of programs, for example, these are http://...
by renice123
Tue Aug 24, 2021 6:38 pm
Forum: Troubleshooting
Topic: Raspberry pi zero ssh issue
Replies: 3
Views: 199

Re: Raspberry pi zero ssh issue

You don't just need to ping Raspberry, but see which ports are open. This is done using, for example, the nmap command https://nmap.org/ This program will show if you have an open ssh port (usually 22)
by renice123
Tue Aug 24, 2021 6:31 pm
Forum: Troubleshooting
Topic: Pi uses as Access point but no internet on it
Replies: 9
Views: 436

Re: Pi uses as Access point but no internet on it

The other day I set up an access point according to official documents, everything works flawlessly. However, if you do not have an Internet connection, then most likely you forgot to register the routing rules, configure masquerading, or you have "your own" settings that conflict with the...
by renice123
Tue Aug 24, 2021 6:24 pm
Forum: Русский
Topic: Стабилизатор напряжения для Pi4
Replies: 1
Views: 1725

Re: Стабилизатор напряжения для Pi4

Возможно, это слишком поздний ответ, но все же... На мой взгляд, лучшие стабилизаторы-конвертеры для Малины это Мюрата или Line age https://www.murata.com/en-global/products/power/nonisolated-dc-dc-converter Китайские же "преобразователи" это часто нестабильные и некачественные устройства ...
by renice123
Tue Aug 24, 2021 1:43 pm
Forum: Advanced users
Topic: SSH over bluetooth (PAN)
Replies: 0
Views: 410

SSH over bluetooth (PAN)

SSH over bluetooth. Raised the PAN network. But how to properly configure security? I would be grateful for your advice. This time, I needed to organize access to the ssh server on the Raspberry Pi Zero W, as well as the Rpi 3A + via bluetooth. I started looking for ready-made solutions on the forum...
by renice123
Sun Jun 20, 2021 6:23 pm
Forum: Troubleshooting
Topic: Chromium is slow on a Raspberry Pi 4
Replies: 32
Views: 11618

Re: Chromium is slow on a Raspberry Pi 4

Try disabling hardware acceleration. It can be disabled both in the browser itself and in config.txt. Perhaps this is an old hardware acceleration error. She is a hundred years old and cannot do anything with her =)
by renice123
Mon Jun 07, 2021 4:30 pm
Forum: Troubleshooting
Topic: How do I stop PCMANFM from using too much CPU
Replies: 22
Views: 1364

Re: How do I stop PCMANFM from using too much CPU

I don't think you can do anything. I ran into this same problem a few years ago and was unable to do anything. I even started to correspond with other affected people (Google will give you the answer). Alas, this is just a very clumsy program, hardcoded into the graphical shell. You cannot remove it...
by renice123
Sun May 30, 2021 6:43 pm
Forum: Advanced users
Topic: How to connect to a Raspberry over a very long distance without using the internet?
Replies: 27
Views: 2435

Re: How to connect to a Raspberry over a very long distance without using the internet?

If your computers are located well (so that there are no obstacles between computers that are not visible to radio waves), then you can use industrial Wi-Fi points. They work great and are able to solve your problems with ease. All other solutions will be much more complicated and require special an...
by renice123
Thu Apr 15, 2021 11:49 am
Forum: Graphics, sound and multimedia
Topic: Raspberry Pi 4 and JACK Server
Replies: 7
Views: 1438

Re: Raspberry Pi 4 and JACK Server

I've used jackd with and without pulseaudio. Better to work without pulseaudio - this program still crashes on all architectures. On Malin it is very convenient to abandon all drivers and install the driver for an "empty" snd-aloop card. This will leave the entire system working, redirect ...
by renice123
Thu Apr 15, 2021 5:51 am
Forum: General discussion
Topic: Turn-off GPS Module when doesn't need
Replies: 6
Views: 478

Re: Turn-off GPS Module when doesn't need

U-blox module control supports two formats. You can configure support from programming U-center (under Windows). https://www.u-blox.com/en/product/u-center I am using standard format send and receive data so I don't use u-blox binary format. In this case, you can send a command to the input of the m...
by renice123
Thu Apr 15, 2021 5:36 am
Forum: Beginners
Topic: using scapy to scan bluetooth data?
Replies: 2
Views: 260

Re: using scapy to scan bluetooth data?

Yes, you can, but with some reservations. For example, consider the laws of your country, because in some countries, network scanning can be considered hacking and lead to prosecution. You can legally use the standard scan programs from the bluez package. This default package contains almost all the...
by renice123
Thu Apr 15, 2021 5:18 am
Forum: Troubleshooting
Topic: Changing battery and SD cards
Replies: 5
Views: 259

Re: Changing battery and SD cards

Several years ago I was making photo traps for cameras and came to the conclusion that I should use something like Teensy microcontrollers for programming. At that time, teensy were the most powerful and could work with light and color sensors for a long time and without interruption (I also made a ...
by renice123
Wed Apr 14, 2021 5:45 am
Forum: Troubleshooting
Topic: Using Bluetooth speaker on rPi3 command line
Replies: 4
Views: 358

Re: Using Bluetooth speaker on rPi3 command line

|I work a lot and often in the command shell, moreover, I prefer to configure everything CLI. Based on my experience, I can say that sometimes it is more profitable, easier, more convenient to use hardware than software. Bluetooth in Malin is not bad, but there are software difficulties, so I prefer...
by renice123
Wed Apr 14, 2021 5:26 am
Forum: Troubleshooting
Topic: just seeing text then a black screen with a little blinking line on the top
Replies: 7
Views: 348

Re: just seeing text then a black screen with a little blinking line on the top

If you see a blinking cursor on the display, then most likely you are in the command shell =) Do I understand correctly that you have no practical experience with Linux? If this is the CLI (command shell) mode, then most likely your graphical shell will not start. I think this should be checked in r...

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