Go to advanced search

by paulv
Tue Oct 03, 2017 2:45 pm
Forum: Advanced users
Topic: Is this the correct way to install the watchdog package?
Replies: 32
Views: 25154

Re: Is this the correct way to install the watchdog package?

For those of you that still experience a not automatically rebooting RPi after a kernel crash, I happened to find a possible solution that probably came about in a later kernel version. Try this: sudo nano /etc/sysctl.conf And add the following : Kernel.panic=10 This will set the automatic reboot af...
by paulv
Mon Sep 11, 2017 8:11 am
Forum: Advanced users
Topic: Designing a single cell UPS for the power hungry RPi's
Replies: 0
Views: 244

Designing a single cell UPS for the power hungry RPi's

A friend and I set out on a quest to design a UPS for the RPi that really worked for higher power applications. Most designs, even the ones I have listed on this Forum myself, suffer from a lack of true output power for the more power hungry RPi Models, like the Model 3, or when there are enough dev...
by paulv
Sat Jul 22, 2017 6:54 pm
Forum: Advanced users
Topic: Is this the correct way to install the watchdog package?
Replies: 32
Views: 25154

Re: Is this the correct way to install the watchdog package?

Thank you for the tips Michael!

I submitted the same report to both suggested github locations.
Maybe we'll get a response this time.

Regards,

Paul
by paulv
Sun Jun 04, 2017 6:57 pm
Forum: Advanced users
Topic: Is this the correct way to install the watchdog package?
Replies: 32
Views: 25154

Re: Is this the correct way to install the watchdog package?

Hi brunohpg, Thanks for taking the time to report your findings. I can concur with your systemd findings, mine are exactly the same. Something got broken somewhere, and it seems the watchdog package still works. I hope a fix can be found and communicated. Let me point out to others reading this post...
by paulv
Fri May 26, 2017 2:55 pm
Forum: Automation, sensing and robotics
Topic: HOW-TO Build an Automatic Power Supply for the Pi
Replies: 39
Views: 21463

Re: HOW-TO Build an Automatic Power Supply for the Pi

Hi jaiz.mate, The ground connections to the convertor are what they are. It depends on what version you use, so don't take the pin numbers for granted. In any case, in these little convertors, the input ground is connected to the output ground. One connection to ground will do. Check with a DMM in t...
by paulv
Fri May 26, 2017 2:44 pm
Forum: Automation, sensing and robotics
Topic: Add an analog output to the Pi (DAC)
Replies: 13
Views: 8632

Re: Add an analog output to the Pi (DAC)

In the previous post I mentioned that I have a project with the MCP4921, the 12-bit version DAC. I put together a small script that allows you to input the digital bit code through the console. Here is that Python script: #!/usr/bin/python #-----------------------------------------------------------...
by paulv
Fri May 26, 2017 10:06 am
Forum: Automation, sensing and robotics
Topic: HOW-TO Build an Automatic Power Supply for the Pi
Replies: 39
Views: 21463

Re: HOW-TO Build an Automatic Power Supply for the Pi

Hi jaiz.mate,

No you can't! Have a look at the two datasheets and in particular look at the VGS Threshold specifications and also the RDSon.

If you want to use a replacement, look for a Logic Level MOSFET. They are designed to be driven by a voltage in the 0..5V range.

Success!
by paulv
Fri May 26, 2017 9:56 am
Forum: Automation, sensing and robotics
Topic: Add an analog output to the Pi (DAC)
Replies: 13
Views: 8632

Re: Add an analog output to the Pi (DAC)

Hi Alexander, Can you please verify that you have gone through the following steps without errors reported?: sudo apt-get install python-setuptools -y sudo apt-get install python-dev -y sudo apt-get install git -y # if installed previously : sudo rm -R py-spidev git clone git://github.com/doceme/py-...
by paulv
Thu May 25, 2017 11:17 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 314
Views: 331533

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

Hi there, If I want to boot from a USB with a RPi3, how would the process change? If you look at the very first post, there is a note about booting directly from a disk for the RPi Model 3. It's still not main-stream, but seems to work reliably for many users. Just follow the link to get to the inf...
by paulv
Wed May 24, 2017 11:58 am
Forum: Automation, sensing and robotics
Topic: HOW-TO Build an Automatic Power Supply for the Pi
Replies: 39
Views: 21463

Re: HOW-TO Build an Automatic Power Supply for the Pi

Thank you!
You can of course use whatever you want, but it's hard to beat the LM317 for price, simplicity and overall real estate as a solution.
by paulv
Sat May 20, 2017 10:39 am
Forum: Automation, sensing and robotics
Topic: Halt-Restart with 1 Button
Replies: 5
Views: 4806

Re: Halt-Restart with 1 Button

Hi Ben, you can use just about any free GPIO pin, although I recommend to stay away from the special ones.
Just give it a try, you won't cause any problems, as long as you don't short pins together while soldering.
by paulv
Fri May 19, 2017 3:10 pm
Forum: Advanced users
Topic: Is this the correct way to install the watchdog package?
Replies: 32
Views: 25154

Re: Is this the correct way to install the watchdog package?

As was almost to be expected, the description I wrote above no longer works. The proverbial goal posts have been move once again by the powers in the tower. Is there anybody that can shed some light on this obscure procedure? A few pointers. The hardware watchdog devices are now always listed, regar...
by paulv
Sun May 07, 2017 6:21 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 2252

Re: Raspberry Pi power cut torture test using a MoPower UPS

+1 Depending on what you want to prove, or investigate, you should indeed add writing to the SD card. That is the critical operation, not reading. There have been some significant improvements made in both the hardware, kernel drivers and SoC firmware over the last couple of years, with the addition...
by paulv
Sun Apr 30, 2017 8:23 am
Forum: Other projects
Topic: New mini UPS hat for our Raspberry Pi
Replies: 10
Views: 1109

Re: New mini UPS hat for our Raspberry Pi

A simple solution for a restart after a mains return can be found here:
viewtopic.php?uid=52264&f=37&t=150358&start=0

No extra controller needed, simple, reliable and inexpensive.

Enjoy!
by paulv
Thu Apr 27, 2017 7:30 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 314
Views: 331533

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

I have updated the header of the original post somewhat to bring it more in line with the UUID vs /dev/sd* changes for the filesystem identifiers, now that the Foundation changed to the more robust method since the 2017-04-10 version. I also updated the link to the Model 3 description for booting fr...
by paulv
Wed Apr 26, 2017 1:45 pm
Forum: Other projects
Topic: New mini UPS hat for our Raspberry Pi
Replies: 10
Views: 1109

Re: New mini UPS hat for our Raspberry Pi

Francisco, Have a look here : https://flashcandy.us/products/5v-3a-ups-for-raspberry-pi-beagleboard-arduino They have used the same booster chip as you do. From what I can gather, this is a power supply with a UPS function "only". The power can't be turned off and the RPi will not get restarted auto...
by paulv
Tue Apr 25, 2017 8:05 pm
Forum: Other projects
Topic: New mini UPS hat for our Raspberry Pi
Replies: 10
Views: 1109

Re: New mini UPS hat for our Raspberry Pi

Hi Francisco, Nice job, there will be a market for it, I'm sure. I have some experience designing UPS supplies for the RPI family, most of them are actually published on this forum. The biggest hurdle is to create a booster circuit that will supply 2 Amps or more (for the Model 3), with a cell volta...
by paulv
Sat Apr 15, 2017 1:24 pm
Forum: General discussion
Topic: Python IDE
Replies: 17
Views: 47375

Re: Python IDE

I have been using PyScipter (version 2.6.0.0 x86) on my WPC in combination with Samba and PuTTY on the RPi for several years now. It is a full blown IDE and well integrated with Windows. I always run my RPi's headless and use PuTTY. Because PyScripter is fully integrated with Python on the PC, you c...
by paulv
Wed Mar 29, 2017 11:55 am
Forum: Advanced users
Topic: HOWTO: create an SD image to use as a master?
Replies: 10
Views: 899

Re: HOWTO: create an SD image to use as a master?

Good point FM81, In that case, I can see two options that can be used. 1. Delete some bloatware before installing Gimp. Things that come to mind are wolfram-engine, games like scratch minecraft-pi, penguinspuzzle, sonic-pi, dillo, gpicview, oracle-java8-jdk, openjdk-7-jre, oracle-java7-jdk, openjdk-...
by paulv
Wed Mar 29, 2017 7:56 am
Forum: Advanced users
Topic: HOWTO: create an SD image to use as a master?
Replies: 10
Views: 899

Re: HOWTO: create an SD image to use as a master?

When a new SD card is loaded with a new version of the OS, /boot/cmdline.txt contains a command to execute a script on the very first boot of this SD card. It expands the filesystem to use all space on the SD card, then removes itself from the cmdline file. This automatic method was added to help pr...
by paulv
Wed Mar 29, 2017 6:37 am
Forum: Advanced users
Topic: Wake from halt
Replies: 67
Views: 47609

Re: Wake from halt

The method described in the following post provides a simple one-button start-stop solution.
viewtopic.php?f=37&t=140994&p=1120289#p1120289
by paulv
Mon Mar 20, 2017 8:09 am
Forum: Automation, sensing and robotics
Topic: Add an analog output to the Pi (DAC)
Replies: 13
Views: 8632

Re: Add an analog output to the Pi (DAC)

Good point kosaku, I overlooked that additional change and it proves once again that you need to test your code...
Thanks for contributing!
by paulv
Thu Mar 09, 2017 10:41 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 314
Views: 331533

Re: HOWTO: Move the filesystem to a USB stick/Drive [updated

I just updated/upgraded to 4.4.50+ #970, and when running raspi-config, there is indeed nothing yet about the new booting from other devices than the SD card in there. Still not "main-stream".
by paulv
Tue Mar 07, 2017 8:56 am
Forum: Raspbian
Topic: [solved] Latest Kernel & Firmware broke my RPi 3
Replies: 17
Views: 1986

Re: [solved] Latest Kernel & Firmware broke my RPi 3

gkreidel, thank you, I just took the warning away from the original post. Dougie, I also highlighted the RPI Model 3 procedure as being different, to mke it stand out more, but at this moment, the following link is still the only reference I have : https://github.com/raspberrypi/documentation/blob/m...
by paulv
Tue Mar 07, 2017 8:49 am
Forum: Raspbian
Topic: [solved] Latest Kernel & Firmware broke my RPi 3
Replies: 17
Views: 1986

Re: Latest Kernel & Firmware broke my RPi 3

gkreidl,
So can we take the warning away again?
Maybe you can edit/delete you post with the big red warning? ;)

Go to advanced search