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by paulv
Sun Jul 10, 2016 7:08 pm
Forum: Beginners
Topic: Powerboost 1000, lipo charger, and usb power
Replies: 5
Views: 1752

Re: Powerboost 1000, lipo charger, and usb power

If you would have used the search feature in the upper right hand corner of this screen, (search for powerboost) you would have found several posts dealing with the Powerboost and the RPi. As a mimimum, it would have given you more information. Have a look here for a complete solution that may give ...
by paulv
Tue Jun 28, 2016 8:44 am
Forum: Advanced users
Topic: Controlling the Power Consumption of RPi Models
Replies: 9
Views: 13129

Re: Controlling the Power Consumption of RPi Models

Hi bensimmo, Yes, you can turn off the HDMI plug. sudo /opt/vc/bin/tvservice –o (or –p to turn it back on) However that saves less than 10mA, but that may depend on the monitor and keyboard that is connected. I measured the power requirements of my Dell monitor (1703FPs) connected to the HDMI interf...
by paulv
Tue Jun 28, 2016 7:23 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

A rather shameless plug for a "product" that claims something new? Look at this earlier post for a power supply that already uses a hardware watchdog : https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=50470&start=25 This was posted in August 2013. I came up with this part of the design myself...
by paulv
Tue Jun 28, 2016 6:35 am
Forum: Advanced users
Topic: Controlling the Power Consumption of RPi Models
Replies: 9
Views: 13129

Re: Controlling the Power Consumption of RPi Models

GeekMike, Thank you for the plug to your product, but the link in my post already describes such a system for the DIY inclined forum users, and it is free of any patent issues. In case you overlooked it, you can also use the "on-board" watchdog the SOC on the RPi, and in combination with the supply ...
by paulv
Mon Jun 27, 2016 9:46 am
Forum: Troubleshooting
Topic: Scaling Governor not working on Model 1 A/B A+/B+?
Replies: 0
Views: 298

Scaling Governor not working on Model 1 A/B A+/B+?

I have been working on another post to shed some more light on the power savings that can be obtained to wedge a Model 2B or 3B into a restricted power budget. Here is that post for information : https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=152692 I also wanted to do some analysis on my M...
by paulv
Sun Jun 26, 2016 12:51 pm
Forum: Advanced users
Topic: Controlling the Power Consumption of RPi Models
Replies: 9
Views: 13129

Controlling the Power Consumption of RPi Models

When you need to run your RPi Model 2 or 3 on a battery or a cell for a period of time, the power consumption becomes an important element. The same is true if you don’t have a wall wart that can supply the energy needed for your RPi. (when you get the dreaded rainbow box on your display) With the a...
by paulv
Tue Jun 21, 2016 4:32 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Hey Medicdude, Thank you for posting what seems like a warning. Unfortunately I do not fully comprehend what you are trying to convey. For the sake of the readers of this post and myself, can you please substantiate (point to an article or reference) or otherwise explain why you think it is in-appro...
by paulv
Fri Jun 17, 2016 7:14 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Hi Gordon(77),

Heat yes, but no smoke. (;-))
The Powerboost is well protected against overheating and even a short.
The cells I use have built-in protection against over- and under-voltage and a short as well.
I'm still "green" using Li-ion and Li-poly cells, but I think I'm safe...

Cheers!
by paulv
Thu Jun 16, 2016 6:00 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Here is a graph of the efficiency of the Powerboost conversion from cell energy (I*V) to output energy(I*V) with increasing load:
18650 efficiency.gif
18650 efficiency.gif (7.15 KiB) Viewed 13233 times
!Enjoy
by paulv
Thu Jun 16, 2016 3:09 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

And I have some more information, actually some more bad news for power hungry RPi's... I wanted to measure how well the cell can support the Powerboost output at various current levels, to test the UPS functionality. In this case, there is no power supplied to the main input of the Powerboost. To m...
by paulv
Thu Jun 16, 2016 12:58 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Here are some more details of my actual measurements of the Powerboost package. I already measured that the maximum current the Powerboost can supply to the RPi payload is 1.0Amps continuously, and that the cell is used to temporarily boost that current to 1.2Amps. To make the following analysis, I ...
by paulv
Thu Jun 16, 2016 6:00 am
Forum: Automation, sensing and robotics
Topic: RPi Power Supply w. UPS, one button control
Replies: 10
Views: 10429

Re: RPi Power Supply w. UPS, one button control

redm0nk,

Have a look here for a complete (embedded) solution where an RPi is at a remote location using a Powerboost:
viewtopic.php?f=37&t=150358

Enjoy!
by paulv
Wed Jun 15, 2016 8:30 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Some more observations and some proposed changes to the Adafruit Powerboost 1000c. After I modified the maximum charge current to about 450mA, I did another charge analysis on one of my 18650 2400mAh cells, just to see the effect. Here is the resulting graph: 18650 Charge2.gif The effect of the modi...
by paulv
Mon Jun 13, 2016 8:11 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

While still learning about Li-Ion and Lipo cells, I put a little circuit together with an ADC that let me plot the voltage and the current level over time. Here is a resulting graph of the charging of my tiny 043040 Lipo cell: 043040 Charge.gif As you can see, the peak charging current is about 630m...
by paulv
Wed Jun 08, 2016 8:06 pm
Forum: Automation, sensing and robotics
Topic: Add an analog output to the Pi (DAC)
Replies: 15
Views: 17306

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

I really can't help you, but if you compare the 5683 data sheet with that of the 4911 and the 4921 and then follow the comments in the example code, you should be able to figure this out. It's really not that difficult, and assuming you have the chip, you can try things out until it works. Alternati...
by paulv
Tue Jun 07, 2016 8:01 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Re: Raspberry Pi UPS with Auto Restart

Hi Moe, Yes you can use a Python script to set the port high (I indeed use GPIO-22, can be any general purpose port that does not have a real pull-up by default), and rely on the power-down to reset that pin back to float (if you use GPIO.cleanup()) or pulled low when the RPi gets powerless. Keep in...
by paulv
Sat Jun 04, 2016 4:25 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi UPS with Auto Restart
Replies: 20
Views: 13964

Raspberry Pi UPS with Auto Restart

This post describes a method to equip a Raspberry Pi with features that will allow it to be used autonomously, or in remote locations, in embedded applications (no console or keyboard), and for applications that need to be up and running 24x7 like web servers, file servers, security camera’s, thermo...
by paulv
Fri Jun 03, 2016 1:08 pm
Forum: Automation, sensing and robotics
Topic: RPi Power Supply w. UPS, one button control
Replies: 10
Views: 10429

Re: RPi Power Supply w. UPS, one button control

Thank you for that info.
I'll keep that in mind and update the Forum post.
I have several model 1 B's and one A I use for most (embedded) applications, and only just got model 3 for general computing things.

Please consider writing about your experience with the Amazon thingy!

Enjoy!
by paulv
Fri Jun 03, 2016 7:28 am
Forum: Automation, sensing and robotics
Topic: RPi Power Supply w. UPS, one button control
Replies: 10
Views: 10429

Re: RPi Power Supply w. UPS, one button control

Hi CynicOdys, First of all, I think you need to verify that an RPi uses 2Amp minimum . In my experience, they seldom do, because it depends on what it is doing. Only if you run your core(s) flat out, that may be the case. Then there are the USB peripherals to take into account. According to the info...
by paulv
Sun May 29, 2016 8:00 pm
Forum: General discussion
Topic: Heatsink question
Replies: 15
Views: 4948

Re: Heatsink question

Interesting discussion. A very long time ago, (in RPi terms) I designed a PWM driven fan for the Model (1) B, that really didn't need it, but it may help with the model 3. It's fairly simple and can be changed easily. Please note that the installation I described is outdated by now, but the applicat...
by paulv
Sun May 29, 2016 7:34 pm
Forum: Troubleshooting
Topic: Prevent shutdown until script finished
Replies: 9
Views: 3107

Re: Prevent shutdown until script finished

I have been experimenting with systemd recently as well. With one of my tests, working with the systemd watchdog feature, I also wanted to catch the signals that systemd sends to my application, a small Python script I used for testing. In my case, it works as expected. Systemd sends the SIGTERM sig...
by paulv
Wed May 18, 2016 7:55 pm
Forum: Advanced users
Topic: (Is this) The correct ways to install the watchdog package?
Replies: 46
Views: 60229

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

I have not received any comments or replies to this post, nor on a request on stackoverflow. http://stackoverflow.com/questions/37144547/setup-issues-using-the-hw-watchdog-with-systemd I filed a bug report hoping that will lead to a solution or clarification. https://bugs.launchpad.net/raspbian/+bug...
by paulv
Fri May 13, 2016 2:25 pm
Forum: Advanced users
Topic: (Is this) The correct ways to install the watchdog package?
Replies: 46
Views: 60229

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

If you want to use the systemd method of using a software watchdog to add control to your own application program, you can use the following method to implement that. As I showed in the first post, you use the hardware BMC watchdog system to reboot the RPi when the kernel gets unresponsive, or when ...
by paulv
Fri May 13, 2016 7:59 am
Forum: Advanced users
Topic: (Is this) The correct ways to install the watchdog package?
Replies: 46
Views: 60229

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

This is a follow-up to the first post.

This post has been made irrelevant by updates
by paulv
Fri May 13, 2016 6:17 am
Forum: Advanced users
Topic: STICKY: HOWTO: Move the filesystem to a USB stick/Drive
Replies: 339
Views: 517874

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

Thank you chris, I have added this to the script.

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