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by mosespi
Mon May 29, 2017 6:39 pm
Forum: Advanced users
Topic: Power Failure simulation with watchdog
Replies: 13
Views: 1992

Re: Power Failure simulation with watchdog

I have a similar test.. still ongoing. I got to 26,823 successful boot ups for the regular test and it is on # 21,056 for the write test!!! See: https://www.raspberrypi.org/forums/viewtopic.php?t=182519 This was all done using my UPS for the Pi. A supervisor circuit (micro-controller) controls the p...
by mosespi
Mon May 29, 2017 6:17 pm
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

Boot # 21,056 on the second "write while power cut" test!

Regards,
-Moses
by mosespi
Thu May 18, 2017 7:23 pm
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

We are on boot up # 7,580 (!) on the second "write while power cut" test! Still ongoing! Other then 2 failed boot ups, nothing unusually has happened. The activity light is pretty much solid green when the power gets cut. So, what next? Add more capacitance on the 5v line to simulate more of a brown...
by mosespi
Tue May 16, 2017 5:53 am
Forum: Automation, sensing and robotics
Topic: Solar, Infrared Bird House Project
Replies: 2
Views: 949

Re: Solar, Infrared Bird House Project

John, Here is a reference project where the Pi used about 3 watts. It was able to keep running 24/7 on GOOD sun days in Los Angeles. 20 watt solar panel, regular PWM charge controller and a 7Ah lead acid battery. http://www.allspectrum.com/mopower/solar/MoPower-UPS-solar.html I would expect your set...
by mosespi
Tue May 16, 2017 5:44 am
Forum: Other projects
Topic: Sizing a fuse
Replies: 9
Views: 1612

Re: Sizing a fuse

We need to know how much power your HDMI monitor is using. Is this a small screen or something large? Do you know it's specific power usage? I see you are fusing the 5v side.. are you providing this fused 5v to the monitor as well? Everything else is pretty standard.. you can estimate about 250ma fo...
by mosespi
Fri May 12, 2017 4:54 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

The write test failed after 1,084 boot ups! Another SD card boots up in the same hardware just fine. Tried mounting the SD card on another system (not booting) and the root partition seems to be fine. The boot partition on the other hand has trouble.. kept getting the following errors in /var/log/me...
by mosespi
Tue May 09, 2017 4:19 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

An update: Over 1,000 power cuts during a write operation. Still booting up!

Regards,
-Moses
by mosespi
Mon May 08, 2017 7:15 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

I stopped the test, took a snapshot of the logs and a checksum of all files. I will be checking them against a fresh install to check for any corruption. It was still booting up properly! The final successful boot count was 26,823! I now have the same setup but with a deliberate write. I created a 1...
by mosespi
Sun May 07, 2017 7:58 am
Forum: Other projects
Topic: Powering 5inch HDMI display and RPi3 with single 18650
Replies: 7
Views: 1384

Re: Powering 5inch HDMI display and RPi3 with single 18650

Plastygrove,

Saw your video. I'm sure that running all your battery and DC converter connections through that breadboard isn't helping you any. The current carrying capacity of the breadboard traces are in question as is the contact resistance. Take it out.

Regards,
-Moses
by mosespi
Sun May 07, 2017 7:47 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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 additio...
by mosespi
Sun May 07, 2017 7:31 am
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

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

....... A few quick software changes and the UPS can cut power immediately without a proper shutdown!.... I think that most unintended power losses are not immediate or abrupt. When power is removed from the mains as would happen during a power outage, then the power supply continues to output volt...
by mosespi
Sat May 06, 2017 9:24 pm
Forum: General discussion
Topic: Raspberry Pi power cut torture test using a MoPower UPS
Replies: 30
Views: 5982

Raspberry Pi power cut torture test using a MoPower UPS

As some of you remember the prior versions of the Raspberry Pi were a bit sensitive to power cuts, many SD cards were corrupted in the early days of the Pi. What likely made this worse was a lack of good USB power supplies (or the prevalence of really bad ones!). A lot of power supplies don't seem t...
by mosespi
Sat May 06, 2017 7:55 pm
Forum: HATs and other add-ons
Topic: New features for MoPower UPS, beta 0.93, MORSE Code LED!
Replies: 23
Views: 5448

Re: New features for MoPower UPS, beta 0.93, MORSE Code LED!

Hey guys, If you are building electronics that will be wired into the car all the time, you need to consider transient protection... .... Maybe a potential for a MoPower UPS-Auto. ;-) Have fun with your projects! -Spich Hey Spich, Already thought of that one! An automotive qualified TVS (Transient ...
by mosespi
Sat May 06, 2017 7:48 pm
Forum: HATs and other add-ons
Topic: New features for MoPower UPS, beta 0.93, MORSE Code LED!
Replies: 23
Views: 5448

Re: New features for MoPower UPS, beta 0.93, MORSE Code LED!

mosespi, Thank you. I may post a picture of an alligator clip attached before firing it up. I'm not even sure which component I should be bypassing at the moment, but I'll take a look at the manual. I appreciate your offer to upgrade the polyfuse. I'd certainly be willing to pay shipping both ways ...
by mosespi
Thu May 04, 2017 7:39 am
Forum: HATs and other add-ons
Topic: New features for MoPower UPS, beta 0.93, MORSE Code LED!
Replies: 23
Views: 5448

Re: New features for MoPower UPS, beta 0.93, MORSE Code LED!

Ktb, The polyfuse is 1.1A.. so if you are trying to draw 1.4A it will likely trip. I've found a small alligator clip right over the polyfuse is a good temporary bypass, just make sure it is not too big so as not to apply to much pressure and damage the fuse. I may have a production change to a 2A po...
by mosespi
Tue May 02, 2017 6:32 am
Forum: HATs and other add-ons
Topic: New features for MoPower UPS, beta 0.93, MORSE Code LED!
Replies: 23
Views: 5448

Re: New features for MoPower UPS, beta 0.93, MORSE Code LED!

Hi Ktb,

You can try to jumper/bypass/change the polyfuse as a test. I've tested the current Mopower UPS design at 2A with a 50°c temp rise at the regulator. I don't know enough about your other components to know if power would be the problem, so I can't say for certain.

Regards,
-Moses
by mosespi
Sat Apr 22, 2017 9:32 pm
Forum: General discussion
Topic: Need help with headless car radio idea
Replies: 9
Views: 1713

Re: Need help with headless car radio idea

My UPS has design elements suitable for 12v automotive use, it's not *just* a UPS! Can start and shut the Pi down based on if the car is running (alternator output increases bus voltage enough to be detectable). In the off state power usage is less then 1mA, which in my opinion is a good standby ran...
by mosespi
Sat Apr 15, 2017 6:45 pm
Forum: Raspbian
Topic: Raspbian mirror at mirror.os6.org down?
Replies: 4
Views: 1307

Re: Raspbian mirror at mirror.os6.org down?

I had the same problem yesterday as well. Annoying I could not install anything.. and the package installer did not want to move to another mirror! I came up with a quick workaround.. in /etc/hosts file I put the ip address of another mirror (with the same directory structure, mirror.web-ster.com in...
by mosespi
Fri Apr 14, 2017 7:59 am
Forum: General discussion
Topic: Power Consumption
Replies: 6
Views: 11872

Re: Power Consumption

You really need to know approximate power draw. Use web resources to estimate what your Pi setup will draw or get a multi-meter or USB power meter and test your setup. The recommended power adapter rating of 2.5A is the maximum and is almost never reached by most Pi 3s. A Pi 3 with little or no draw...
by mosespi
Fri Apr 14, 2017 12:22 am
Forum: Troubleshooting
Topic: cgps displays a NO FIX even when recieving GPS data
Replies: 12
Views: 5294

Re: cgps displays a NO FIX even when recieving GPS data

One more thing.. you may need to remove it from cmdline.txt too

remove "console=serial0,115200" from /boot/cmdline.txt (note serial0 may be ttyAMA0 or ttyS0 depending on OS and PI version)
$ sudo vi /boot/cmdline.txt
by mosespi
Fri Apr 14, 2017 12:15 am
Forum: Troubleshooting
Topic: cgps displays a NO FIX even when recieving GPS data
Replies: 12
Views: 5294

Re: cgps displays a NO FIX even when recieving GPS data

It looks like your console is still running.. you need to disable it. Probably the last set of commands at the bottom should work. Regards, -Moses Stop serial terminal service, the Universal command will work for current modem version of Raspbian Jessie, others provided for reference # Universal com...
by mosespi
Fri Apr 14, 2017 12:10 am
Forum: Off topic discussion
Topic: Soldering Devices
Replies: 11
Views: 2562

Re: Soldering Devices

https://www.youtube.com/results?search_query=soldering

Personally I just use a soldering iron to keep my tea warm.
by mosespi
Thu Apr 13, 2017 8:09 am
Forum: General discussion
Topic: safer way to battery power raspberry pi in car
Replies: 2
Views: 914

Re: safer way to battery power raspberry pi in car

Take a look at this one. Disclosure: it is my design and was initially made to use NiMH batteries. http://www.allspectrum.com/mopower/ You can also wire it to constant power, at shutdown it uses less then 1ma with the new firmware. You don't need a battery unless you want one, that is if you have *g...
by mosespi
Wed Apr 05, 2017 7:56 pm
Forum: HATs and other add-ons
Topic: Geekworm ups pi hat
Replies: 59
Views: 32781

Re: Geekworm ups pi hat

I was not able to find out whether there is an external supply. My way to solve is to check battery level continuously and when it goes down below 40% I turn it off. Simple Python script works. What I also noticed is that when you apply after power down the external voltage you need to press the mi...
by mosespi
Wed Apr 05, 2017 8:12 am
Forum: General discussion
Topic: Shorted 5v and Ground with Multimeter
Replies: 9
Views: 2088

Re: Shorted 5v and Ground with Multimeter

Your current (mA, A, Amps, etc..) input on your meter should go through a fuse.. you are supposed to put it in series as mentioned. You 'break' one of your supply wires and use the meter in between to measure the current flow through that wire. You don't want any direct voltage through this input, e...

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