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by themagni
Sat May 10, 2014 10:28 pm
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Re: Data Wanted: Failure rate for power cycling

Yes, it's thousands of distributed devices without a constant Internet connection, so it won't work. The pictures are downloaded onto the Pi and shown from there on an auto-loading slideshow. I'm hoping to have them run for years at a time. They'll hard-cycle at least once a day. The set of comments...
by themagni
Sat May 10, 2014 5:42 am
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Re: Data Wanted: Failure rate for power cycling

That said, if it's fixable by moving to a boot from SD and run from USB configuration (although I'm not sure how that would help) I'd rather spend the $6 p.u. on micro USB drives instead of $10 p.u. power detection boards.
by themagni
Sat May 10, 2014 5:29 am
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Re: Data Wanted: Failure rate for power cycling

Just to return to avoiding the corruption issue all together. I'm not sure I understand your power setup. Can you give more details on this? - Have you got a main supply (battery) that gets cut-off without warning, hence the question? - You mention a reserve power supply - does this kick in when th...
by themagni
Thu May 08, 2014 4:58 pm
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Re: Data Wanted: Failure rate for power cycling

That's a cool project, pluggy. This one basically sits and runs a slideshow. Every five minutes or so it gets new files from Dropbox. If one of those files gets corrupted, it's not really the end of the world because it can just sync next time. I'm more concerned with the OS getting frapped and not ...
by themagni
Thu May 08, 2014 4:46 pm
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Re: Data Wanted: Failure rate for power cycling

Right, I understand it's a risk / probability thing. If I introduce a power monitoring cct that has a MTBF of 1000 hours of operation, am I making it better or worse? How often does the OS write to the SD card -- once a day, every five seconds? How long are the write cycle times? Is the SD card guar...
by themagni
Thu May 08, 2014 4:29 pm
Forum: Troubleshooting
Topic: Data Wanted: Failure rate for power cycling
Replies: 18
Views: 2368

Data Wanted: Failure rate for power cycling

Hi everyone, I understand that there is a risk of SD corruption when the power is unexpectedly removed from the Pi. What are the failure rates -- does anyone know the MTBF for removing the power without a safe shutdown? Here's why: my RPi project is running off a battery, and I will NOT have access ...
by themagni
Fri Apr 18, 2014 9:16 pm
Forum: Automation, sensing and robotics
Topic: Orderly shutdown your RasPi using a hard disk jumper
Replies: 11
Views: 27901

Re: Orderly shutdown your RasPi using a hard disk jumper

Forgive me for asking this question, but I don't know where to put that GPIO script so that it will run and keep watching the port.

Where should I put it, and how should I call it?

Thank you.

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