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by Graymalk
Sat Dec 24, 2016 6:10 pm
Forum: Raspbian
Topic: setting up a mirror
Replies: 1
Views: 667

Re: setting up a mirror

OK, I think I have answered my own questions and will share them here for anyone else who had the same questions. First, I had forgotten that anything my Pi serves up via the web is actually owned by root (user, not owner, is www). The idea behind that is if someone breaks into the account, they hav...
by Graymalk
Fri Dec 23, 2016 5:11 pm
Forum: Raspbian
Topic: setting up a mirror
Replies: 1
Views: 667

setting up a mirror

One of the more frustrating things with my Pis is that whenever I apt-get update etc., the mirrors don't always behave well (I update several Pis with identical installations and get a different experience on each of them, every time, ranging from an update going perfectly to an update erroring out ...
by Graymalk
Thu Nov 03, 2016 10:07 pm
Forum: General discussion
Topic: Raspberry Pi can now connect to Particle IoT Cloud
Replies: 17
Views: 5359

Re: Raspberry Pi can now connect to Particle IoT Cloud

Sounds nice. I imagine a lot of people will find this interesting! I have at least one friend who already uses your service with something else so now he can try a raspberry Pi :lol:
by Graymalk
Mon Oct 31, 2016 3:48 am
Forum: General discussion
Topic: Need help: trying to link my pi to my truck
Replies: 1
Views: 460

Re: Need help: trying to link my pi to my truck

"This project is no longer maintained, and although the software works and it’s an awesome tool, some instructions below may be out of date."

You may be getting hit by the curse of the outdated tech blog, a major scourge of the internet.
by Graymalk
Fri Oct 28, 2016 4:40 pm
Forum: General discussion
Topic: I am rubbish, need new brain
Replies: 22
Views: 3910

Re: I am rubbish, need new brain

That is the kind of week I've been having!
by Graymalk
Fri Oct 21, 2016 12:09 am
Forum: General discussion
Topic: MySQL database
Replies: 30
Views: 5383

Re: MySQL database

But I should add that my use case is statistics and machine learning, which may fall a little more closely to the original poster's plans and is why I posted. Someone who is writing software with different aims in mind (especially if there will be human interaction) will be more likely to assume a m...
by Graymalk
Fri Oct 21, 2016 12:04 am
Forum: General discussion
Topic: MySQL database
Replies: 30
Views: 5383

Re: MySQL database

Actually, one huge advantage that strings have is that they *can* store an invalid value. Let's say you're trying to store a record that has a missing value. If the data type is a real, MySQL will automatically turn that into a zero, which has huge consequences because zero is *different*. So if I h...
by Graymalk
Thu Oct 20, 2016 2:52 pm
Forum: General discussion
Topic: MySQL database
Replies: 30
Views: 5383

Re: MySQL database

Just a comment... I don't know if this is "safe" or not but I often (or more like always lol) make everything in my table a varchar and then just cast when I need to. I find MySQL casts on its own which is exceedingly helpful (I find I only have to cast when using something like SQLite). So in the f...
by Graymalk
Sun Oct 16, 2016 9:22 pm
Forum: General discussion
Topic: pi to Read 7 - 240Volt signals?
Replies: 14
Views: 1925

Re: pi to Read 7 - 240Volt signals?

I'd have thought a non-invasive current sensor would be easier to use than any kind of opto-isolator. That's the type of kit used by the current cost metering folks. Yes. That is a good idea. Some quick googling turned up what might be a useful article: http://archives.sensorsmag.com/articles/0799/...
by Graymalk
Fri Oct 14, 2016 4:13 pm
Forum: General discussion
Topic: Raspberry Pi 3 does not started
Replies: 6
Views: 1069

Re: Raspberry Pi 3 does not started

So it boots without the display plugged in?
by Graymalk
Thu Oct 13, 2016 6:59 pm
Forum: General discussion
Topic: Android and iOS Apps with a GUI button to run executable?
Replies: 7
Views: 1348

Re: Android and iOS Apps with a GUI button to run executable

Just FYI there are iOS apps as well and they all operate the same way as far as I know: you create an account on their server, run the app on both handheld and Pi, and they communicate via their server. I don't know of any that allow direct communication but I don't see why it wouldn't be possible (...
by Graymalk
Wed Oct 12, 2016 3:29 am
Forum: Other projects
Topic: Is there such a thing as hardware "design patterns"?
Replies: 10
Views: 2111

Re: Is there such a thing as hardware "design patterns"?

There are quite a few, ranging from the very basics of electrical engineering to highly specific circuits like reference designs. You could always start with the same material engineering students work through. We used this book: http://global.oup.com/us/companion.webs ... edrasmith/
by Graymalk
Tue Oct 11, 2016 1:37 pm
Forum: General discussion
Topic: How to ask a good question. Sticky?
Replies: 35
Views: 6040

Re: How to ask a good question. Sticky?

Is there evidence that there's a problem that actually needs fixing? Simply look at the number of contributions made by the first two posters in this thread. More importantly, look at the consistently courteous and knowledgeable quality of their contributions. If we want to encourage and retain vol...
by Graymalk
Tue Oct 11, 2016 12:33 am
Forum: General discussion
Topic: How to ask a good question. Sticky?
Replies: 35
Views: 6040

Re: How to ask a good question. Sticky?

Is there evidence that there's a problem that actually needs fixing? I always wonder when someone brings something like this up in a forum. Is there first evidence of a problem, and is there evidence that shows that introducing such stickies and/or rules or grab bag of whatever people personally thi...
by Graymalk
Sun Oct 09, 2016 11:17 pm
Forum: General discussion
Topic: arm_freq non changing?
Replies: 20
Views: 6731

Re: arm_freq non changing?

I saw that on my first Pi 3. I found it confusing because I expected 1200 and kept seeing references here to 900.
by Graymalk
Sun Oct 09, 2016 2:22 am
Forum: General discussion
Topic: Pi 3 power consumption / undervolting
Replies: 3
Views: 5573

Re: Pi 3 power consumption / undervolting

I... Negative values... I didn't know you could do that. :lol:

I am at the opposite end of you. I want stability so I only use positives, lol.
by Graymalk
Thu Oct 06, 2016 12:34 pm
Forum: General discussion
Topic: Is it normal for raspbian to just crash?
Replies: 40
Views: 6386

Re: Is it normal for raspberrian to just crash?

raise the voltage. I've had to do this on all my Pis. In fact I have it in an image I use on any new Pi I acquire (I just raise the voltage by default now). The only Pi it hasn't stabilized is my Pi B, which I think has an anemic power adapter (raising voltage causes it not to boot). If I don't rai...
by Graymalk
Tue Oct 04, 2016 2:08 pm
Forum: General discussion
Topic: Running AI algorithms on Rpi
Replies: 55
Views: 20146

Re: Running AI algorithms on Rpi

Don't know much about machine learning, did my Uni robotics back in the 1980's, 1MHz 8 bit micros :lol: . R I know works on Pi, was looking at it for the big data I collect on IoT gadgets. Base R works. The problem arises when attempting to install certain packages. The fun part is how many coffees...
by Graymalk
Tue Oct 04, 2016 6:47 am
Forum: General discussion
Topic: Running AI algorithms on Rpi
Replies: 55
Views: 20146

Re: Running AI algorithms on Rpi

I'm studying machine learning right now and Pis are too small and slow for training. You can certainly run trained models on them though. But training is nasty slow especially with big, high dimensional data. That said though, I bet it'll run decently on small data. Could try one of the C++ machine ...
by Graymalk
Mon Oct 03, 2016 4:37 am
Forum: General discussion
Topic: My Pi gets HOT
Replies: 26
Views: 3906

Re: My Pi gets HOT

Edit: I was able to turn the brightness down. Put it as low as it will go. Not sure that will make a difference in the temp though. Well I was just thinking in terms of reducing power. Your biggest power hog and heat generator is probably the backlight. If you turn it down it might knock a few degr...
by Graymalk
Mon Oct 03, 2016 3:03 am
Forum: General discussion
Topic: My Pi gets HOT
Replies: 26
Views: 3906

Re: My Pi gets HOT

Edit: I was able to turn the brightness down. Put it as low as it will go. Not sure that will make a difference in the temp though. Well I was just thinking in terms of reducing power. Your biggest power hog and heat generator is probably the backlight. If you turn it down it might knock a few degr...
by Graymalk
Mon Oct 03, 2016 2:25 am
Forum: General discussion
Topic: My Pi gets HOT
Replies: 26
Views: 3906

Re: My Pi gets HOT

These are things I might try if I were doing this project: - make the bottom bigger and put the Pi in there, away from the screen - find a lower power screen - turn the brightness down. - underclock - if you want minimal physical changes I would try all of: turning down the brightness, underclocking...
by Graymalk
Thu Sep 29, 2016 7:35 pm
Forum: General discussion
Topic: Temperature in sealed case
Replies: 16
Views: 4277

Re: Temperature in sealed case

I just sealed the box from a fresh boot. 42C/108F was the starting temp. In a matter of a few minutes it's already up to 51 / 124. I'm going to do some chores and come back to it in a bit and see where/if it stabilizes. That's what mine all do and they never leave the 50s. They're in much more airy...
by Graymalk
Tue Sep 27, 2016 10:17 pm
Forum: General discussion
Topic: Raspberry Pi 2 Model B password not working
Replies: 12
Views: 1574

Re: Raspberry Pi 2 Model B password not workingy

I've been a Mac user since the Classic and i have no idea what you did :lol: My advice to Mac users: Just plug the Pi into your router, give it an IP address in the router, open a terminal window on the Mac, and ssh pi@address. Don't forget to secure the Mac's ssh settings as they default to somethi...
by Graymalk
Mon Sep 26, 2016 12:54 am
Forum: General discussion
Topic: Password Lost
Replies: 5
Views: 792

Re: Password Lost

Funny story: I went through all the rigamarole of mounting the root filesystem and changing the password only to continue to fail to log in. Keyboard was still set to GB and I had decided not to ssh for some reason so it got me. Oops.

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