Raspberry Pi Forums

Graymalk

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...

Graymalk

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 ...

Graymalk

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

Graymalk

"This project is no longer maintained, and although the software works and it’s an awesome tool, some instructions below may be out of date."

You may be getting hit by the curse of the outdated tech blog, a major scourge of the internet.

Graymalk

That is the kind of week I've been having!

Graymalk

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...

Graymalk

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...

Graymalk

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...

Graymalk

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/...

Graymalk

So it boots without the display plugged in?

Graymalk

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 (...

Graymalk

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/

Graymalk

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...

Graymalk

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...

Graymalk

I saw that on my first Pi 3. I found it confusing because I expected 1200 and kept seeing references here to 900.

Graymalk

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

I am at the opposite end of you. I want stability so I only use positives, lol.

Graymalk

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...

Graymalk

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...

Graymalk

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 ...

Graymalk

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...

Graymalk

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...

Graymalk

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...

Graymalk

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...

Graymalk

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...

Graymalk

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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