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notfred
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Re: DYMT: Imi's Legacy

Tue Dec 18, 2018 11:27 am

You can get some places where you end up with the WiFi ping-ponging like mad between 2 different APs and that can burn battery. However with the phone loaded with games, I agree that WiFi is unlikely to be the battery drain!
 
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Re: DYMT: Imi's Legacy

Wed Dec 19, 2018 12:40 pm

I find myself in definite need of a thermostat for my 12v peltier cooler now that winter is here. Long story short, if my new medicine freezes, it's 250$ per week to replace it. The plan (excuse to tinker) is an Arduino nano, two waterproof thermometers, a 12v 30a relay, and an alarm.

Since it's peltier, the ambient temperature determines the internal temperature, about 40f below ambient. During the winter this can pose serious trouble where it can even be cold enough in the non heated portions of the cab to freeze things anyway.

I'm going to put a sensor inside the cooler at the coldest spot, and outside near the intake fan. Whenever it reaches freezing temps I'll have it record or display the ambient temperature so I can understand the relationship better and build in redundancy using the external temp.

The cooler is also reversible. Changing the direction of the power will switch it to heating mode. I'm not doing it now because Im not sure how to safely trigger opposing polarities yet, but for the time being I'll set an alarm which triggers well before the minimum safe temperature but below the cutoff for the cooler.
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Re: DYMT: Imi's Legacy

Wed Dec 19, 2018 9:53 pm

I caught a screening of Into the Spider-Verse this week. It is excellent. Interesting, incredibly tightly scripted and paced, and really fun as an action movie. Absolutely worth seeing. Also has a great soundtrack, which I'm listening to now as I work.
 
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 2:00 am

An eBay seller is about to learn the hard way that when you pack heavy items, you need to immobilize them inside the packaging. Four perfectly good miniature transformers trashed because the seller didn't think they needed more than a light application of styrofoam peanuts to survive the paintshaker known as FedEx. I know eBay will side with me if the seller proves difficult, but I really wanted these.
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 7:06 am

Amazon actually runs designed experiments to determine how reducing the packaging affects return rates due to damage in transit.
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 10:41 am

Heiwashin wrote:
The cooler is also reversible. Changing the direction of the power will switch it to heating mode. I'm not doing it now because Im not sure how to safely trigger opposing polarities yet, but for the time being I'll set an alarm which triggers well before the minimum safe temperature but below the cutoff for the cooler.

A DPDT relay would allow you to do that.
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 11:59 am

derFunkenstein wrote:
Tonight I presented my final project in my final class. Unofficial, for the moment, but I am finally a “collage grajiet”.

OK now it's official. https://imgur.com/a/Lti4l2Y

And so I'll quit talking about it. :lol:
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 2:26 pm

derFunkenstein wrote:
derFunkenstein wrote:
Tonight I presented my final project in my final class. Unofficial, for the moment, but I am finally a “collage grajiet”.

OK now it's official. https://imgur.com/a/Lti4l2Y

And so I'll quit talking about it. :lol:

Congratulations!

I swear I was looking for a shorter flourish, but I couldn't help linking that one :lol:
On second thought, let's not go to TechReport. Tis a silly place.
 
Heiwashin
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 2:55 pm

just brew it! wrote:
Heiwashin wrote:
The cooler is also reversible. Changing the direction of the power will switch it to heating mode. I'm not doing it now because Im not sure how to safely trigger opposing polarities yet, but for the time being I'll set an alarm which triggers well before the minimum safe temperature but below the cutoff for the cooler.

A DPDT relay would allow you to do that.

That looks perfect :D thanks.
Looking for Knowledge wrote:
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I want to have sex, but find I am more likely to be shot down than when I am sober.
 
Captain Ned
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Re: DYMT: Imi's Legacy

Thu Dec 20, 2018 8:54 pm

There are some simple and eternal truths in the "Charlie Brown Christmas Special".

That is all.
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notfred
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Re: DYMT: Imi's Legacy

Fri Dec 21, 2018 9:31 am

As opposed to the Star Wars Holiday Special? :)
 
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Re: DYMT: Imi's Legacy

Fri Dec 21, 2018 2:08 pm

notfred wrote:
As opposed to the Star Wars Holiday Special? :)

The truth of that is, "Some things are better left unseen."
 
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Re: DYMT: Imi's Legacy

Sat Dec 22, 2018 8:44 am

Apropos of nothing, an image I just ran across:

Image
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Re: DYMT: Imi's Legacy

Mon Dec 24, 2018 9:31 pm

Doing Christmas brunch with the family at our place tomorrow. Have some marinated steelhead going in the sous-vide right now. In about a half hour I will pull it out and chill it.
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Re: DYMT: Imi's Legacy

Mon Dec 24, 2018 10:17 pm

Wow, this place really shuts down on Christmas Eve. You can count the number of posts on one hand. I’m glad there’s something more sacred to us than online stuff.
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Re: DYMT: Imi's Legacy

Tue Dec 25, 2018 12:18 am

FireGryphon wrote:
Wow, this place really shuts down on Christmas Eve. You can count the number of posts on one hand. I’m glad there’s something more sacred to us than online stuff.


Mostly video games here :lol:
Looking for Knowledge wrote:
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I want to have sex, but find I am more likely to be shot down than when I am sober.
 
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Re: DYMT: Imi's Legacy

Tue Dec 25, 2018 1:33 am

Merry Christmas to all, and to all a good night (After wrapping presents for 2 hours, it’s bed time. My wife works dozens of hours over the last month or so I can’t complain at all by doing this little part)
 
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Re: DYMT: Imi's Legacy

Wed Dec 26, 2018 9:04 am

Captain Ned wrote:
Apropos of nothing, an image I just ran across:

Image


BWAHAHAHAHA
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 11:19 am

I have spent the past 60 hours either on my feet and cooking, or sleeping, with a few moments here and there to eat and shower. I'm beat. Today will be spent in pajamas, drinking coffee and eating leftovers. Merry belated Christmas!
 
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 5:38 pm

https://www.chicagotribune.com/suburbs/ ... story.html

:o

Very lucky nobody was killed.

I am quite familiar with the shoddy maintenance of Metra equipment. I rely on them to get me to/from work every day, and they seem to have some sort of service-affecting equipment malfunction at least once a week. Add in the idiots who go around crossing gates (both pedestrians and drivers), and the people who intentionally suicide by train (more common than you'd think), and there are a lot of service disruptions.
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notfred
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 6:23 pm

That's very bad! I've dealt with safety certified software for rail systems (IEC 62279) and a single short circuit shouldn't cause the signals to fail like that.
 
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 6:33 pm

notfred wrote:
That's very bad! I've dealt with safety certified software for rail systems (IEC 62279) and a single short circuit shouldn't cause the signals to fail like that.

Knowing Metra/Amtrak (some of the infrastructure is shared, not sure who's responsible for that signal), there may not even be any software involved here. We could very well be dealing with electro-mechanical tech from the 1950s in this case.

What I do know is the train I take is cancelled or delayed on a regular basis, and the platforms at the station in downtown Chicago are in very poor shape (dimly lit, crumbling concrete columns and beams with the rebar exposed, water dripping everywhere, everything covered in diesel soot). It looks like something from a post-apocalyptic or Batman movie.
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Heiwashin
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 8:25 pm

Most of chicago looks like that :lol: at least from the roads that i drive going through it.
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Re: DYMT: Imi's Legacy

Thu Dec 27, 2018 9:24 pm

You can see the railroad's maintenance tech working on the gates during that incident. Blame him.
What I didn't hear in the video was the train's horn prior to the crossing. That's required for trains at grade level crossings in most jurisdictions, but local legislation may have changed that to avoid disturbing the neighbors.
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Re: DYMT: Imi's Legacy

Fri Dec 28, 2018 7:34 am

Heiwashin wrote:
Most of chicago looks like that :lol: at least from the roads that i drive going through it.

OK, now imagine a massive train depot with 2 dozen tracks, entirely underground, all looking like that. As an added bonus, there's insufficient ventilation to clear the diesel exhaust from the massive fleet of aging, poorly maintained locomotives. (The Chicago El/subway is entirely electric, but the Metra commuter rail system which serves the outlying areas is diesel powered.)

To be fair, they did a fair bit of work to clean up the north platforms a couple of years back, so those are in better shape than the south platforms I come in on. The office where I work overlooks the station, and I could see some of the work as it progressed; they removed a short section of Adams street that runs above the north platforms for several months while the work was being done. I think the plan was to do the south platforms too, but haven't seen any signs of that starting.

The station itself (once you leave the platforms and go inside) is reasonably nice; they've been fixing that up. A bit incongruous, actually.

IIRC they were also supposed to get some of the VW emissions settlement money to replace part of their locomotive fleet. Not sure what the status of that is.

JustAnEngineer wrote:
You can see the railroad's maintenance tech working on the gates during that incident. Blame him.
What I didn't hear in the video was the train's horn prior to the crossing. That's required for trains at grade level crossings in most jurisdictions, but local legislation may have changed that to avoid disturbing the neighbors.

The sign is too blurry to read in the dashcam video, but Google street view has your answer: https://goo.gl/maps/vfWzSPphyhG2

I'm amazed at how calm the cop is. If I had been driving in that situation there would've been a lot of loudly exclaimed expletives flying around!
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Re: DYMT: Imi's Legacy

Fri Dec 28, 2018 10:58 am

Yeah, if I had to slam on the brakes and jump the median to avoid getting squished I'm pretty sure the next thing I'd say wouldn't start with "Be advised...".
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Re: DYMT: Imi's Legacy

Fri Dec 28, 2018 11:32 am

Redocbew wrote:
Yeah, if I had to slam on the brakes and jump the median to avoid getting squished I'm pretty sure the next thing I'd say wouldn't start with "Be advised...".

That's not the first video of failed lights I've seen, and some resulted in impacts. Incidentally, since I can't do the sorts of magical redirection cars can do, I put my windows down and kill some speed when approaching blind spotted tracks.

More commonly I have driven over countless tracks where the lights remained permanently on, and in only one instance there was a cop sitting there waving people ahead. One was a particularly bad blind spot that curved behind a building maybe 200 feet away. I don't even know how long I sat there
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Re: DYMT: Imi's Legacy

Fri Dec 28, 2018 1:00 pm

Kinda thought I'd be able to get more done at work this week, with fewer people around to bombard me with random questions. The office is like a ghost town today. Unfortunately, this seems to have been almost completely offset by the fact that when issues do come up, they all land in my lap, since I'm the only person from my department who is here. :roll:

So it's basically just like any other week in terms of overall productivity...
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Re: DYMT: Imi's Legacy

Fri Dec 28, 2018 1:17 pm

just brew it! wrote:
Kinda thought I'd be able to get more done at work this week, with fewer people around to bombard me with random questions. The office is like a ghost town today. Unfortunately, this seems to have been almost completely offset by the fact that when issues do come up, they all land in my lap, since I'm the only person from my department who is here. :roll:

So it's basically just like any other week in terms of overall productivity...


Been there too.
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Re: DYMT: Imi's Legacy

Tue Jan 01, 2019 7:17 am

Hard to believe it's 2019 already.

(Where did 2018 vanish to????)

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