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331  Using Arduino / Project Guidance / Re: I want to build: configurable fan controller + 3 thermal sensors on: May 05, 2013, 04:13:35 pm
air "jets" ?
Hmmm...doesnt know what is it... will search bout this

If you take an air compressor and force a high volume of air through a small opening, you get a "jet" of air. A really small tube (something like an IV drip line, or those straws you see on the canned air products), would work quite well at increasing air pressure I think.
332  Using Arduino / Project Guidance / Re: monitor 12 vdc automotive battery used to start backup generator on: May 05, 2013, 04:10:57 pm
Quote
I know thats an issue with LiPo batteries (one cell discharges so rapidly into another that the heat can cause the pack to burst into flame), but I didn't think it would be a problem with lead-acid batteries. I have seen many vehicles (primarily diesels) that use two batteries in parallel for starting.

Whereas the Generac generator requires a minimum of 525 CCA's which can be provided by one battery.   

My thinking is that if you have two 525 CCA rated batteries in parallel, and one fails, you still have 525 CCA worth of starting power. If you buy two batteries at different times, the chances of them failing at the same time would be fairly low (unless the failure was caused by a problem with the electrical system). I guess the one working battery would discharge into the failed one, trying to charge it, but that wouldn't really be a problem since you have a constant trickle coming from the wall when the power is on, and a constant trickle coming from the generator when its on. The second battery would not be able to discharge entirely in the short amount of time it takes for the generator to start after a power failure.

This is just my theory though, I'm not really familiar with charging systems. I'm not sure how fast the second battery would discharge into the first, or what hazard that would present.
333  Using Arduino / Project Guidance / Re: I want to build: configurable fan controller + 3 thermal sensors on: May 05, 2013, 03:27:18 pm
What if you use air "jets" instead of fans? Run thin tubing to all the places that dust collects (grills, heatsinks, hard drives). You could run all the tubing into one fitting, that plugs into a small DC air compressor. It would be like automating those "air duster" cans. Turn off the intake fans, and leave the exhaust fans on, and they will suck all the agitated dust out of the system.

My gaming PC has 3x 200mm fans, and it still collects a lot of dust. I believe this is because the dust becomes statically bound to stuff it is sitting on, making it take a significant amount of air pressure to blow it off.
334  Using Arduino / Project Guidance / Re: monitor 12 vdc automotive battery used to start backup generator on: May 04, 2013, 06:40:43 pm

Well, I did post the question as to whether I could use two batteries on my generator.  It was definitely nixed by the Generac Dealer/Installers  as a potential drain on the second battery if one battery fails.

I also submitted the question to Generac via email and am waiting on a reply.

I previously posted a link to Generac dealer discussion on this issue but it was probably deleted by the mods.


I know thats an issue with LiPo batteries (one cell discharges so rapidly into another that the heat can cause the pack to burst into flame), but I didn't think it would be a problem with lead-acid batteries. I have seen many vehicles (primarily diesels) that use two batteries in parallel for starting.
335  Community / Bar Sport / Re: should Compilers should be given personalities? on: May 04, 2013, 03:08:49 am
My compiler hates me.
So you are saying that when Richard Stallman started GCC project which had its first release in 1987, he knew somehow that there would be  a programmer who goes by the handle 'retrolefty', and put in special code just to torment this particular person.  And after control of GCC was moved to the GCC steering committee, all of us involved, keep this special code around just to make things difficult for you personally?

Somehow, even though I've been involved with the GCC project since 1988 (except for a small stint when I was working on other compilers), I seem to have missed out on this ultra-secret 'feature'.  smiley-roll smiley-roll smiley-roll smiley-roll

Obfuscation.
336  Using Arduino / Project Guidance / Re: monitor 12 vdc automotive battery used to start backup generator on: May 02, 2013, 03:41:55 pm

I recently got a small 4KW gasoline generator for $250 at Harbor Freight. I'd like to figure out how to hack it to convert it to propane and build an Arduino control system for it. Biggest problem is to hack an electric starter on an engine that doesn't have one... Hmmmm.

Buy a starter motor for a small car and replace the pullchain with a gear?
337  Community / Bar Sport / Re: should Compilers should be given personalities? on: April 30, 2013, 11:12:31 pm
I present to you the "amalgam scene specification error", aka the .ass error:

http://halo.wikia.com/wiki/.ass

Apparently Microsoft didn't think the error and accompanying picture were funny, so they patched it out after it hit the press.
338  Community / Bar Sport / Re: Flying with Arduino on: April 28, 2013, 02:36:34 pm
Still can have your Big Gulp so it's not all large capacity feeding devices.


Wouldn't that exceed the 3oz fluid limit for carry-on baggage?
339  Community / Bar Sport / Re: Why would anyone make such a crippled IDE!?!?! on: April 27, 2013, 11:24:57 pm
How many files should a library need for programs to fit and run on a freaking MCU?

Honestly, some people just can't search:

http://www.arduinodev.com/codeblocks/

WOW. Something useful actually came out of this thread. That IDE looks interesting, i'll have to check it out.
340  Community / Bar Sport / Re: Flying with Arduino on: April 27, 2013, 03:17:54 pm
It seems like a laptop computer and an Arduino board would be a great way to pass the time on long flights, as long as it doesn't attract the wrong kind of attention. I was wondering whether anyone has tried this.

Laptop, fine. Attached to an arduino with lots of wires sticking up all over, LOL. Air Marshal to the rescue.

Lefty

Yeah, god help you if they find out its linked to "hackerspaces". They'd probably just shoot you and push you out the emergency exit.
341  Using Arduino / Project Guidance / Re: Sensing a tube in a foam plate on: April 26, 2013, 12:32:08 am
Why not a PCB under the foam with regular tact switches lined up under each hole. Wire them up like a matrix keypad. Shouldn't need as many pins that way. Just spit-balling here.
TomJ

Or somthing like these small momentary pushbuttons:
http://www.digikey.com/product-detail/en/MSPS103C/450-1110-ND/525747

That would require less force that way, plus more room for error.
342  Community / Bar Sport / Re: I've started getting spam in French. on: April 25, 2013, 07:33:25 am
You should request a non-refundable $50 donation for handling the transaction.
343  Using Arduino / Project Guidance / Re: Dino sound car horn on: April 22, 2013, 01:16:56 am
Ok so i will need the uno,mp3 shield, and a micro sd card. The free pins you are talking about would be used for what? Two of them would need to be used for the speaker out but those are on the shield and you are talking about the free pins on the uno?  I think 10 extra pins would be fine. The shield stacks on top of the uno with headers that i have to buy extra then there are about 10 pins left open? Do i need to buy the headers or are they included with the uno? These extra pins would be used for speaker out -2, power and ground -2, and the signal wire used to determine which track it needs to play which is only -1. That is only a total of 5 pins. Do i have a clue on what im talking about? How easy is the programming, do i need C++ knowledge or something like that? The only programming knowledge that i have is that i know there is one. Once i have it built does it use a USB for the programming? Will all my questions be answered with a provided book with the uno?

Yes, 10 free pins on the arduino. You don't need any pins for the speaker, since there is a built in 2.5mm audio jack on the shield. I believe the headers are included. That question should be directed to Sparkfun though. Power pins are also not included in the 10, since you can connect multiple things to the same power pins.

Getting an arduino to play MP3s is not a good beginner project. While the shield and library make it pretty easy, you will want to have a firm grasp on the basics first. In this case, the Arduino really isn't doing any of the MP3 Player work. It is just sending signals to a chip on the shield that handles the decoding and playback. You will want to follow some of the tutorials in the playground prior to starting this project.
344  Using Arduino / Project Guidance / Re: Dino sound car horn on: April 21, 2013, 11:21:11 pm
It looks like there is only one mp3 shield produced. That makes my choice easy but what about the choice of the main board? Also the mp3 board looks pretty bare how do i load the mp3s on?

You load the MP3s onto a microSD card, then plug that into the shield. The shield uses quite a few pins, I think theres only 10 free pins remaining (including the analog pins), so if you need more than that you might want to look into the mega or shift registers. The Uno works fine otherwise.
345  Using Arduino / Project Guidance / Re: Dino sound car horn on: April 21, 2013, 08:55:39 pm
I had good luck with the Sparkfun MP3 Player Shield. It took a few tries to get it working, but once I got it working it worked quite well.
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