Show Posts
Pages: 1 ... 21 22 [23] 24 25 ... 47
331  Using Arduino / Project Guidance / Re: Switching SATA cables on: April 15, 2013, 02:39:31 pm
I thought SATA was hotplug-able? If not......oops.

I didn't know that, but it seems you're right - it is hot pluggable. However, that assumes you're using standard SATA connectors to make/break the connections, and also that you're powering the device via the SATA connection. If you're going to physically intercept the wires then you would need to determine the correct connection/disconnection sequence and ensure that your switch/relay system followed it.

This strikes me as a lot more dodgy than the original solution of powering the drives separately and connecting them via a standard USB hub - I am simply not convinced this is going to be a more reliable solution.

I'm with you on that. If adding more SATA ports via a PCI/PMCIA/MSATA/port multiplier card isn't an option, getting more reliable SATA to USB adapters/docks would be the best solution.
332  Using Arduino / Project Guidance / Re: Measuring water level in a borewell on: April 14, 2013, 04:17:09 pm
The hole is going to be 420 feet deep, but how much of that will be water? Could you hang an arduino with a ultrasonic sensor on 400 feet of cable, so it can measure a 20' (or something) variation at the bottom?

I like the float on a string method. Keeps all the expensive stuff above ground, and gives you a large range of measurement. If you don't pull the float to the surface for every test, you might want to use a pre-marked rope so you can tell if it has slipped.
333  Using Arduino / Project Guidance / Re: Switching SATA cables on: April 14, 2013, 03:01:37 pm
My worry about your plan to switch the SATA/USB adapter between different SATA drives is that SATA is not designed to be switched like that and I don't know what will happen to the devices on either side when you perform the switch while either side is live. It could easily damage either of them.

Just powering up the devices as needed, leaving each one permanently connected to a USB hub and using standard decent quality components throughout seems like the most sensible approach - in fact, the only sensible approach.

Do you have a scheme to unmount the drives before you power them off? You really need to, to avoid the possibility of corrupting the drives.

I thought SATA was hotplug-able? If not......oops.

Any particular reason why you don't just get a RAID card with more SATA ports, then just power on and mount the drives as necessary? You would get better transfer speeds and eliminate everything except the SATA cables.
334  Using Arduino / Project Guidance / Re: Decoding playstation controller question on: April 08, 2013, 01:36:53 am
You could try this:
http://www.billporter.info/2010/06/05/playstation-2-controller-arduino-library-v1-0/
335  Using Arduino / Project Guidance / Re: Wii to SATA converter on: April 06, 2013, 01:37:20 am
Even if you could make an adapter that works, the copy protection would keep you from using any of the data anyway.
336  Community / Bar Sport / Re: Lawn Mower on: April 05, 2013, 11:55:49 am
The ones I have seen use the same "invisible fence" transponders that dog collars use. It might work like a roomba though, you would just need to program the boundary once, and it would still be able to navigate around things inside that area.
337  Community / Bar Sport / Re: Good, Cheap Camera for Close Ups? Macro? on: April 04, 2013, 10:39:44 am

I picked up a Sony A330 on eBay for cheap. Its a decent entry level DSLR, plenty of features, seems pretty idiot proof (and was compatible with all my Minolta lenses).

Just looked these up on Ebay and the body goes for very cheap, but the lenses are in the hundreds.  Might have to keep an eye on this one.


I picked up one for my dad without the lens for $250, and mine came with the stock lens for $300. They were store display units that Sony wouldn't allow the stores to sell as open box I guess. IIRC, the A200 is a lot cheaper, and the only major difference is the lack of a tilt LCD.
338  Community / Bar Sport / Re: Good, Cheap Camera for Close Ups? Macro? on: April 04, 2013, 07:35:34 am
I picked up a Sony A330 on eBay for cheap. Its a decent entry level DSLR, plenty of features, seems pretty idiot proof (and was compatible with all my Minolta lenses).
339  Community / Bar Sport / Re: Naming robots on: April 02, 2013, 10:57:17 pm
We named our Arduino-powered submersible "FREUD". It stands for Field Remote Expeditionary Underwater Device. Bonus points to anyone that gets the reference.

Naming the bot is useful if you are working on many of them, or making it a group project. It just makes it easier to refer to it as a name, name project files/folders after it, and title papers after it.
340  Community / Bar Sport / Re: Won't be soldering these.... on: March 30, 2013, 03:25:30 pm
Getting a 404 when clicking the link.

They probably forgot to water the transistors again.
341  Using Arduino / Project Guidance / Re: frequency range for Arduino on: March 28, 2013, 09:59:20 am
Homemade Arduino "medical" equipment.  smiley-eek What could possibly go wrong?
342  Using Arduino / Project Guidance / Re: IP Camera on: March 27, 2013, 09:42:18 pm
The Ubiquiti Aircams are pretty straightforward IIRC. You can stream directly from them using RTSP, but only for a few connections.
343  Community / Bar Sport / Re: Where did you lose your packages? Who's lost packages as buyer/seller? on: March 25, 2013, 09:59:37 pm

Given where morale is headed in the USPS system, I can only hope that the postal police will keep that kind of behavior in check in the US.

I did mail an Xbox 360 to someone and have it arrive looking like it fell out of an airplane...during a hurricane. Not sure what the postman was thinking when he dropped it off. Probably "not my problem". The little punk that received it tried to blame me for the damage too, filed every complaint form he could find with Paypal and Ebay. I don't usually waterproof my shipments.
344  Community / Bar Sport / Re: Ouch! Eagle Go Bye-Bye! on: March 22, 2013, 02:23:46 pm
You should look up "I wanna be the guy" for a crazy-difficult game.
345  Community / Bar Sport / Re: Where did you lose your packages? Who's lost packages as buyer/seller? on: March 21, 2013, 12:23:35 pm
I havn't lost any yet, but a couple have taken several weeks to arrive via USPS to foreign countries.  Held up in in-country Customs seems to be the cause.


Ya know, I make and sell fake bombs, and I have never had a problem with customs. I think they just choose people at random.
Pages: 1 ... 21 22 [23] 24 25 ... 47