Đánh giá nhanh màn hình LCD Dell S2740L: 27", IPS, đèn nền LED Full HD, giá 8,25 triệu

Hiện nay, màn hình LCD gần như đã hoàn toàn thay thế được công nghệ màn hình CRT cũ, bởi những ưu điểm vượt trội mà nó mang lại, như kích thước lớn hơn trong khi lại gọn nhẹ hơn, màu sắc tươi sáng và đặc biệt là ít tốn điện hơn nhiều lần.

Kết quả kinh doanh Quý 3 của Dell: lợi nhuận đạt 475 triệu USD, giảm 47%

Mới đây Dell đã công bố kết quả hoạt động kinh doanh Quý 3/2012 của mình. Theo đó, lợi nhuận trong 3 tháng vừa qua của hãng đạt 475 triệu USD, giảm 47%

Windows Phone 7.8 đã hoàn chỉnh, có thể được phân phối trong vài ngày hoặc vài tuần tới

Nokia và Microsoft vừa tổ chức một sự kiện dành cho các lập trình viên tại Singapore vào ngày 17/11 vừa qua, trong đó nhất mạnh đến việc phát triển phần mềm cho Windows Phone 8.

Tuesday, 30 September 2008

Graphics demo on the Arduino and TouchShield

I just happened to be browsing around the other day, and ran into this pretty insane looking video by cathedrow. I can honestly say this is the most ridiculous program I've seen to date running on the TouchShield. I mean seriously, how on earth did you do that?

That's pretty much the coolest thing I've seen done with an Arduino to date... not worthy :-)

Sunday, 28 September 2008

Invention lab and project ideas

One of the most interesting emails I've gotten in the last couple days was pointing me to a set of websites with lots of cool gadget and project ideas. Someone mentioned that they thought it would be neat to make the Invention Lab page more like the kind of pages over at Radio Shack and Bug Labs:

Radio Shack Invention Lab
The funny thing is, I must have seen this in passing, but never really spent a lot of time there. There were a couple of pretty interesting projects that I think I'll try to make with my Arduino one of these days... the point would be to prove that you can make a lot of things with the Arduino, and that it really does simplify life quite a bit!

-A solar car
-World's smallest security system
-OBDII MPG Display - Actually, I spent some time learning OBDII a while back, so this one shouldn't be too hard...
-Homeland security helmet - A slight spin on this one that might be fun might be to make a little desktop interface that turns the TouchShield different colors when the security status changes?
-PDA notebook - this one is especially cool looking, so maybe I'll try to compress my Arduino laptop project into a book holder case

Buglabs Idea Management
Someone else wrote in saying I should check out this link... wow! Really cool stuff. I kinda look up to the guys over at Buglabs, since they're a "real" company with real funding, and a huge team of programmers. Anyway, I think it'd be a pretty nice complement to their stuff if the Arduino community had similar gadgets too, like:

-Mesh networking - actually, this one's probably not too hard to do, given some of the cool stuff over at Libelium. I have two of the Libelium Xbee shields right here on the desk, so maybe it's time to try them out!
-Solar panel module - I think solar power is definitely the future, but the hardest part is getting a large enough current to make it useful. Anyway, next time I buy something from digikey or mouser, I'll grab a few panels too.
-Qwerty keyboard - the funny part is that Pete posted this one himself. Hey Pete, feel free to grab some of the code I wrote over here! That should work for any PS2 keyboard (I'm still working on the USB one... let me know if you make anything cool with it).
-Mass storage reader - Hmmm... that's really interesting. I know Limor has hacked out SD access on her media shield... I wonder how hard it would be to make something similar for USB drives, for instance?

So I guess my little "invention lab" online notebook seems pretty lame by comparison to the ones up above, but here are a few things I'm working on:

-Etch-a-sketch project - ever since I was a kid, I wanted to make my own
-Gesture recognition PC input system - this would look so cool controlling Mathematica objects (especially now that Steve Wolfram and team have opened up the GUI for external input sources)
-Motorcycle lap timer - I can't bring myself to buy one of the expensive ones they sell in catalogs, and I feel like I could make a decent one myself now.
-Networked Arduino with token ring protocol
-Stacked RelaySquids - this one just looks cool, and would be neat controlling all the lights in my apartment :)

Anyway, thanks again for all the links and inspiration. What am I doing still typing? I have lots of projects to work on!

Thanks, y combinator!

Wow, I must live in a bubble, but bootload over at ycombinator put a link on the hacker news section about my little project, and I got a lot of emails! I had no idea what Y Combinator even was, but a little research later, I figured out they're a seed stage VC firm (I think). Anyway, it looks like they give money to small teams of smart college guys and recent grads to make projects. Sounds neat :)

I got a bunch of nice emails, and a nice list of cool project ideas too. Also, I saw a comment on the website suggesting I should try to hack together a Frogpad keyboard, so I just bought one and I'll give it a shot! If I manage to get an Arduino reading and writing from a the Frogpad keyboard, I'll be sure to post the source code, and pictures.

In the meantime, I've been inspired to upload a bunch of scans and ideas from my engineering ideas notebook up to the invention lab page. I'm thinking that I'll start posting a bunch of scans for ideas, and based on comments and any emails, I'll try my best to code them and make them real projects (of course it'd be nice to have some help too)!

Monday, 22 September 2008

Homemade Arduino laptop / palmtop thingy

This past weekend, I saw a friend with a new eeePC, and I got a bit jealous, so I decided to try to make my own. I'll admit it's not the most advanced thing you've ever seen, and it certainly doesn't run Open Office (yet - ha), but at least it's a start. And I'll have to say it definitely turned more heads at Starbucks than his eeePC when I met back up with him a couple hours ago to show it off :-)

Here's a close-up picture of the Arduino, TouchShield, DoubleWide ExtenderShield, and Lithium Backpack, sitting on top of the Happy Hacker keyboard:

When I turned it on, I could see this faint green glow from the Arduino underneath, which looked really cool:

The Happy Hacker keyboard is a simple PS/2 keyboard (nothing fancy), so it only needed to be interfaced with two pins (Data and Clock), as well as +5V and Ground. You can barely see how I plugged Data and Clock into pins 4 and 5:

And this is my first test, with the text "hello world....":

Tuesday, 9 September 2008

TouchShield function reference wiki

Ok, so speaking of things people emailed me about, I've also written up a quick wiki describing the common functions of the TouchShield.

I really like pbwiki, and I think they must have some impressive coding skills to pull off a wiki system that complex all in javascript. Anyway, the real reason I like them is because their font and layout functions are the most like a real word processor.

I made the whole reference completely wikiable, so anyone can chime in and contribute, or add functions they find useful. I don't like it when wiki's are set up by people with lots of complicated user permissions and passwords, and anyway I think that defeats the whole purpose of a wiki anyway. I hope it's helpful!

You can check out the function reference over here.

What is the projects page all about?

Well, a couple of folks have written in saying they liked the new projects section, and I’m really flattered (thanks David and Jorge)! That was actually the first thing I’ve ever written in Ruby, and I have to be honest… it wasn’t as easy as everyone makes it out to be, and I'd be lying if I didn't have a lot of help. Seriously, maybe it’s because I grew up with the old school linear programming metaphor etched into my brain, but when it comes to Ruby, I really struggled (I mean it’s kinda nifty to write things out like sentences with the object model, but it can get confusing too).

Anyway, in case you haven’t seen it yet, it looks like this:

I tried really hard to make the colors match. I have to say thanks to my really good friend Matt (no, not me, really, another Matt), who helped me with the graphic design – thanks!

I think the biggest problem is that I couldn't really find something that worked exactly like what I needed. Wiki's were a little too unstructured, and uploading photos can be a pain, most of the source code repositories - even the newer ones - are focused on text, and the description and tutorial part comes later, instruction sites like instructables was the closest for me, but the funny thing is that it's not set up for source code projects... so I guess the answer was to write my own.

I’m going to try to upload all the projects I’ve made with the TouchShield onto the site, since I was running out of places to keep the source code, pictures, and instructions all in one place.