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The Raspberry Pi has only a single PWM output. The Dagu Rover 5 chassis has 4 motors and 4 optical encoders that need reading as well. So my approach was to get a PWM servo/logic controller that could control the Dagu Motor Controller and additionally some servos for the camera pan/tilt.
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I’ve just written a blog post for O’Reilly media and we’d very much appreciate it if you check it out, share it (ideally via the social media buttons on it) and spread it to your friends/colleagues. Please take the 5 minutes to do this as this would be very helpful for us. Thank you. The ShareButton component in Codename One is one of the most important pieces in making your app a viral success. In Android it fires the nativ..
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As I’ve mentioned in previous posts, I run all my websites on a MiraBox– my nifty, low-power ARM server. As awesome as it is having a low-power server, it does make things more difficult. I’m a Ruby on Rails developer, and I run three websites on this thing, along with a gitolite installation so I can host my own code. However, I recently began a few projects collaborating with other people, and as the projects grow, gitolite is not the col..
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If you are new to Ruby I suggest you first read my previous post which in short explains why you should not give up on learning Ruby. Starting with this post, I’ll be writing some tutorials covering the first steps you could follow in order to get familiar with both the language (Ruby) and the framework (Ruby on Rails). My posts will be based on my own experience so I hope that anyone new here can understand them easily. First things ....
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If you are new to Ruby I suggest you first read my previous post which in short explains why you should not give up on learning Ruby. Starting with this post, I’ll be writing some tutorials covering the first steps you could follow in order to get familiar with both the language (Ruby) and the framework (Ruby on Rails). My posts will be based on my own experience so I hope that anyone new here can understand them easily. First things ....
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One thing I’m really proud of is that when we launched Discourse, we had first class Internationalization (i18n) support ready to be used. Our first release only English, but thanks to our community we have 18 localizations of our software in progress! Here’s what Discourse looks like in Simplified Chinese: On the server side, Discourse uses Rails’ built in i18n support . It has been around for a long time and works easily so I wo..
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Yesterday morning Brett Terpstra posted an article to his blog calling for open auditions to guest on his podcast Systematic. Like many, many others I’m sure, I made a submission. I briefly introduced myself then, in typical Systematic fashion, went on to my top three picks for the “show”. Looking to increase my chances of getting the spot, I decided to make an extra effort by posting an article here in case Brett decides to look for furt..
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An interesting story made all the more absorbing by the model Amanda employed in stark contrast to the one nearly all writers in the circles I frequent employ. Whereas we hold the individual’s reputation on high — I read people, not websites — she takes the opposite approach in impersonally finding, occupying, and ultimately cashing out on an existing niche rather than create her own as I and many others are want to do. A thought-provokin..
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This is a guest post from Tad Vizbaras from Etasoft in South Florida. There are a number of editors and IDEs for Go development. LiteIde, Vim, Emacs and GEdit just to name a few. Each developer has their own favorite editor for each language they work with. Some like full featured IDE environments while others prefer speed over features. My personal favorite editors for Go development at the moment are Vim and GEdit. GEdit co....
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This came out 5 months ago but the guy from PubNub didn’t update us on the status so we just didn’t notice this until now. That’s probably a good sign of us being too busy. There is now official PubNub integration for Codename One, which means you can get push like fast 2 way communications between devices without writing too much code. How does it work?
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Freenas with Transmission and Couchpotato/Sick(-Beard, -Rage) as a DLNA-Server
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www.zufallsheld.de
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12 years ago
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eng
I’m going to describe how to set up Freenas with the popular plugins couchpotato, sickBeard or sickRage and transmission to use them for downloading movies or series and streaming them via DLNA as well as mounting the storage on Linux. This post is also available in German! I integrated SABnzbd! You’ll find a how-to in my other blog post If you want to know how to setup Headphones, look here With this setup, I man....
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I discovered an XSS flaw in a website a month ago and reported it to the owners. As a thank you they sent me a hat, a rather large american sized t-shirt and a pair of “DeFeet” socks (guaranteed to stay cooler and drier than any other brand). I didn’t expect them to ship something like that overseas...
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I discovered an XSS flaw in a website a month ago and reported it to the owners. As a thank you they sent me a hat, a rather large american sized t-shirt and a pair of “DeFeet” socks (guaranteed to stay cooler and drier than any other brand). I didn’t expect them to ship something like that overseas...
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Figure 1. Taken from my Wife’s office window, around 10am. The weather was great this week - crisp and autumnal, with beautiful sunshine all week. It snowed a little on the local mountains and Cypress Mountain has opened for (limited) Skiing already, using the lower temperatures to make lots of extra snow. Whistler also opened this week, along with Grouse. Figure 2. Taken from my Wife’s office window in the afternoon, during the Gold..
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Agents of Change: Profiles of Disruptive Thinkers - Jim Highsmith
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www.thoughtworks.com
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12 years ago
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eng
In the first in our interview series with industry luminaries, we chat with Jim Highsmith, executive consultant at Thoughtworks. He has more than 30 years of experience in IT and is the recipient of the 2005 Stevens Award for outstanding contributions to systems development.
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This year marked the first time I have taken any interest in reading long-form hardware and software reviews of any kind. Previously, as I described in Diary of a Convert , I rarely made it past the first few pages; this time around, however, I not only plowed through John Siracusa’s twenty-four page epic, but many others’ as well. I learned a great deal about Apple’s latest hardware and software offerings through this process, something..
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Have you ever found yourself in this situation. You have a case statement inside of a for loop and you would like to break from both the case and for statements in a single call? var err error timeout := time.After(30 * time.Second) sigChan := make(chan os.Signal, 1) signal.Notify(sigChan, os.Interrupt) complete := make(chan error) go launchProcessor(complete) for { select { case <-sigChan: ....
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Recently I’ve started building a remote-controllable rover. The main purpose of this is the exercise of controlling an embedded system and make actual things move with code.
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Scaling Python/Django application with Apache and mod_wsgi
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engineering.hackerearth.com
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12 years ago
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eng
HackerEarth is primarily based on Python & Django. And we use Apache with mod_wsgi for hosting the application. There is a general complaint that Apache sucks when it comes to hosting Python web applications. It’s said that it’s slow, bloated, uses lots of memory and doesn’t perform very well. It’s also said that it doesn’t handle a high number of concurrent requests. All that is true if you are not running the Python application in the ....
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Recently I’ve started building a remote-controllable rover. The main purpose of this is the exercise of controlling an embedded system and make actual things move with code.
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Uncle Bob Martin: Is the software industry trying to write the script for Hamlet by hiring a million monkeys to bang on keyboards? Perhaps we should rethink that strategy and hire one bard instead. Perhaps, instead of hoards of novices, we need a small team of professionals. http://blog.8thlight.
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Ironically, one of the reasons that I started writing Puppet code, was so that I could spend more time designing and building, and less time writing documentation. I suppose I’m a victim of my success, because Puppet-Gluster has grown large enough to warrant its own documentation. So I gave in, and put together some documentation. It’s available as markdown , and, also as a pdf . As before, there is an examples/ directory which yo..
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Ironically, one of the reasons that I started writing Puppet code, was so that I could spend more time designing and building, and less time writing documentation. I suppose I’m a victim of my success, because Puppet-Gluster has grown large enough to warrant its own documentation. So I gave in, and put together some documentation. It’s available as markdown , and, also as a pdf . As before, there is an examples/ directory which yo..
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I will do such things – What they are yet, I know not; but they shall be The terrors of the earth!”_ King Lear, Act 2, Scene 4
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I think about my English classes almost every day when I sit down to write, and even some days when I don’t. I think about how much I hated them, how I dreaded each pointless class and similarly meaningless assignment, and then I think about the eternal debt of gratitude I owe those three teachers for seeing me through. Permalink.
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So after a few months of Chinese holiday delays, my ErgoDox DIY keyboard kit has finally arrived. There are amazing videos of how to assemble the thing on youtube, and thankfully my roommate was an electrical engineering student at CU and lent me his soldering station. I've started the process of soldering extremely tiny surface mounted diodes to the printed circuit boards. All together the project will require over 300 solder joints by m....
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So after a few months of Chinese holiday delays, my ErgoDox DIY keyboard kit has finally arrived. There are amazing videos of how to assemble the thing on youtube, and thankfully my roommate was an electrical engineering student at CU and lent me his soldering station. I've started the process of soldering extremely tiny surface mounted diodes to the printed circuit boards. All together the project will require over 300 solder joints by m....
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To create image thumbnails from a PDF document, run this in a terminal window: $ convert -thumbnail x300 -background white -alpha remove input_file.pdf[0] output_thumbnail.png The parameters to convert do the following things: ParameterEffect-thumbnailSimilar to -resize, but optimized for speed and strips metadata.x300Make the thumbnail 300px tall, and whatever width maintains the aspect ratio.-background whiteSets the t....
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I had the opportunity to give my RESTful WeB APIs and MongoDB Go For A Picnic talk at both MongoTorino and NoSQL Day . The folks at PUG Friuli where so nice to record all the NoSQL Day sessions, so here you have it: the full length video of yours truly speaking to a fully packed room crowded with 120 very attentive attendees. Unfortunately audio is horrible and while all MongoTorino talks were in english, NoSQL Day was an italian-o..
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I had the opportunity to give my RESTful WeB APIs and MongoDB Go For A Picnic talk at both MongoTorino and NoSQL Day . The folks at PUG Friuli where so nice to record all the NoSQL Day sessions, so here you have it: the full length video of yours truly speaking to a fully packed room crowded with 120 very attentive attendees. Unfortunately audio is horrible and while all MongoTorino talks were in english, NoSQL Day was an italian-o..
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I had the opportunity to give my RESTful WeB APIs and MongoDB Go For A Picnic talk at both MongoTorino and NoSQL Day . The folks at PUG Friuli where so nice to record all the NoSQL Day sessions, so here you have it: the full length video of yours truly speaking to a fully packed room crowded with 120 very attentive attendees. Unfortunately audio is horrible and while all MongoTorino talks were in english, NoSQL Day was an italian-o..
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This post is rather outdated now, and so the details contained within are no longer valid. Read with caution. I recently came across the rather snazzy looking subscriber count button on the Smashing Magazine website. A quick Google revealed that these are no longer available after MailChimp redesigned their service . Boo! An example of the Smashing Magazine counter: So, a quick look through the coding on this Smashing Magazin..
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Not on nginx, but still want your Tumblr blog in a subdirectory? Henrik Nyh has got your back . Have not personally used this, being a fan of nginx, but should at least be a good starting point to get you on your way.
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I had the opportunity to give my RESTful WeB APIs and MongoDB Go For A Picnic talk at both MongoTorino and NoSQL Day . The folks at PUG Friuli where so nice to record all the NoSQL Day sessions, so here you have it: the full length video of yours truly speaking to a fully packed room crowded with 120 very attentive attendees. Unfortunately audio is horrible and while all MongoTorino talks were in english, NoSQL Day was an italian-o..
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Technology Adoption Curves vs. Birth Year and Life Expectancy
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www.danstroot.com
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12 years ago
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eng
Asymco has done a fascinating piece of research mapping technology adoption curves, technology refresh rates, and human lifespan, to predict technology lifetime ownership. "...knowing how what innovations become universal and the speed at which these technologies are replaced can give us an idea of what individuals might experience in their lifetimes." This post Technology Adoption Curves vs. Birth Year and Life Expectancy first appear..
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Facebook has changed the rules yet again, this time related to logging in to Facebook from 3rd party applications. Up until now we used the web based OAuth approach for logging into Facebook since that allowed us to keep the same implementation across Android, iOS, Blackberry etc. without changing anything. However, the new Facebook 2 factor authentication is a very complex process and Facebook really went overboard with a very elaborate mo..
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