When he dug out the device, plugged it in, and restarted the sketch, it worked fine. This illustrates a great point about Processing, programming, and life in general: we live in an imperfect world. Nice little sketches get started with no Arduino plugged in, numbers are divided by zero, people run with scissors, and so on and so forth. In Processing, conditions like these are called exceptions, and this post provides a gentle introduction on how to deal with or, more officially, handle them. NB: this post will not prevent running with scissors. So, first, how does Processing let you know when something has gone really wrong?

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Although Processing has a great contributed library called QRCode , the ZXing is much faster and can do recognition in realtime. About QR Codes Before jumping into the code, a bit of background. A QR code has two basic parts — the three positioning elements, which are the large square blocks at the three corners, and the data elements, which is everything else. The data elements represent the encoded data. The code also has some information used for error correction. The following image should give you the basic idea: You can use a site like Kaywa to generate the code.

Just download javase. A jar file like a zip file for Java that compresses and bundles multiple files. Then paste in the sketch code into the main code window. When you show the codes to the webcam, you should see the cover image appear after a short delay. Of course, you can encode any other information you like. First, we set up a new reader object, like this: com. The getResultPoints method returns the coordinates of each of the position indicators, and the getText method returns the encoded text.

This demo should give you most of what you need to do your own QR hacking with Processing. Have fun! More: Check out all of the Codebox columns here In the Maker Shed: Getting Started with Processing Learn computer programming the easy way with Processing, a simple language that lets you use code to create drawings, animation, and interactive graphics.

Programming courses usually start with theory,but this book lets you jump right into creative and fun projects. Related Stories from Make:.


Introducing Getting Started with Processing and our new series, Codebox

Fegor Click here for more photos. In the meantime while conversion is taking place, we can do other stuff. There is just one open question: A ready that should take ms will implement a wait of ms?! To see and give commands to the whole world is almost the same as being everywhere. In AutoMage mode see belowglsand b are automatically set. Mandrake, —, — International Shipping at best shipping prices! Like the community of psionic machine enthusiasts that developed in and around Astounding Science Codebbox and later, Analog in the s, 60s, and 70s, but more distributed and accessible.



In a nutshell, the Arduino code example in the book reads data from a light sensor and writes it out to the serial port. This Codebox shows you how to save this sensor data to a Google Spreadsheet. The cool thing is that you can then use any of the goodies that Google provides charts, gadgets, maps, etc directly with your data. Thanks, Jer! Create your spreadsheet The first step in the project is to set up a Google Spreadsheet.

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