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Here are some of the notes I took while reading the book: When you run an Xcode project from a standard (i.e., non-admin) user, you might be asked to enter credentials of a user in the “Developer Tools group.” You can fix this by adding the (current) user to the group: When you purchase something from the Mac App Store, you’ll see a little icon in your dock, but that doesn’t show you the percentage of progress.

The icon is small, and the progress bar seems to remain blank for a long time for bigger downloads.

Disclaimer: I received this book for free through the O’Reilly Blogger program. is a very short “book” on RFID (Radio Frequency Identification), a way to tag and identify objects over varying ranges, and how to use Arduino to create a few interesting RFID projects.

The book assumes that you have some experience with Arduino and micro-controllers (i.e., do you know what a breadboard, jumper wires, and circuits are? We start with a very brief introduction to RFID, follow up with two introductory technical tutorials on Arduino, and end with a fairly simple home automation project: Between my officemate and me, we have dozens of devices drawing power in our office: two laptops, two monitors, four or five lamps, a few hard drives, a soldering iron, Ethernet hubs, speakers, and so forth.

If you try something similar with the computer (try leaving the semi-colon off in C or miss an indent in Python, for example), you’ll get a nasty error message.

This book your computer to work with the looser languages used by humans (like English) instead of the stricter counterparts used by machines.

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Triff deine Freunde im Webcamchat oder lerne neue Leute kennen.Crazy Cam ist kostenlos und wird es auch immer bleiben.Bleibe mit deinen Freunden in Kontakt und Chatte mit ihnen über die Webcam!This project is a system to reduce our power consumption, particularly when we’re not there.When either of us comes into the room, all we have to do is tap our key fobs on a reader mounted by the door, and the room turns on or off what we normally use. The reader by the door reads the presence or absence of the tags.

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