Whenever you're traveling, there's always a chance you could lose your camera, so you should save your pictures as you go. The Pi image bank can save images and even display the pictures via a web server.

Recent versions of Raspbian turn off SSH in the default configuration. You'll need to start it manually if you're planning on remote access.

Create a web page to generate your own QR codes, use MIT's App Inventor to build an Android QR code reader, and finally, put QR codes on your Pi and Android sensors with links to documentation or real-time web data.

The tree command can provide a clear view of all your files and directories, and offers a few advantages over the usual ls.

You can access and control the Raspberry Pi camera module from your favorite browser using the RPi Cam Web Interface software.

So, you have some new kit for your Arduino – maybe some sensors or ICs – but programming them is clumsy and painful. Don't despair: You can make your life easier by writing your own drivers!