Ever wonder what those weird black-and-white square codes are? Here's how to read them with an iPhone, a BlackBerry, or an Android smartphone.

Did you ever watch Star Wars and wondered how people understood what R2D2 was saying? Maybe [Luke Skywalker] would enjoy learning to decode QR Codes by hand, too. While it might not be very ...

But what if you want to read QR codes? [James Bowman] noticed a $7 module that claims to read QR codes so he decided to try one out. The module seems well thought out. There’s a camera, of course.

To access the information embedded in the codes, users need a smartphone with a camera, Internet access and a QR code reader app, most of which are free to download from an app store.

Sometimes, we try to capture a QR code with a good digital camera on a smartphone, but the reading eventually fails. This usually happens when the QR code itself is of poor image quality, or if it ...

It’s a snap to scan QR codes, because Apple built a QR code reader right into the camera. Simply open the camera app, hold the rear-facing camera steady so the QR code is clearly visible.

Sometimes, we try to capture a QR code with a good digital camera on a smartphone, but the reading eventually fails. This usually happens when the QR code itself is of poor image quality, or if it ...