QR codes

solo

Not sure this is the right place for this but anyway...

I need to use QR codes for a project and wanted to know if anyone has used them yet and how I can implement them effectively.

I would like to add a QR code on a site sign so that passers by can get information regarding the project off the web by using their smart phone.

How far/big does it need to be in order for a phone to read it? I do not have a fancy smart phone and do not intend getting one however if anyone has used a QR code with a phone can you please weigh in as to how easy it works and how accurate must the image be for the link to take place.

Thanks.

Chris Fullmer

Smartphones can read things that are barcode size no problem. So about 1.5 x 1.5 inches is just fine.

But the larger it is, the easier it is read it. But too big (10x10 feet for example) would be so big the person might have to be halfway into the street to get the whole thing in the frame of their phone camera. So too big can be bad. But too small and no one will ever notive it.

I've seen some that are in the 2x2 to 4x4 inch range (about 3x3 to 6x6 cm) range. The size you posted on the screen is plenty large enough to read too.

Chris

Rich O Brien

Hi Pete,

I've QR code app on my iphone which i use where and when its available. It never fails to find the link and works 99.9% of the time.

Your code led to Ian Tomlinson article and took seconds to register it at that size. The only place ive experienced problems has been on poter at bus stops etc which can be a tad large and framing becomes an issue

Hope this helps

solo

Thanks guys.

The thing is that this is part of the Trinity project in Dallas, so the sign will be 6x8 ft (render of completed project) and in the lower right will be a QR code, pedestrians will view sign from around 15ft away, so I'm figuring it should be about 1x1ft maybe?

Chris Fullmer

1'x1' means my camera has to be about 5' away from the code to be able to get it intot he frame to scan it. I think that is just fine.

It should also be at about eye level if possible. My phone like to sacn things straight on, so if it up too high, it will be skewed in the image. If its down too low, the user might have to get down on the ground to scan it.

Chris