If you are fed up of giving your Wi-Fi password out to friends and family visiting your home or clients visiting your office, here is a perfect solution!
First you will need to generate a Quick Response code. There are many sites you are able to do this on however ZXing’s Barcode Generator was the best one I came across. In the contents drop down choose Wi-Fi network enter your SSID along with the password and network type then click generate.
This will generate a QR code which you should then print/save. Once you have the QR code you can then test this on any android device using a QR code reader. QR Code Reader is a good example of one however there are hundreds on the Play Store.
Now whenever friends, family or colleague visits you will be able to give them the QR code to scan with their android device which will authenticate them to your wireless network.