Each participant will wear a badge including a QR code (matrix code) that can be scanned to obtain the contact information of the person. It is a kind of e-business card.
To scan a QR code, there are several mobile applications.
Once downloaded, simply launch the application, authorize access to the camera and approach the QR code. The application will scan it automatically. You can then click on the History button to view all scanned QR codes. Each contact can be exported by email or saved locally:
Here is a friendly and free option for Android
QR Code Reader
Here is a friendly and free option for iOS
i-nigma QR Code – Data Matrix and 1D barcode reader