The role of a QR code reader in access control is to provide a secure and efficient way to grant access to authorized individuals. QR codes are two-dimensional barcodes that can be scanned using a smartphone or a specialized QR code reader. In access control systems, QR codes are often used to grant access to a specific area or building.

When an individual arrives at a secure location, they are required to present their QR code to the reader. The reader scans the code and verifies its authenticity. If the code is valid, the access control system grants access to the individual. If the code is invalid or has already been used, access is denied.

QR code readers are often used in conjunction with other security measures, such as security cameras and biometric scanners, to ensure that only authorized individuals are granted access. They are also useful for tracking who has accessed a particular area and when, which can be helpful in the event of a security breach or other incident.

Overall, the role of a QR code reader in access control is to provide a secure and efficient way to grant access to authorized individuals while maintaining the highest level of security and control.