Which control method is designed to control a single device via a wireless one-way interface?

The control method that is designed to control a single device via a wireless one-way interface is infrared. Infrared communication is commonly used for remote controls in various electronic devices, such as televisions and other AV equipment. This method operates by transmitting signals in the infrared spectrum, which allows for direct line-of-sight communication between the remote control and the device being controlled.

In this context, the one-way aspect of infrared means that the remote sends commands to the device, but there is no feedback or response sent back to the remote. This is typical for most remote control applications where the user simply needs to send commands such as "power on," "volume up," or "channel change" without necessitating a return signal.

Other communication methods, like Bluetooth and Wi-Fi, are capable of providing two-way communication, allowing for more complex interactions and feedback. Zigbee, often used for smart home devices, also supports two-way communication to enable device status updates and command confirmations. Therefore, infrared is specifically noted for its simplicity in controlling devices through a one-way interface.