Abstract: A joystick includes a body, a feature identifier and a processor. The body has a lateral portion and a bottom portion connected with each other. The bottom portion is adapted to be pressed, and the lateral portion whereon an identification element is disposed is adapted to support the bottom portion. The feature identifier is disposed under the body and adapted to acquire an identification result about the body. The processor is electrically connected with the feature identifier and adapted to analyze state of the identification element within the identification result for generating a control signal. The feature identifier is an image sensor, and accordingly the identification result is a frame captured by the image sensor.

Abstract: An optical decoding system is applied to mode conversion of a memory. The optical decoding system includes an optical sensor and a processor. The optical sensor is utilized to sense an intensity of a pattern, and variation of the intensity containing an activation code. The processor is electrically connected with the optical sensor. The processor is adapted to analyze the variation of the intensity and to switch the memory from a normal mode to a configuration mode in accordance with the activation code. Normal operation of the memory is paused while the memory is set in the configuration mode.