Controller using audio line for communication with intelligent terminal

The utility model discloses a controller using an audio line for communication with an intelligent terminal. The controller comprises an MCU and a communication processing unit on the periphery of the MCU. One side of the communication processing unit is connected to the MCU, and the other side is connected to an audio line connector. The communication processing unit comprises a signal conditioning circuit, a clock comparison circuit, a code stream comparison circuit, and a D trigger. The controller is high in versatility. An audio interface is a standard interface owned by any intelligent terminal without much difference. Through expansion of peripheries of the controller, external equipment can be interconnected with an intelligent terminal in a simple and cheap way, and the software load added to the external equipment is very small. A method for communication between the controller and the intelligent terminal can realize stable and reliable communication between the intelligent terminal and the external equipment, and enables the external equipment to rely on the powerful data processing, data storage and network interaction capabilities of the intelligent terminal so as to expand application of the external equipment.