Dot matrix digital pen (foreign name: Dot matrix digital pen) is a new writing tool that prints an invisible dot matrix pattern on ordinary paper. The high-speed camera on the front end of the pen captures the movement trajectory of the pen tip at any time. At the same time, the pressure sensor transmits the pressure data back to the data processor, and ultimately transmits the information outward through Bluetooth or USB cable. It is a new type of electronic product using digital optical dot matrix technology, mainly composed of pressure sensors, high-speed cameras, processors, batteries, data storage, Bluetooth or USB communication modules, and other components. It is widely used in interactive teaching classes, intelligent homework review, and other intelligent education fields, with specific advantages such as convenience, speed, and sharing.