Microcontroller moving-dot display interface uses three I/O lines.

The article focuses on the microcontrollers moving-dot display interface circuit design. It states that the circuit uses three microcontrollers output lines, which are the data, clock and latch, and it needs hardware and firmware. Compared with bar-graph display, the moving-dot display has some advantages including better object location detection in sonar and radar applications and yielding brightness as it provides the same current for all LEDs (light-emitting diodes).