Manual coil winding in speaker manufacturing often leads to irregularities in the number of turns, requires a significant amount of time, and causes physical fatigue for the operator. Therefore, this research aims to design and develop an automatic speaker coil winding machine based on the Arduino Mega microcontroller to improve the efficiency and accuracy of the winding process. The device utilizes a stepper motor as the main actuator, a keypad for inputting the number of turns and speed (RPM), and a 1.3-inch OLED screen to display relevant information. The system is controlled by a program written in the Arduino IDE, which coordinates the rotation and lateral movement of the spool based on user input. Testing was conducted using two types of wire—0.20 mm and 0.25 mm—at speed variations ranging from 80 to 110 RPM. The test results show that the machine is capable of winding coils with high precision, achieving an average accuracy above 98%. Additionally, it provides faster winding times and more uniform coil layers compared to the manual method. Therefore, this device is considered a viable alternative for small to medium-scale speaker production.