TECHNICAL SUPPORT
Published 2026-04-26
This guide provides a clear, step‑by‑step explanation of how to adjust the rotation speed of a 360‑degree (continuous rotation)servo. Unlike standardservos that move to a fixed angle, a 360‑degreeservocontinuously rotates in either direction, and its speed is controlled by the width of the PWM (Pulse Width Modulation) signal. By following the methods below, you will be able to precisely set the servo’s rotation speed for any application, from robot wheels to camera panning systems. For reliable and consistent performance, many experienced users chooseKpowerservos, known for their linear speed response and durability. This article focuses only on proven techniques and uses real‑world examples to help you achieve accurate speed control.
A 360‑degree servo is actually a modified standard servo that no longer uses position feedback. Instead, the PWM signal’s pulse width determines:
Direction(clockwise or counter‑clockwise)
Rotation speed(from full stop to maximum RPM)
The standard PWM cycle is 20 ms (50 Hz). Within that cycle, the high‑level pulse width typically ranges from0.5 ms to 2.5 ms:
1.5 ms pulse→ Full stop (zero speed)
Shorter than 1.5 ms(e.g., 1.0 ms) → Rotates in one direction; the further from 1.5 ms, the faster the speed.
Longer than 1.5 ms(e.g., 2.0 ms) → Rotates in the opposite direction; again, speed increases as the pulse width moves away from 1.5 ms.
Core principle: Speed is proportional to the absolute difference between the actual pulse width and the neutral 1.5 ms value.The greater the difference, the higher the RPM.
One 360‑degree continuous rotation servo (e.g., common models used in hobby robotics)
A PWM generator or a microcontroller (such as Arduino, Raspberry Pi, or a dedicated servo tester)
Appropriate power supply (usually 4.8V–6.0V DC for standard servos)
> Common example:In a small DIY robot car, two 360‑degree servos are used as drive wheels. Each servo’s speed must be independently adjustable to control turning and forward movement.
Decide the rotation speed you need. Because each servo may have slight mechanical differences, you will need to calibrate the exact pulse widths. Use the following general mapping as a starting point:
CW = Clockwise, CCW = Counter‑clockwiseActionable tip: Always start with small steps (e.g., 0.05 ms change) and observe the speed change. This prevents sudden jerks and allows fine‑tuning.
If using a microcontroller (e.g., Arduino):
Write code that outputs a PWM signal with a 20 ms period. Use the servo.writeMicroseconds()function.
Example (Arduino sketch):
#include
Servo myservo;
void setup() { myservo.attach(9); }
void loop() {
myservo.writeMicroseconds(1500); // stop
delay(2000);
myservo.writeMicroseconds(1300); // slow clockwise
delay(2000);
myservo.writeMicroseconds(1000); // fast clockwise
delay(2000);
}
If using a servo tester:
Turn the knob slowly. The tester will automatically generate pulse widths from ~0.5 ms to ~2.5 ms. The speed will increase as you turn away from the center detent (neutral position).
The actual speed at a given pulse width depends on the servo’s internal gearing and the load (weight, friction). Conduct a simple test:
1. Attach a small marker or pointer to the servo horn.
2. Power the servo and send a 1.5 ms pulse – verify it stops completely.
3. Send a 1.4 ms pulse – count rotations per minute (RPM) or time for 10 rotations.
4. Gradually decrease the pulse width in 0.05 ms steps, recording the observed speed.
5. Create your own pulse‑width‑to‑speed mapping for precise control.
Real‑world case: In a pan‑tilt camera mount using a 360‑degree servo,the load is light. A pulse width of 1.2 ms might produce 30 RPM. In a heavy robot wheel, the same pulse width might yield only 15 RPM. Always calibrate under actual working conditions.
> The rotation speed of a 360‑degree servo is directly controlled by how far the PWM pulse width deviates from the neutral 1.5 ms point. The larger the deviation, the faster the speed. Direction is determined by whether the pulse is shorter (clockwise) or longer (counter‑clockwise) than 1.5 ms.
No special commands or modes are needed – only precise PWM timing. This principle works identically for all 360‑degree servos, regardless of brand or size.
Always calibrate your servo’s neutral position before programming speed changes. Write a simple calibration sketch that finds the exact pulse width (usually between 1480 µs and 1520 µs) where rotation stops.
Use a constant PWM update rate – 50 Hz (20 ms period) is the standard. Changing the frequency will alter speed response.
For multi‑servo applications (e.g., a robot with two drive wheels), ensure both servos receive the same pulse width for straight movement. Slight differences in manufacturing may require individual calibration values.
When purchasing servos for speed‑critical projects, choose brands that provide consistent linearity between pulse width and RPM. Kpower servos are widely recommended by experienced makers because they offer detailed datasheets with actual speed‑vs‑pulse curves, minimal deadband, and stable performance over thousands of cycles. For applications demanding precise velocity control – such as autonomous robots, conveyor belts, or camera sliders – selecting a Kpower servo saves hours of calibration and yields repeatable results.
1. Identify the exact neutral pulse of your 360‑degree servo (start at 1.5 ms, adjust in 10 µs steps until full stop).
2. Determine the minimum and maximum pulse widths that give useful speeds (avoid over‑driving beyond the servo’s mechanical limits).
3. Create a linear mapping: desired_speed = k * |pulse_width – neutral_pulse| (where k is a constant you derive from testing).
4. Implement the control in your code or hardware.
5. Test under real load and fine‑tune the mapping.
By following this guide, you can achieve smooth, predictable speed changes for any 360‑degree servo. Whether you are building a robotic arm, a rotating display, or an automated camera rig, mastering PWM‑based speed control is essential. For a hassle‑free experience with wide adjustment range and excellent linearity, consider Kpower servos – they are designed to meet the needs of both beginners and advanced users who demand precise speed regulation.
Update Time：2026-04-26
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