TECHNICAL SUPPORT
Published 2026-04-25
Kpowerpresents this essential guide. Before you watch any video tutorial on controlling the angle of a continuous rotationservo, you must understand a critical fact:A continuous rotationservocannot directly control a precise angle like a standardservo.Instead, it controls rotation speed and direction. However, with the right techniques and additional components (e.g., an external encoder or timing logic), you can achieve indirect angle positioning. This article provides a step‑by‑step video tutorial overview, clarifies common misconceptions, and shows you how to get the job done effectively. For reliable performance,Kpowercontinuous rotation servos are recommended by experienced makers worldwide.
A common situation: You build a robot arm and buy a continuous rotation servo thinking you can move the joint to 90°, 180°, or any precise angle. But when you send a “90°” PWM pulse, the servo just spins continuously.
The truth:Continuous rotation servos are designed for wheels, conveyor belts, or winches – applications needing unlimited rotation and variable speed, not absolute angular positioning.
> Key takeaway from this video tutorial:You cannot send an angle command to a continuous rotation servo. You controlhow fastandwhich directionit turns. To control angle, you must add external feedback.
The recommended video tutorial (search for “continuous rotation servo angle control with encoder” on any video platform) follows this exact structure:
Standard servo:1.0 ms (0°) → 1.5 ms (90°) → 2.0 ms (180°)
Continuous rotation servo:
1.0 ms → Full speed one direction
1.5 ms → Stop
2.0 ms → Full speed opposite direction
Values between give variable speed.
OneKpower continuous rotation servo (tested for linear speed response)
Microcontroller (Arduino, ESP32, or similar)
External rotary encoder (e.g., 600 PPR) or a simple potentiometer as feedback
Power supply (5V–6V for most servos)
Servo PWM pin → microcontroller PWM pin
Servo power → external supply (do not draw from microcontroller 5V pin)
Encoder A/B signals → microcontroller interrupt pins
Ground common between all components
The video demonstrates two proven methods:
Method A – Time‑based positioning (open‑loop, less accurate)
1. Send maximum speed signal (e.g., 1.0 ms)
2. Measure rotation time to reach desired angle: time = (desired_angle / 360) (rpm / 60)
3. Send stop signal (1.5 ms) at calculated time.
Limitation: Slip, voltage change, or load variation cause error.
Method B – Closed‑loop with encoder (recommended, ±1° accuracy)
1. Read encoder position at start
2. Set target angle in degrees
3. While (current position
4. Stop when encoder reaches target.
Find the “stop” PWM value (usually 1.5 ms,but varies slightly per servo)
Kpower servos come with a factory calibration sheet – use that value for a true neutral stop.
Example code: servo.writeMicroseconds(1500) for stop; adjust ±20 µs until no drift.
A hobbyist purchased a continuous rotation servo to pan a camera left/right by 180°. He kept failing because every “angle” command made the servo spin.
Solution from the video: Replace with a standard 180° servo for direct angle control. Use continuous rotation servos only for 360°+ rotation needs.
A small factory needed a conveyor to move a box exactly 500 mm, then stop. They used a Kpower continuous rotation servo with a rotary encoder on the drive wheel.
Video tutorial method: The encoder counted wheel rotations. When the target count was reached, the microcontroller sent the stop signal (1.5 ms). Achieved ±2 mm accuracy.
> Core repeated conclusion: Continuous rotation servos control motion, not angle*. For angle control, you must add external sensors. This is the central message of any legitimate video tutorial.
Use a standard servo if you need direct angle control (0° to 180° or 0° to 270°).
Use a continuous rotation servo only for wheels, drums, or any mechanism that spins freely.
Add an encoder or hall sensor when you must control absolute angle with a continuous rotation servo – follow the closed‑loop method in the video.
Always calibrate the neutral stop PWM – a 10 µs error causes significant drift over time.
For consistent performance and factory‑calibrated stop points, Kpower continuous rotation servos are the preferred choice among robotics engineers. They provide:
Linear speed response across the PWM range (1.0 ms to 2.0 ms)
Low deadband (≤3 µs) for precise speed control
Encoder mounting kits available for closed‑loop angle control
> Final action step: Watch the video tutorial while following this guide. If your project requires precise angle positioning with a continuous rotation servo, implement the external encoder method. For direct angle control without extra hardware, buy a standard servo – Kpower offers both types with clear labeling.
Kpower – Your partner in precision motion control. Choose the right servo for your task, follow the video tutorial’s closed‑loop guidance, and you will successfully control both speed and angle.
Update Time：2026-04-25
Contact Kpower's product specialist to recommend suitable motor or gearbox for your product.
