4-DOF Robot Arm Simulator

Explore a browser-based 4-DOF robot-arm simulation: move four 0–180° joints, inspect mapped PWM values, and copy Arduino Servo.h starter code.

What this tool does

RobotServo displays an animated four-joint arm and maps each selected angle to an illustrative servo pulse width. It can also generate an Arduino Servo.h starter sketch for the current targets.

Who this is for

• Students learning joint angles and servo control concepts
• Makers sketching a four-servo arm before wiring hardware
• Developers preparing a starter Arduino control example

How to use this tool

1. Move the base, shoulder, elbow, and gripper sliders from 0 to 180 degrees
2. Orbit the WebGL view to inspect the arm pose
3. Open Outputs or Code to review the current angle/PWM table and generated sketch
4. Copy the Arduino code if clipboard access is available

Inputs

Inputs are four joint angles: base rotation, shoulder/base elevation, elbow, and gripper, each represented by a 0–180° slider.

Outputs

The page shows an animated arm, current angles, a linearly mapped 1000–2000 microsecond PWM table, and generated Arduino code using pins 9–12. It has no file export or persistence.

Example use cases

• Compare arm poses before building a prototype
• Explain how servo angle maps to an illustrative pulse width
• Copy a starter sketch for adapting to compatible hardware

Frequently asked questions