RobotVisual lab

SG90 servo: from PWM to angle

By RobotVisual. How a servo knows which angle to move to, in 3D and from the inside.

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Loading the 3D scene

Figure 1. An SG90 servo in 3D. In this model, 1 ms is 0° and 2 ms is 180°, and the motor runs slower than the real one so you can see it. Many SG90s use a wider range (about 0.5 to 2.4 ms); check your servo’s datasheet.

A servo is a motor with a sensor that tells it where it is: the potentiometer.

What it is

Our first own lab, in 3D. You move the PWM pulse width and watch the circuit compare, the motor turn and the potentiometer report the position. And you can break it: disconnect the potentiometer and see what happens.

Step by step and automatic mode
Translucent servo: motor, gears, potentiometer and board
A mode to break it

Use it on the roadmap

Stage 3. Motors, drivers and sensors
Our lab: how a servo turns the PWM pulse into an angle.

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What it is

Use it on the roadmap

On the same topic

Robotics Bench

PlayStation controller: a trigger that pushes back

Elevator: why a small motor lifts a heavy car