Servo: Set Angles from 0° to 180°

Why it’s here

Use a target angle instead of a speed.

How it works

A servo command is a target position, unlike a DC motor speed command. The visual arm moves to the selected angle. Actual travel, pulse limits and current draw depend on your servo.

Try it

1. Open this experiment
2. Run at 90°, then select 0° and 180°. Watch the horn settle at each target instead of rotating continuously.

Connections

• D9 — Servo signal
• External 5V / GND — Suitable supply + shared ground

Example sketch

#include <Servo.h>
Servo arm;

void setup() {
  arm.attach(9);
}

void loop() {
  arm.write(90);
  delay(20);
}

Check your understanding

Does a target of 180 mean 180 revolutions per minute?