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Servo Motors (Precise Angle Control) | NexaLearn IoT Lab | NexaLearn

Motors25 دقيقة

Servo Motors (Precise Angle Control)

How to move a robotic arm precisely to 90 or 180 degrees.

Lesson Content

A servo is not a motor that spins continuously. It contains a DC motor, a gearbox, and a control circuit that reads PWM signals from Arduino and translates them into a precise angle between 0 and 180 degrees. We use the built-in <Servo.h> library to control it easily using the write(angle) function.

Components Needed

Arduino Unoمحرك Servo SG90 صغير

Wiring Notes

Brown/black wire to GND, red to 5V, orange/yellow to a PWM-capable pin (like pin 9).

Code Example

#include <Servo.h>
Servo myServo;

void setup() {
  myServo.attach(9); // ربط السيرفو بالدبوس 9
}
void loop() {
  myServo.write(0); delay(1000);
  myServo.write(90); delay(1000);
  myServo.write(180); delay(1000);
}

Common Mistakes

Using a large servo (like MG996R) powered directly from Arduino, which will cause voltage drops and continuous Arduino resets. An external power source must be used for large servos.

Try in Simulator

Open in Wokwi Simulator

Next Lesson

DC Motors & Motor Driver