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17. 3月 2026

Driving a Servo Motor — SIK Circuit 8

Control a servo motor to sweep through positions. Learn about the Servo library, include directives, and how to precisely control motor position from 0 to 180 degrees.

手順

Parts & Introduction

A servo motor can be precisely positioned between 0 and 180 degrees. Unlike a regular motor that just spins, servos hold their position — making them perfect for robotics, pan/tilt mechanisms, and control surfaces. This experiment introduces the Servo library.

Parts Needed

1x Arduino Uno + USB cable
1x Breadboard
1x Servo Motor (with 3-pin header)
8x Jumper Wires

The servo has three wires: Red (power), Black (ground), White (signal).

このステップの材料:

SparkFun Inventors Kit - V3.21 キット

Arduino Uno R31 個

Breadboard1 個

Servo Motor1 個

Jumper Wires3 個

必要な工具:

Computer with Arduino IDE

Hardware Hookup

Wiring Instructions

Connect 3 jumper wires to the servo's female 3-pin header for breadboarding.
Connect the Red wire to 5V.
Connect the Black wire to GND.
Connect the White wire (signal) to Digital Pin 9.

Power Note: Servos draw significant current. If the servo twitches and the Arduino resets, use a wall adapter instead of USB power, or power the servo from a separate 5V supply.

このステップの材料:

Servo Motor1 個

Jumper Wires3 個

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

servo_motor.inoarduino

/*
SparkFun Inventor's Kit
Example sketch 08 — SINGLE SERVO

Sweep a servo back and forth through its full range of motion.

Hardware connections:
  Servo RED wire (power) to 5V
  Servo WHITE wire (signal) to digital pin 9
  Servo BLACK wire (ground) to GND

This code is completely free for any use.
*/

#include <Servo.h>

Servo servo1;

void setup()
{
  servo1.attach(9);
}

void loop()
{
  int position;

  // Quick moves to specific positions
  servo1.write(90);    // Go to 90 degrees
  delay(1000);
  servo1.write(180);   // Go to 180 degrees
  delay(1000);
  servo1.write(0);     // Go to 0 degrees
  delay(1000);

  // Slow sweep to 180 degrees (2-degree steps)
  for(position = 0; position < 180; position += 2)
  {
    servo1.write(position);
    delay(20);
  }

  // Slow sweep back to 0 degrees (1-degree steps)
  for(position = 180; position >= 0; position -= 1)
  {
    servo1.write(position);
    delay(20);
  }
}

このステップの材料:

Arduino Uno R31 個

必要な工具:

Computer with Arduino IDE

Test & Experiment

What You Should See

The servo quickly moves to 90°, 180°, and 0° (1 second each), then slowly sweeps from 0° to 180° and back.

Troubleshooting

Servo not moving: Even with colored wires, it's easy to plug a servo in backwards. Check connections.
Twitching/resetting: The servo draws too much power from USB. Use a wall adapter or separate power supply.