• map()

(:source http://github.com/arduino/Arduino/raw/master/libraries/Servo/examples/Sweep/Sweep.ino lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/libraries/Servo/examples/Sweep/Sweep.pde lang=arduino tabwidth=4:)

Sweep

Sweeps the shaft of a RC servo motor back and forth across 180 degrees.

This example makes use of the Arduino servo library.

• attach()
• write()
• map()

• Servo library reference
• Knob - control the position of a servo with a potentiometer.

Code

(:div class=BOM :)

Hardware Required

• Arduino Board
• (1) Servo Motor
• hook-up wire

(:divend:)

(:div class=circuit :)

Circuit

click the images to enlarge

images developed using Fritzing. For more circuit examples, see the Fritzing project page

Schematic

(:divend:)

(:source lang=arduino tabwidth=4:)

(:sourceend:)

Servo motors have three wires: power, ground, and signal. The power wire is typically red, and should be connected to the 5V pin on the Arduino board. The ground wire is typically black or brown and should be connected to a ground pin on the Arduino board. The signal pin is typically yellow, orange or white and should be connected to pin 9 on the Arduino board.

int pos = 0; // variable to store the servo position

Examples > Servo Library

Sweep

Description

Sweeps the shaft of a servo motor back and forth.

Circuit

Servo motors have three wires: power, ground, and signal. The power wire is typically red, and should be connected to the 5V pin on the Arduino board. The ground wire is typically black or brown and should be connected to a ground pin on the Arduino board. The signal pin is typically yellow or orange and should be connected to pin 9 on the Arduino board.

Code

// Sweep
// by BARRAGAN <http://barraganstudio.com> 

#include <Servo.h> 

Servo myservo;  // create servo object to control a servo 
                // a maximum of eight servo objects can be created 

int pos = 0;    // variable to store the servo position 

void setup() 
{ 
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
} 


void loop() 
{ 
  for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
  {                                  // in steps of 1 degree 
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(15);                       // waits 15ms for the servo to reach the position 
  } 
  for(pos = 180; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees 
  {                                
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(15);                       // waits 15ms for the servo to reach the position 
  } 
} 

See also

• Servo library reference