johnny-five/eg/servo.js

The JavaScript Arduino Programming Framework.

var five = require("../lib/johnny-five.js");

five.Board().on("ready", function() {
  console.log("Connected");

  // Initialize the servo
  var servo = new five.Servo(process.argv[2] || 10);

  // Servo alternate constructor with options
  /*
  var servo = new five.Servo({
    id: "MyServo",     // User defined id
    pin: 10,           // Which pin is it attached to?
    type: "standard",  // Default: "standard". Use "continuous" for continuous rotation servos
    range: [0,180],    // Default: 0-180
    fps: 100,          // Used to calculate rate of movement between positions
    isInverted: false, // Invert all specified positions
    startAt: 90,       // Immediately move to a degree
    center: true,      // overrides startAt if true and moves the servo to the center of the range
    specs: {           // Is it running at 5V or 3.3V?
      speed: five.Servo.Continuous.speeds["@5.0V"] 
    }
  });
  */

  // Add servo to REPL (optional)
  this.repl.inject({
    servo: servo
  });


  // Servo API

  // min()
  //
  // set the servo to the minimum degrees
  // defaults to 0
  //
  // eg. servo.min();

  // max()
  //
  // set the servo to the maximum degrees
  // defaults to 180
  //
  // eg. servo.max();

  // center()
  //
  // centers the servo to 90°
  //
  // servo.center();

  // to( deg )
  //
  // Moves the servo to position by degrees
  //
  // servo.to( 90 );

  // step( deg )
  //
  // Moves the servo step degrees relative to current position
  //
  // servo.step( -10 );

  // sweep( obj )
  //
  // Perform a min-max cycling servo sweep (defaults to 0-180)
  // optionally accepts an object of sweep settings:
  // {
  //    lapse: time in milliseconds to wait between moves
  //           defaults to 500ms
  //    degrees: distance in degrees to move
  //           defaults to 10°
  // }
  //
  servo.sweep();

});


// References
//
// http://servocity.com/html/hs-7980th_servo.html