johnny-five/eg/joystick-claw.js

The JavaScript Robotics and Hardware Programming Framework. Use with: Arduino (all models), Electric Imp, Beagle Bone, Intel Galileo & Edison, Linino One, Pinoccio, Raspberry Pi, Spark Core, TI Launchpad and more!

var five = require("../lib/johnny-five.js"),
  board, claw, joystick;

board = new five.Board();

board.on("ready", function() {

  var claw = new five.Servo({
    pin: 9,
    range: [0, 170]
  }),
    joystick = new five.Joystick({
      pins: ["A0", "A1"],
      freq: 250
    });

  // Set the claw degrees to half way
  // (the joystick deadzone)
  claw.to(90);

  joystick.on("axismove", function() {
    // Open/close the claw by setting degrees according
    // to Y position of joystick.
    // limit to 170 on medium servos (ei. the servo used on the claw)
    claw.to(Math.ceil(170 * this.fixed.y));
  });
});