magnetometer-log.md

Compass - Logger

Run this example from the command line with:

node eg/magnetometer-log.js

var chalk = require("chalk"),
  five = require("johnny-five"),
  board, colors, servo, mag, count, dirs, lock;

(board = new five.Board()).on("ready", function() {

  count = -1;
  dirs = ["cw", "ccw"];
  lock = false;

  [
    // Medium Speed Counter Clock Wise
    [92, "ccw"],
    // Medium Speed Clock Wise
    [88, "cw"]

  ].forEach(function(def) {

    // Define a directional method and default speed
    five.Servo.prototype[def[1]] = function(speed) {
      speed = speed || def[0];

      this.move(speed);
    };
  });


  // Create a new `servo` hardware instance.
  servo = new five.Servo({
    pin: 9,
    // `type` defaults to standard servo.
    // For continuous rotation servos, override the default
    // by setting the `type` here
    type: "continuous"
  });


  // Create an I2C `Magnetometer` instance
  mag = new five.Magnetometer();

  // Inject the servo and magnometer into the REPL
  this.repl.inject({
    servo: servo,
    mag: mag
  });

  // set the continuous servo to stopped
  servo.move(90);

  // As the heading changes, log heading value
  mag.on("headingchange", function() {
    var log;
    var color = colors[this.bearing.abbr];

    log = (this.bearing.name + " " + Math.floor(this.heading) + "°");

    console.log(
      chalk[color](log)
    );



    if (!lock && this.bearing.name === "North") {
      // Set redirection lock
      lock = true;

      // Redirect
      servo[dirs[++count % 2]]();

      // Release redirection lock
      board.wait(2000, function() {
        lock = false;
      });
    }
  });

  this.wait(2000, function() {
    servo[dirs[++count % 2]]();
  });
});

colors = {
  N: "red",
  NbE: "red",
  NNE: "red",
  NEbN: "red",
  NE: "yellow",
  NEbE: "yellow",
  ENE: "yellow",
  EbN: "yellow",
  E: "green",
  EbS: "green",
  ESE: "green",
  SEbE: "green",
  SE: "green",
  SEbS: "cyan",
  SSE: "cyan",
  SbE: "cyan",
  S: "cyan",
  SbW: "cyan",
  SSW: "cyan",
  SWbS: "blue",
  SW: "blue",
  SWbW: "blue",
  WSW: "blue",
  WbS: "blue",
  W: "magenta",
  WbN: "magenta",
  WNW: "magenta",
  NWbW: "magenta",
  NW: "magenta",
  NWbN: "magenta",
  NNW: "magenta",
  NbW: "red"
};

 

License

Copyright (c) 2012-2014 Rick Waldron [email protected] Licensed under the MIT license. Copyright (c) 2015-2023 The Johnny-Five Contributors Licensed under the MIT license.