LEGO Mindstorms EV3 API

The Discussion

• 

  It's awesome! I must buy it Controlling LEGO robot via WP8 is a nice feature.

• 

  Cool! thanks a lot for that introduction to LEGO MINDSTORMS EV3

• 

  Great! I love Lego...

• 

  pretty coooool, i gonna be get one for fun

• 

  Awesome kiddy Fun with Lego and Windows Phone.

• 

  First time using the API!

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Data;
  using System.Windows.Documents;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Windows.Media.Imaging;
  using System.Windows.Navigation;
  using System.Windows.Shapes;
  using Lego.Ev3.Core;
  using Lego.Ev3.Desktop;
  
  
  namespace andre_probeer_lego_ev3
  {
  /// <summary>
  /// Interaction logic for MainWindow.xaml
  /// </summary>
  public partial class MainWindow : Window
  {
  private Brick _brick;
  Int16 _vooruit = 5;
  Int16 _achteruit = -5;
  Int16 _snelheid = 10;
  uint _tijd = 1000;
  
  
  public MainWindow()
  {
  InitializeComponent();
  }
  
  private async void Grid_Loaded(object sender, RoutedEventArgs e)
  {
  _brick = new Brick(new NetworkCommunication("192.168.178.19"));
  _brick.BrickChanged += _brick_BrickChanged;
  await _brick.ConnectAsync();
  await _brick.DirectCommand.PlayToneAsync(20, 850, 1000);
  Project.Content = "Lego EV3 PA0AKV 2013";
  Display.Content = "Start";
  
  
  }
  
  void _brick_BrickChanged(object sender, BrickChangedEventArgs e)
  {
  //throw new NotImplementedException();
  
  }
  
  
  private async void Achteruit_Click(object sender, RoutedEventArgs e)
  {
  await _brick.DirectCommand.TurnMotorAtPowerForTimeAsync(OutputPort.B | OutputPort.C,_achteruit,_tijd, false);
  }
  
  private async void Vooruit_Click(object sender, RoutedEventArgs e)
  {
  await _brick.DirectCommand.TurnMotorAtPowerForTimeAsync(OutputPort.B | OutputPort.C, _vooruit, _tijd, false);
  }
  
  private async void Links_Click(object sender, RoutedEventArgs e)
  {
  _brick.BatchCommand.TurnMotorAtPowerForTime(OutputPort.B, _vooruit, _tijd, false);
  _brick.BatchCommand.TurnMotorAtPowerForTime(OutputPort.C, _achteruit, _tijd, false);
  await _brick.BatchCommand.SendCommandAsync();
  }
  
  private async void Rechts_Click(object sender, RoutedEventArgs e)
  {
  _brick.BatchCommand.TurnMotorAtPowerForTime(OutputPort.C, _vooruit, _tijd, false);
  _brick.BatchCommand.TurnMotorAtPowerForTime(OutputPort.B, _achteruit, _tijd, false);
  await _brick.BatchCommand.SendCommandAsync();
  }
  
  
  private void Regelaar_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
  {
  _snelheid = Convert.ToInt16(Regelaar.Value);
  Display.Content = Regelaar.Value;
  Vooruit1.Content = _snelheid;
  Achteruit1.Content = _snelheid * -1;
  _vooruit = _snelheid;
  _achteruit =Convert.ToInt16(_vooruit * -1);
  }
  
  }
  }
  

  It opens a form and with the slider you can manage the speed!

  It is important to change the wifi IP adress otherwise the brick cannot connect! 

  If you like the program I can mail it to you!

  This is my first C# program and it is not documented yet but it will come!

   

• 

  You could also use the MonoBrick library found at http://www.monobrick.dk/software/monobrick/
  It works with Mac OS, Linux and Windows using Mono. Apparently it also works with Windows Phone and Android.

• 

  You are right, I also made the same thing with monobrick. I still do not know wich is the easiest way!

• 

  
  www.youtube.com/watch?v=vciztvXg4Yk‎
  

• 

  Thanks for this nice Video. Time to get into it. 

• 

  How do you record this video? What software do you use?

• 

  Can you provide a link to the sample program with the 4 buttons.
  The sample download doesn't have that example and I don't know XAML.
  
  Thanks, RC

• 

  Also, with the Lego EV3 IDE you can create a Project and create programs and then download to the brick to run.
  
  Can we do that ( create a program and download to the brick ) with the API ?
  
  Thanks, RC

• 

  @Gert Heriksen: I tried to use MonoBrick, and I'm sure that it works when done correctly, but I found this one much easier to configure. I spent a long time trying to get MonoBrick to work, but never succeeded. But when I found this, I was able to get it installed, setup, and working in just a day or two. I think both are probably great and probably relatively easy to use once they are setup, but I still recommend Lego.EV3 because CodePlex has good forums and is very reliable. Also, the fact that Lego.EV3 can be installed using NuGet in Visual Studio is a good bonus.

• 

  Does the .net API presented in he video allow to get motor stress level from servos?
  Thank you
  

• 

  @pa0akv: Just got the link and am a beginner in C# Programming. Already doing pretty well with the building of the LEGO ROBOTS. The programming part now is my interest. Please send me the program I give it a try. My email:sumbuko2000@yahoo.com
  

• 

  can any one help me how to control ev3 motor by angle.
  
  for example - what code I use to lets say move motor 30 degree angle.
  
  I am trying to use following function that has steps input but I don't feel like steps and angle are related as I get different degree for same steps.
  
  
  await _brick.DirectCommand.StepMotorAtPowerAsync(OutputPort.A, fwd_power, _steps, false);

• 

  During the part about the motors, each time I start the test app, it runs the motor during the form load part. It only does this if I sent a move forward or backwards motor command in a previous run. What is causing this? I am currently using the api from nugget.

• 

  NICE BUT I CANT AFFORD IT BUT U KNOW GUYS ITS TOO EXPENSIVE

• 

  I can't connect to my EV3 via Bluetooth in a ASP.NET Core2 Web application!
  
  It says:
  "An unhandled exception occurred while processing the request.
  FileNotFoundException: Could not load file or assembly 'System.IO.Ports, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. System cannot find the file specified.
  Lego.Ev3.Desktop.BluetoothCommunication..ctor(string port)"
  
  Let me notice, it worked in ASP.NET Framework and in WPF application, but in a Core2 app, it doesn't... Please fix this somehow or please help me!

• 

  I would like to see an example of this library being used from C++ visual studio 2017. Would you be able to provide that?
  Thanks.