Answers.Body: <p>A good way to do this is to use a control algorithm with feedback to control the position of the second motor. You can research &quot;PID&quot; to learn how to make your own.</p>
  <p>Or if you want an out-of-the-box experience, there is a PID block from HiTechnic available that does this. It can be downloaded from <a href="https://modernroboticsinc.com/downloads/" rel="nofollow noreferrer">here</a> (search for &quot;PID&quot;). There is also a <a href="https://www.youtube.com/watch?v=d0bghBZZMUg" rel="nofollow noreferrer">YouTube video</a> showing how the block works.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-05-13T11:39:52.090Z
Answers.Text: That's great! I didn't know you could program your own blocks. Is there a guide on how to create them?
Answers.UserDisplayName: algiogia
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-05-13T15:50:54.663Z
Answers.Text: This sounds like a great question that others might be interested in. So you should ask it as a new question rather than in the comments. :-)
Answers.UserDisplayName: David Lechner
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-05-12T14:40:19.897Z
Answers.LastActivityDate: 2022-05-12T14:40:19.897Z
Answers.UserDisplayName: David Lechner
Body: <p>I'm trying to make a program in NXT 2.0 that mirrors the (manual) movements of one motor to another.</p>
  <p>I managed to start motor B running in the right direction but I am having trouble controlling the number of degrees. I tried using the <code>degree</code> output of the sensor as input for the motor but it doesn't work: the B motor moves a bit but not the same amount of motor A.</p>
  <p><a href="https://i.sstatic.net/c16FY.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/c16FY.png" alt="enter image description here" /></a></p>
  <p>So I tried with a loop instead: rotate motor B until its position is equal to motor A.</p>
  <p><a href="https://i.sstatic.net/xWT2v.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/xWT2v.png" alt="enter image description here" /></a></p>
  <p>The second solution works slightly better but is still not precise.</p>
  <p>Any suggestions?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-05-10T11:31:24.420Z
Comments.Text: @user253751 doesn't look like it's possible. I can only set the amount of degrees,  rotations or time
Comments.UserDisplayName: algiogia
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-05-10T12:37:38.883Z
Comments.Text: @user253751 it (should) rotates of the given degrees from the current position
Comments.UserDisplayName: algiogia
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-05-10T14:56:41.120Z
Comments.Text: @user253751 I've tried that already. I'm passing the value to the motor but it doesn't move the right amount.
Comments.UserDisplayName: algiogia
Tags: <mindstorms><nxt><motor><sensor>
Title: NXT - Mirror motor rotation
UserDisplayName: algiogia
ThreadText: # NXT - Mirror motor rotation
  
  (Asked by: username_0 on 2022-05-10)
  
  I'm trying to make a program in NXT 2.0 that mirrors the (manual) movements of one motor to another.
  
  I managed to start motor B running in the right direction but I am having trouble controlling the number of degrees. I tried using the `degree` output of the sensor as input for the motor but it doesn't work: the B motor moves a bit but not the same amount of motor A.
  
  [![enter image description here](https://i.sstatic.net/c16FY.png)](https://i.sstatic.net/c16FY.png)
  
  So I tried with a loop instead: rotate motor B until its position is equal to motor A.
  
  [![enter image description here](https://i.sstatic.net/xWT2v.png)](https://i.sstatic.net/xWT2v.png)
  
  The second solution works slightly better but is still not precise.
  
  Any suggestions?
  
  **Tags:** mindstorms, nxt, motor, sensor
  
  > **Comments:**
  > **username_0**: @user253751 doesn't look like it's possible. I can only set the amount of degrees,  rotations or time  
  > **username_0**: @user253751 it (should) rotates of the given degrees from the current position  
  > **username_0**: @user253751 I've tried that already. I'm passing the value to the motor but it doesn't move the right amount.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2022-05-12. Score: 2 | Accepted answer
  
  A good way to do this is to use a control algorithm with feedback to control the position of the second motor. You can research "PID" to learn how to make your own.
  
  Or if you want an out-of-the-box experience, there is a PID block from HiTechnic available that does this. It can be downloaded from [here](https://modernroboticsinc.com/downloads/) (search for "PID"). There is also a [YouTube video](https://www.youtube.com/watch?v=d0bghBZZMUg) showing how the block works.
  
  > **Comments:**
  > **username_0**: That's great! I didn't know you could program your own blocks. Is there a guide on how to create them?  
  > **username_1**: This sounds like a great question that others might be interested in. So you should ask it as a new question rather than in the comments. :-)  
  
  ---
  
  