Answers.Body: <p>The color of the LED on the LEGO EV3 Color Sensor depends on which mode it is in.</p>
  
  <p>From the EV3 help file:</p>
  
  <blockquote>
    <p><strong>COLOR MODE</strong></p>
    
    <p><img src="https://i.sstatic.net/Y7Z4s.png" alt="enter image description here"></p>
    
    <p>When the Color Sensor is in Color mode, red, green, and blue LED lights on the front of the sensor will turn on.</p>
    
    <p><strong>REFLECTED LIGHT INTENSITY MODE</strong></p>
    
    <p><img src="https://i.sstatic.net/ciNGS.png" alt="enter image description here"></p>
    
    <p>When the Color Sensor is in Reflected Light Intensity mode, a red LED light on the front of the sensor will turn on.</p>
    
    <p><strong>AMBIENT LIGHT INTENSITY MODE</strong></p>
    
    <p><img src="https://i.sstatic.net/LgUrQ.png" alt="enter image description here"></p>
    
    <p>In Ambient Light Intensity mode, a blue LED light on the front of the sensor will turn on dimly.</p>
  </blockquote>
  
  <p>If you want the LED to be red, make sure you are using the Reflected Light Intensity Mode in your program.</p>
  
  <p>If you are doing this and the LED still does not turn red, you should contact LEGO MINDSTORMS customer support.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-01-02T18:48:28.990Z
Answers.LastActivityDate: 2015-03-13T19:13:18.807Z
Answers.LastEditDate: 2015-03-13T19:13:18.807Z
Answers.UserDisplayName: David Lechner
Body: <p>We had the sensor color on red and it was working with our remote.  We changed the batteries in the 'brain' and now the light sensor is blue and won't work with the remote.  Any suggestions? It's a mindstorm EV3 sensor.</p>
  
Tags: <ev3><lighting><sensor-colour>
Title: Light on color sensor is blue
UserDisplayName: Naomi
ThreadText: # Light on color sensor is blue
  
  (Asked by: username_0 on 2014-12-31)
  
  We had the sensor color on red and it was working with our remote. We changed the batteries in the 'brain' and now the light sensor is blue and won't work with the remote. Any suggestions? It's a mindstorm EV3 sensor.
  
  **Tags:** ev3, lighting, sensor-colour
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2015-01-02. Score: 3
  
  The color of the LED on the LEGO EV3 Color Sensor depends on which mode it is in.
  
  From the EV3 help file:
  
  > **COLOR MODE**
  >
  > ![enter image description here](https://i.sstatic.net/Y7Z4s.png)
  >
  > When the Color Sensor is in Color mode, red, green, and blue LED lights on the front of the sensor will turn on.
  >
  > **REFLECTED LIGHT INTENSITY MODE**
  >
  > ![enter image description here](https://i.sstatic.net/ciNGS.png)
  >
  > When the Color Sensor is in Reflected Light Intensity mode, a red LED light on the front of the sensor will turn on.
  >
  > **AMBIENT LIGHT INTENSITY MODE**
  >
  > ![enter image description here](https://i.sstatic.net/LgUrQ.png)
  >
  > In Ambient Light Intensity mode, a blue LED light on the front of the sensor will turn on dimly.
  
  If you want the LED to be red, make sure you are using the Reflected Light Intensity Mode in your program.
  
  If you are doing this and the LED still does not turn red, you should contact LEGO MINDSTORMS customer support.
  
  
  ---
  
  