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    18. mBot2 Won't Detect Color Properly

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    Admin
    This guide applies to:
    mBot2 and mBot Neo.

     

    Routine Check

    例行检查图四张一组.png

     

    In a Nutshell

    The color detection program doesn't recognize color correctly.

    This is usually related to the Quad RGB Sensor.

    排障22-步骤0-教程4-RGB

    What to do：

     1. Calibrate the Sensor.

     2. Check if the sensor is faulty.

     3. Try the official example.

     

    Step by Step

    #1 Calibrate the Quad RGB Sensor

    The sensor is sensitive to environmental factors such as light, surface material, and distance.

    A calibration with your current environment can greatly increase the accuracy of the detection.

    Please DO NOT calibrate when mBot2 is exposed to strong light.

    1. Get an A6 paper or use the white area of a line-following map.

    排障22-步骤1-1.png

    1. Connect mBot2 with mBlock and switch to the upload mode.

    排障22-步骤1-2-教程9-介绍.png

    For details, please see this guide: https://support.makeblock.com/hc/en-us/articles/15850718565399

    1. Download the latest device extension for the Quad RGB Sensor

    Note: If you see a green download icon, it means a newer version is available.

    Click on the sign to update the extension, and then add the extension again to enable a complete experience.

    排障22-步骤1-3.png

    1. Find somewhere flat and place a piece of white paper.

    Put mBot2 on it and power on the extension board

    The recommended distance between the sensor and the paper is 12~13mm.

    排障22-步骤1-4.png

    1. Combine the event block and the Quad RGB Sensor block together. Upload to mBot2.

    When the calibration is finished, CyberPi will display 'Calibration completed'.

    排障22-步骤1-5.PNG

    After the calibration, please run a program that involves color detection.

    See if it works. If not, the sensor itself could be faulty.

     

    #2 Check if the Quad RGB Sensor is Faulty

    1. Place mBot2 on the black area of the map;

    Or a piece of black paper on a flat surface.

    排障22-步骤2-1.png

    Note: DO NOT use white paper for the test.

    The sensor will recognize everything as white when faulty.

    1. Connect mBot2 and mBlock 5, and switch to live mode.

    排障22-步骤2-2-教程9-介绍.png

    For details, please see this guide: https://support.makeblock.com/hc/en-us/articles/15850718565399

    1. Select and edit the quad RGB sensor block to detect color as shown below.

    2. See if it detects color correctly on the upper left section in the mBlock 5 home screen.

    排障22-步骤2-3~4.png

    If it detects the color as black, which is correct, then move on to step #3.

    If it detects the color as white, the sensor could be faulty, please contact support.

    service@makeblock.com

     

    #3 Try the Official Example

    1. Go to Tutorials > Example Programs.

    Upload the 'kp line follow' program to CyberPi.

    排障22-步骤3-1.png

    1. See if mBot2 can detect color correctly.

    If not, please contact customer support.

    service@makeblock.com

     

    Related Knowledge

    https://support.makeblock.com/hc/en-us/articles/15850718565399

     

    Got Questions?

    Feel free to contact us at:

    service@makeblock.com

     

    Help Us Solve Faster

    We have listed some useful information you can provide to us.

    When you contact us, the more information you provide,

    the better informed we will be and the quicker we can advise and answer your questions.

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    Not Sure Where to Find the Version Info?

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