I am using HiTechnic Colour Sensor for Lego Mindstorms NXT. I am using the Lego Mindstorms EV3 Software Version 1.2.1, EV3 Brick and Firmware Version 1.09H. I have two new HiTechnic Colour Sensors (which I am using for the first time). The issue is that both of them are not detecting black colours. They are correctly detecting all other colours (red, blue...) and I am confused and unable to diagnose the problem as to why it is unable to detect black colour. Is there any configuration required?
HiTechnic Colour Sensor unable to detect black colour on EV3 brick
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The solution is to place the sensor in an angle (there is a recommended angle and distance). Earlier I was not placing it at angle. The sensor works best when it is placed at a certain angle.