Detecting Colors with the SparkFun Tristimulus Color Sensor

Interpreting the Results

• CIEx, CIEy, CIEz: These are the values from the CIE 1931 color space which represent the color's chromaticity.
• Detected Color: Based on the values, the code attempts to classify the color into a basic category like "Red," "Green," "Blue," etc.

The CIEx and CIEy values are going to fall somewhere between 0 and 1. Page 35 of the datasheet gives more detail on this, but generally speaking, you can map the predominant color of the space you're measuring using the following:

For more information on the CIE and CIY values, refer to the CIE 1931 Color Space Wiki Page.

If you see unexpected values or the sensor isn’t detected, double-check your wiring and ensure the sensor is properly connected to the I2C bus.