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Seeed Grove - Physical Sensor Modules - Seeed Studio 101020041, The Grove Colour Sensor from Seeed Studio uses an I2C link to transfer RGB data about a light source or surface. Seeed supply a library which handles this communication and provides your software with separate red, green and blue values. There's even a function to calculate chromaticity coordinates should you need them. Seeed provide technical documentation, example projects and software libraries on their product pages. if you require this information please visit this product's page. Seeed 101020041 Grove - Color Sensor I2C Based on TCS3414CS