HOW DOES IT WORK?

Color 4 Click is based on the VEML6040, an advanced RGB/ambient light sensor from Vishay Semiconductors, providing fast and accurate spectral measurements. It is based on the Filtron™ technology achieving the closest ambient light spectral sensitivity to real-human eye responses. The VEML6040 senses red, green, blue, and white light and processes those signals by a signal conditioning circuit designed with CMOS technology. This digital RGBW information can be used in feedback control systems, among other things, to monitor and actively control a light source.

This Click board™ detects light intensity under multiple lighting conditions and through different attenuation materials, including dark glass. The VEML6040 provides a selectable measurement range from 515.4lx up to 16.496lx with the highest sensitivity of 0.007865lx/step. Its peak sensitivities for red, green, and blue are 645nm, 575nm, and 460nm, respectively. Moreover, it provides excellent temperature compensation, keeping the output stable under changing temperatures.

Color 4 Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard Mode operation with a clock frequency of 100kHz and Fast Mode up to 400kHz. The VEML6040 contains one configuration register (00h) used for operation control and parameter setup. Its measurement results are stored in four separate registers, each for red, green, blue, and white, with addresses from 08h to 0Bh, respectively. All registers are 16-bit wide.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

SPECIFICATIONS