Immerse yourself in the world of accurate color perception using AS73211 and ATmega328P

Color 6 Click is based on the AS73211, an XYZ true color sensor from ams OSRAM. This sensor is produced by using the proprietary JENCOLOR™ filter technology, developed by this company. The sensor uses three 24bit ADC converters, which convert the measurement from the photodiodes. The photodiodes are covered by the optical filters. These filters isolate X, Y and Z color components, providing CIE 1931/DIN 5033 standard compliant color response, which matches the color response of the human eye. The irradiance responsivity (GAIN) can be set in a range of 12 steps by a factor of 2 for each step (up to 2048 times), providing a huge dynamic range, up to 3.43E+10:1. To perform the measurement, the device has to be set up first. After the POR (Power On Reset), the device is set up in the Config mode. After the successful configuration of the measurement parameters, the Measurement mode can be activated, by setting the corresponding bits in the Operation State Register (OSR). The measurement itself is stored as 16bit information, although the conversion data is 24bit wide. Without using an internal divider, only the 16 least significant bits of information are available. By employing the divider, it is possible to dynamically shift the information so the most relevant bits are accessed via the 16bit registers. There are two modes of

measurement available on this Click board™. It can use the CONT (continuous measurement), or the CMD (single measurement) measurement modes. The CONT mode outputs data continuously, using a time delay determined by the content of the BREAK register, while the CMD mode allows one measurement to be performed per command. After a single measurement is performed, the device can fall back to the Power Down or Standby state, while working in CMD mode. This is determined by the appropriate bits in the configuration registers and allows for a lower power consumption if required by the application. To allow for the best performance and most accurate measurements, the surface of the board and especially the sensor IC itself, should always stay clean and without scratches, as dirt and moisture can alter the light penetration through the filters. In addition, the manufacturer recommends that the angle of incidence stays less than 10° since the sensor IC has an aperture angle (beam width) of nearly 90°. If the angle of incidence is greater than advised, the filter shifting might occur, introducing distortion and affecting the measurement results. The spectral filters of this sensor are specialized for working with the broadband source of light, and measurement of the narrowband light sources should not be

performed by this sensor. The internal thermal sensor allows the temperature compensation to be calculated, achieving the most accurate measurements. This ADC outputs 12bit data, which can be read from the appropriate register via the I2C interface. The Click board™ itself uses a very low number of external components. In fact, it only uses one external resistor, which is used for providing the reference voltage for the internal sections of the IC, along with few resistors, used for pulling the I2C lines to a HIGH logic level when not asserted and ferrite beds, which isolate noise between the analog and digital GND. The low number of external components simplify the design with this IC, allowing it to be used in a wide range of portable applications. I2C bus lines are routed to the appropriate mikroBUS™ pins, offering simple and reliable interfacing with the host MCU. Please note that this Click board™ can work only with 3.3V MCUs and it is not 5V tolerant. The device datasheet contains all the necessary information about the registers and their values. However, the Click board™ comes supported by a library, which contains functions which simplify the development of the applications, cutting time to market.

Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an

ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the

first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.