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Oasis-Knowledge
Sensors
TCS-34725: RGB Color Channel Intensity
Introduction:
The TCS34725 sensor module is a popular color sensor used in various applications requiring accurate color detection and measurement. It integrates a digital RGB (Red, Green, Blue) sensor with an IR filter and a white LED to provide precise color readings under different lighting conditions. The sensor communicates via the I2C interface, making it easy to integrate with microcontrollers and development boards like Arduino and Raspberry Pi.
The TCS34725 features a high sensitivity and wide dynamic range, allowing it to detect subtle differences in color and brightness. Its built-in IR blocking filter minimizes the effects of infrared light, ensuring accurate color readings. The module is commonly used in projects involving color sorting, ambient light sensing, and display calibration, among others. Its compact size and ease of use make it a versatile tool for hobbyists and professionals alike.
Working Principle: What Is An RGB Sensor?
RGB stands for Red, Green, and Blue. An RGB sensor can independently detect the color intensity of red, green, and blue colors. It can also measure brightness.
The color sensor achieves this by using an RGB color filter at its input. The red color filter allows only the red color to pass through it.
The light falls on the photodiode, whose current will vary depending on the amount of incident light.
The current will be converted to a voltage using a signal conditioner which can be read using an ADC.
Functional Diagrams:
Block Diagram
Here is the block diagram of the TCS34725 sensor.
The IR block filter in the TCS34725 helps in sensing ambient light. Ambient light sensing is used in your phones when you set the brightness level to Auto. You can also find applications in TCs and Screens whose brightness will adapt automatically to their ambient.
The TCS34725 has an I2C interface (SDA and SCL) that connects to the Arduino Board. The IC also has an optional interrupt output pin which can be used to interrupt Arduino.
An example application is a fruit sorting machine. The color will be different if a fruit is not ripened. The Arduino can use this interrupt to trigger a solenoid to let the unripened fruit into another conveyor.
The sensor supports a sleep state where the typical current consumption is 2.5 uA. Hence, it is an excellent choice for battery-powered applications.
Sources:
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