The VEML6040 is a digital color sensor developed by Vishay. It measures red, green, blue, and white (RGBW) light intensity using photodiodes and provides digital output via the I²C interface.

 

Install via Library Manager (Recommended)

1. Open the Arduino IDE.

2. Go to Sketch → Include Library → Manage Libraries...

3. In the Library Manager, search for:

   VEML6040

4. Look for a library like:

   • VEML6040 by thewknd
     or a similar name (e.g., Adafruit might also provide one).

5. Click Install.

/*

The MIT License (MIT)

Copyright (c) 2015 thewknd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/

#include "Wire.h"
#include "veml6040.h"

VEML6040 RGBWSensor;

void setup() {
  Serial.begin(9600);
  Wire.begin(2,0); 
  if(!RGBWSensor.begin()) {
    Serial.println("ERROR: couldn't detect the sensor");
    while(1){}
  }
   

    
  RGBWSensor.setConfiguration(VEML6040_IT_320MS + VEML6040_AF_AUTO + VEML6040_SD_ENABLE);
	
  delay(1500);
  Serial.println("Vishay VEML6040 RGBW color sensor auto mode example");
  Serial.println("CCT: Correlated color temperature in \260K");
  Serial.println("AL: Ambient light in lux");
  delay(1500);
}

void loop() {
  Serial.print("RED: ");
  Serial.print(RGBWSensor.getRed());  
  Serial.print(" GREEN: ");
  Serial.print(RGBWSensor.getGreen());  
  Serial.print(" BLUE: ");
  Serial.print(RGBWSensor.getBlue());  
  Serial.print(" WHITE: ");
  Serial.print(RGBWSensor.getWhite()); 
  Serial.print(" CCT: ");
  Serial.print(RGBWSensor.getCCT());  
  Serial.print(" AL: ");
  Serial.println(RGBWSensor.getAmbientLight()); 
  delay(400);
}

Note: The range of the raw values (RGBW) can vary depending on the integration time (IT) and gain configured in the sensor. With an integration time of 320 ms, the sensor is more sensitive and can reach higher values.