STM32 Nucleo and ISL29125 RGB color light sensor Arduino example

In this example we look at the ISL29125 RED, GREEN and BLUE color light sensor

Here is some info about the sensor

The ISL29125 is a low power, high sensitivity, RED, GREEN and BLUE color light sensor (RGB) with an I² C (SMBus compatible) interface. Its state-of-the-art photodiode array provides an accurate RGB spectral response and excellent light source to light source variation (LS2LS). The ISL29125 is designed to reject IR in light sources allowing the device to operate in environments from sunlight to dark rooms. The integrating ADC rejects 50Hz and 60Hz flicker caused by artificial light sources. A selectable range allows the user to optimize sensitivity suitable for the specific application.

In normal operation mode the device consumes 56µA, which reduces to 0.5µA in power-down mode. The ISL29125 supports hardware and software user programmable interrupt thresholds. The Interrupt persistency feature reduces false trigger notification. The device operates on supplies (VDD) from 2.25V to 3.63V, I² C supply from 1.7V to 3.63V, and operating temperature across the -40°C to +85°C range.

Connection

Parts List

Here are the parts I used

Code

This example requires the https://github.com/sparkfun/SparkFun_ISL29125_Breakout_Arduino_Library

[codesyntax lang="cpp"]

#include <Wire.h>
#include "SparkFunISL29125.h"

// Declare sensor object
SFE_ISL29125 RGB_sensor;

void setup()
{
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize the ISL29125 with simple configuration so it starts sampling
  if (RGB_sensor.init())
  {
    Serial.println("Sensor Initialization Successful\n\r");
  }
}

// Read sensor values for each color and print them to serial monitor
void loop()
{
  // Read sensor values (16 bit integers)
  unsigned int red = RGB_sensor.readRed();
  unsigned int green = RGB_sensor.readGreen();
  unsigned int blue = RGB_sensor.readBlue();
  
  // Print out readings, change HEX to DEC if you prefer decimal output
  Serial.print("Red: "); Serial.println(red,HEX);
  Serial.print("Green: "); Serial.println(green,HEX);
  Serial.print("Blue: "); Serial.println(blue,HEX);
  Serial.println();
  delay(2000);
}

[/codesyntax]

Output

Open the serial monitor – this is what you should expect to see

Red: 1B2
Green: 123
Blue: 14B

Red: 1B1
Green: 123
Blue: 14A

Red: 1B7
Green: 126
Blue: 14D