Build Your Own Photon NeoPixel Sensor

// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>
#include <math.h>
#include "Particle.h"
 
#define PIXEL_COUNT 24						// 24 Pixels on our ring
#define PIXEL_PIN D6						// Ring uses D6 as default pin
#define PIXEL_TYPE WS2812B					// Ring uses WS2812 Pixels
 
Adafruit_NeoPixel ring(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);	// Create out “ring” object
 
// Function prototypes
void sensor_red(void);
void sensor_green(void);
void sensor_blue(void);
float get_colorIntensity(void);
 
// Min / Max values for the recorded colors
int rMax = 861;
int rMin = 15000;
int gMax = 15;
int gMin = 270;
int bMax = 17;
int bMin = 300;
 
 
// Setup function
void setup() 
{
    Serial.begin(9600);
    
    // TCS3200 connections
    pinMode(D0, INPUT);         // OUT
    pinMode(D1, OUTPUT);        // S2
    pinMode(D2, OUTPUT);        // S3
    pinMode(D3, OUTPUT);        // OE
    pinMode(D4, OUTPUT);        // S0
    pinMode(D5, OUTPUT);        // S1
    
    // TCS3200 Frequency
    digitalWrite(D4, HIGH);     // 20% frequency
    digitalWrite(D5, LOW);
    
    // Enable TCS3200 output (active low)
    digitalWrite(D3, LOW);
    
    // Start the NeoPixel object
    ring.begin();          
    
    // Set the brightness of the pixels to 30%
    ring.setBrightness(30);
    
}
 
 
// Main loop
void loop() 
{
    // This code is used to calibrate the sensor output and uncommented once min / max values have been recorded
    /*
    sensor_red();
    Serial.print("R: " + String(get_colorIntensity()) + "  ");
    sensor_green();
    Serial.print("G: " + String(get_colorIntensity()) + "  ");
    sensor_blue();
    Serial.print("B: " + String(get_colorIntensity()) + "  ");
    Serial.println();
    */
    
    // Read each color and map it accordingly 
    sensor_red();
    int redValue = map(int(get_colorIntensity()), rMin, rMax, 0, 255);
    sensor_green();
    int greenValue = map(int(get_colorIntensity()), gMin, gMin, 0, 255);
    sensor_blue();
    int blueValue = map(int(get_colorIntensity()), bMin, bMax, 0, 255);
   
    // Set all the NeoPixels to the Red, Green, and Blue values recorded by the TCS3200
    for(int i = 0; i < PIXEL_COUNT; i ++)
    {
        ring.setPixelColor(i, uint8_t(redValue), uint8_t(greenValue), uint8_t(blueValue));  
    }
    
    // Update the NeoPixel
    ring.show();        
}
 
 
// S2 = 0 and S3 = 0
void sensor_red(void)
{
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);    
}
 
// S2 = 0 and S3 = 1
void sensor_blue(void)
{
    digitalWrite(D2, LOW);
    digitalWrite(D3, HIGH);    
}
 
// S2 = 1 and S3 = 1
void sensor_green(void)
{
    digitalWrite(D2, HIGH);
    digitalWrite(D3, HIGH);    
}
 
 
float get_colorIntensity(void)
{
    return pulseIn(D0, HIGH);
}

    // This code is used to calibrate the sensor output and uncommented once min / max values have
    // been recorded
    /*
    sensor_red();
    Serial.print("R: " + String(get_colorIntensity()) + "  ");
    sensor_green();
    Serial.print("G: " + String(get_colorIntensity()) + "  ");
    sensor_blue();
    Serial.print("B: " + String(get_colorIntensity()) + "  ");
    Serial.println();
    */

// Min / Max values for the recorded colors
int rMax = 861;
int rMin = 15000;
int gMax = 15;
int gMin = 270;
int bMax = 17;
int bMin = 300;