Unit Color Arduino Tutorial

#include <M5Unified.h>
#include <M5GFX.h>
#include "Adafruit_TCS34725.h"

#define commonAnode  true  // set to false if using a common cathode LED.

byte gammatable[256];  // our RGB -> eye-recognized gamma color

static uint16_t color16(uint16_t r, uint16_t g, uint16_t b)
{
    uint16_t _color;
    _color = (uint16_t)(r & 0xF8) << 8;
    _color |= (uint16_t)(g & 0xFC) << 3;
    _color |= (uint16_t)(b & 0xF8) >> 3;
    return _color;
}

Adafruit_TCS34725 tcs = Adafruit_TCS34725(TCS34725_INTEGRATIONTIME_50MS, TCS34725_GAIN_4X);

void setup()
{
    M5.begin();            
    M5.Power.begin();     
    M5.Lcd.setTextSize(2); 
    Serial.println("Color View Test!");
    while (!tcs.begin(TCS34725_ADDRESS, &Wire)) { //PORT.A 
        Serial.println("No TCS34725 found ... check your connections");
        M5.Lcd.drawString("No Found sensor.", 50, 100, 4);
        delay(1000);
    }
    tcs.setIntegrationTime(TCS34725_INTEGRATIONTIME_154MS);  // Sets the integration time for the
    tcs.setGain(TCS34725_GAIN_4X);                           // Adjusts the gain on the TCS34725
}

void loop()
{
    uint16_t clear, red, green, blue;
    tcs.getRawData(&red, &green, &blue,
                   &clear);  // Reads the raw red, green, blue and clear channel
                             // values

    // Figure out some basic hex code for visualization.  生成对应的十六进制代码
    uint32_t sum = clear;
    float r, g, b;
    r = red;
    r /= sum;
    g = green;
    g /= sum;
    b = blue;
    b /= sum;
    r *= 256;
    g *= 256;
    b *= 256;
    uint16_t _color = color16((int)r, (int)g, (int)b);

    M5.Lcd.setCursor(0, 20);                 // Place the cursor at (0,20)
    M5.Lcd.fillRect(0, 20, 120, 80, BLACK);  // Fill the screen with a black rectangle

    M5.Lcd.print("C:");
    M5.Lcd.println(clear);
    M5.Lcd.print("R:");
    M5.Lcd.println(red);
    M5.Lcd.print("G:");
    M5.Lcd.println(green);
    M5.Lcd.print("B:");
    M5.Lcd.println(blue);
    M5.Lcd.print("0x");
    M5.Lcd.print((int)r, HEX);
    M5.Lcd.print((int)g, HEX);
    M5.Lcd.print((int)b, HEX);

    delay(1000);
}