Adafruit tcs34725 colour sensor remapping to 255 values???

Other Hardware Sensors
1

Hi guys and ladies,
Im working on a project using the Adafruit tcs34725 colour sensor and a zumo robot but the example code for the sensor far exceeds my basic understanding.

Here is the example code for the colour sensor.

[quote]
#include <[color=#CC6600]Wire[/color].h>
#include [color=#006699]"Adafruit_TCS34725.h"[/color]

[color=#7E7E7E]// Pick analog outputs, for the UNO these three work well[/color]
[color=#7E7E7E]// use ~560  ohm resistor between Red & Blue, ~1K for green (its brighter)[/color]
#define redpin 3
#define greenpin 5
#define bluepin 6
[color=#7E7E7E]// for a common anode LED, connect the common pin to +5V[/color]
[color=#7E7E7E]// for common cathode, connect the common to ground[/color]

[color=#7E7E7E]// set to false if using a common cathode LED[/color]
#define commonAnode [color=#CC6600]true[/color]

[color=#7E7E7E]// our RGB -> eye-recognized gamma color[/color]
[color=#CC6600]byte[/color] gammatable[256];


Adafruit_TCS34725 tcs = Adafruit_TCS34725(TCS34725_INTEGRATIONTIME_50MS, TCS34725_GAIN_4X);

[color=#CC6600]void[/color] [color=#CC6600][b]setup[/b][/color]() {
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]begin[/color](9600);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]println[/color]([color=#006699]"Color View Test!"[/color]);

  [color=#CC6600]if[/color] (tcs.[color=#CC6600]begin[/color]()) {
    [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]println[/color]([color=#006699]"Found sensor"[/color]);
  } [color=#CC6600]else[/color] {
    [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]println[/color]([color=#006699]"No TCS34725 found ... check your connections"[/color]);
    [color=#CC6600]while[/color] (1); [color=#7E7E7E]// halt![/color]
  }
  
  [color=#7E7E7E]// use these three pins to drive an LED[/color]
  [color=#CC6600]pinMode[/color](redpin, [color=#006699]OUTPUT[/color]);
  [color=#CC6600]pinMode[/color](greenpin, [color=#006699]OUTPUT[/color]);
  [color=#CC6600]pinMode[/color](bluepin, [color=#006699]OUTPUT[/color]);
  
  [color=#7E7E7E]// thanks PhilB for this gamma table![/color]
  [color=#7E7E7E]// it helps convert RGB colors to what humans see[/color]
  [color=#CC6600]for[/color] ([color=#CC6600]int[/color] i=0; i<256; i++) {
    [color=#CC6600]float[/color] x = i;
    x /= 255;
    x = pow(x, 2.5);
    x *= 255;
      
    [color=#CC6600]if[/color] (commonAnode) {
      gammatable[i] = 255 - x;
    } [color=#CC6600]else[/color] {
      gammatable[i] = x;      
    }
    [color=#7E7E7E]//Serial.println(gammatable[i]);[/color]
  }
}


[color=#CC6600]void[/color] [color=#CC6600][b]loop[/b][/color]() {
  uint16_t [color=#CC6600]clear[/color], red, green, blue;

  tcs.setInterrupt([color=#CC6600]false[/color]);      [color=#7E7E7E]// turn on LED[/color]

  [color=#CC6600]delay[/color](60);  [color=#7E7E7E]// takes 50ms to read [/color]
  
  tcs.getRawData(&red, &green, &blue, &[color=#CC6600]clear[/color]);

  tcs.setInterrupt([color=#CC6600]true[/color]);  [color=#7E7E7E]// turn off LED[/color]
  
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#006699]"C:\t"[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#CC6600]clear[/color]);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#006699]"\tR:\t"[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](red);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#006699]"\tG:\t"[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](green);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#006699]"\tB:\t"[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](blue);

  [color=#7E7E7E]// Figure out some basic hex code for visualization[/color]
  uint32_t sum = [color=#CC6600]clear[/color];
  [color=#CC6600]float[/color] r, g, b;
  r = red; r /= sum;
  g = green; g /= sum;
  b = blue; b /= sum;
  r *= 256; g *= 256; b *= 256;
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color]([color=#006699]"\t"[/color]);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](([color=#CC6600]int[/color])r, [color=#006699]HEX[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](([color=#CC6600]int[/color])g, [color=#006699]HEX[/color]); [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]print[/color](([color=#CC6600]int[/color])b, [color=#006699]HEX[/color]);
  [color=#CC6600][b]Serial[/b][/color].[color=#CC6600]println[/color]();

  [color=#7E7E7E]//Serial.print((int)r ); Serial.print(" "); Serial.print((int)g);Serial.print(" ");  Serial.println((int)b );[/color]

  [color=#CC6600]analogWrite[/color](redpin, gammatable[([color=#CC6600]int[/color])r]);
  [color=#CC6600]analogWrite[/color](greenpin, gammatable[([color=#CC6600]int[/color])g]);
  [color=#CC6600]analogWrite[/color](bluepin, gammatable[([color=#CC6600]int[/color])b]);
}

[/quote]/code]

I would like it to map the r, g, b sensor values each from 0, 255
and code the equivalent; (i know this isn't actual code but just for example)

if sensor reading r = 255 && b =< 100 && b =< 100
then Serial.print("red") and buzzer.playNote(NOTE_A(5), 200, 15);

buzzer.playNote(NOTE_A(5), 200, 15); isn't part of the provided code but i will include the library for this when i test your suggestions.

if someone would be so kind to help me with this then i could continue with the rest of the colour/note coding into the zumo code i have been working on. I understand its hard to help without having a sensor to test but hopefully it isn't a major problem.
Thank you for your time.
2

sorry this accidentally got include in the code instead of the post.

I would like it to map the r, g, b sensor values each from 0, 255
and code the equivalent; (i know this isn't actual code but just for example)

if sensor reading r = 255 && b =< 100 && b =< 100
then Serial.print("red") and buzzer.playNote(NOTE_A(5), 200, 15);

buzzer.playNote(NOTE_A(5), 200, 15); isn't part of the provided code but i will include the library for this when i test your suggestions.

if someone would be so kind to help me with this then i could continue with the rest of the colour/note coding into the zumo code i have been working on. I understand its hard to help without having a sensor to test but hopefully it isn't a major problem.
Thank you for your time.

3

You are not necessarily going to get r=255 just because it is red.

I suggest you do some experiements to see what answers you get from the device, and understand that,
BEFORE you write heaps of code which is not going to work.

4

Hi

thanks for the reply,
i understand that the sensor seeing red will not necessarily return 255 if mapped i just am trying to lower the values so its easier to deal with if that makes sense. The readings go from hundreds to over 20,000+ without maxing out.
I have been testing the sensor and playing around with it but i don't know how to get any of the readings from the sensor into an if statement. Basically i am asking which part of the example should i include in an if statement to get the r, g, and b sensor readings???
As a terrible example;

if (the variable I'm looking for but can't see in the example for R > 75780 && the variable for G which i also can't see < 138674 && the variable for B which i also can't see < 647874)
{
// do something here
}

I apologise for my lack of understanding but I am trying.
Hopefully I have better explained myself.
Thanks

5

i understand that the sensor seeing red will not necessarily return 255 if mapped i just am trying to lower the values so its easier to deal with if that makes sense.

You answered your own question. Use the map function.