Peter Drescher / Mbed 2 deprecated app-board-RGB2

Example program to cycle the RGB LED on the mbed application board through all colours

Dependencies:   C12832_lcd LCD_fonts mbed

Fork of app-board-RGB by Chris Styles

Test Program to show the RGB Led on the mbed Lab Board

The color is changed by Pot 2, the value by Pot 1.

The program use a function to convert hue , saturation and value to RGB.

With this parameters you can change the color thru the rainbow. see http://en.wikipedia.org/wiki/HSL_and_HSV

main.cpp@1:670665e77763, 2012-10-20 (annotated)

Committer:
dreschpe
Date:
Sat Oct 20 00:21:54 2012 +0000
Revision:
1:670665e77763
Parent:
0:f86c572491c3
Child:
2:52c13333401e
Test program for the RGB led on the mbed Lab Board V1.0;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 1:670665e77763 1 /**
dreschpe 1:670665e77763 2 * Demo for the RGB Led on the mbed Lab Board
dreschpe 1:670665e77763 3 * Pot 2 changes the color
dreschpe 1:670665e77763 4 * Pot 1 changes the value
dreschpe 1:670665e77763 5 * the saturation is set to maximum
dreschpe 1:670665e77763 6 *
dreschpe 1:670665e77763 7 * Copyright (c) 2012 Peter Drescher - DC2PD
dreschpe 1:670665e77763 8 */
dreschpe 1:670665e77763 9
dreschpe 1:670665e77763 10
chris 0:f86c572491c3 11 #include "mbed.h"
dreschpe 1:670665e77763 12 #include "Small_7.h"
dreschpe 1:670665e77763 13 #include "Arial_9.h"
dreschpe 1:670665e77763 14 #include "stdio.h"
dreschpe 1:670665e77763 15 #include "C12832_lcd.h"
chris 0:f86c572491c3 16
dreschpe 1:670665e77763 17 /* the led's are connected to vcc, so a PwmOut of 100% will shut off the led and 0% will let it shine ! */
chris 0:f86c572491c3 18 PwmOut r (p23);
chris 0:f86c572491c3 19 PwmOut g (p24);
chris 0:f86c572491c3 20 PwmOut b (p25);
chris 0:f86c572491c3 21
dreschpe 1:670665e77763 22 // LCD object
dreschpe 1:670665e77763 23 C12832_LCD LCD("LCD");
dreschpe 1:670665e77763 24
dreschpe 1:670665e77763 25 AnalogIn Pot1(p19);
dreschpe 1:670665e77763 26 AnalogIn Pot2(p20);
dreschpe 1:670665e77763 27
dreschpe 1:670665e77763 28 // function to convert hue , saturation and value to RGB
dreschpe 1:670665e77763 29 // see http://en.wikipedia.org/wiki/HSL_and_HSV
dreschpe 1:670665e77763 30 void hsv2rgb(float H,float S, float V)
dreschpe 1:670665e77763 31 {
dreschpe 1:670665e77763 32 float f,h,p,q,t;
dreschpe 1:670665e77763 33 int i;
dreschpe 1:670665e77763 34 if( S == 0.0) {
dreschpe 1:670665e77763 35 r = 1.0 - V; // invert pwm !
dreschpe 1:670665e77763 36 g = 1.0 - V;
dreschpe 1:670665e77763 37 b = 1.0 - V;
dreschpe 1:670665e77763 38 return;
dreschpe 1:670665e77763 39 }
dreschpe 1:670665e77763 40 if(H > 360.0) H = 0.0; // check values
dreschpe 1:670665e77763 41 if(S > 1.0) S = 1.0;
dreschpe 1:670665e77763 42 if(S < 0.0) S = 0.0;
dreschpe 1:670665e77763 43 if(V > 1.0) V = 1.0;
dreschpe 1:670665e77763 44 if(V < 0.0) V = 0.0;
dreschpe 1:670665e77763 45 h = H / 60.0;
dreschpe 1:670665e77763 46 i = (int) h;
dreschpe 1:670665e77763 47 f = h - i;
dreschpe 1:670665e77763 48 p = V * (1.0 - S);
dreschpe 1:670665e77763 49 q = V * (1.0 - (S * f));
dreschpe 1:670665e77763 50 t = V * (1.0 - (S * (1.0 - f)));
dreschpe 1:670665e77763 51
dreschpe 1:670665e77763 52 switch(i) {
dreschpe 1:670665e77763 53 case 0:
dreschpe 1:670665e77763 54 r = 1.0 - V; // invert pwm !
dreschpe 1:670665e77763 55 g = 1.0 - t;
dreschpe 1:670665e77763 56 b = 1.0 - p;
dreschpe 1:670665e77763 57 break;
dreschpe 1:670665e77763 58 case 1:
dreschpe 1:670665e77763 59 r = 1.0 - q;
dreschpe 1:670665e77763 60 g = 1.0 - V;
dreschpe 1:670665e77763 61 b = 1.0 - p;
dreschpe 1:670665e77763 62 break;
dreschpe 1:670665e77763 63 case 2:
dreschpe 1:670665e77763 64 r = 1.0 - p;
dreschpe 1:670665e77763 65 g = 1.0 - V;
dreschpe 1:670665e77763 66 b = 1.0 - t;
dreschpe 1:670665e77763 67 break;
dreschpe 1:670665e77763 68 case 3:
dreschpe 1:670665e77763 69 r = 1.0 - p;
dreschpe 1:670665e77763 70 g = 1.0 - q;
dreschpe 1:670665e77763 71 b = 1.0 - V;
dreschpe 1:670665e77763 72 break;
dreschpe 1:670665e77763 73 case 4:
dreschpe 1:670665e77763 74 r = 1.0 - t;
dreschpe 1:670665e77763 75 g = 1.0 - p;
dreschpe 1:670665e77763 76 b = 1.0 - V;
dreschpe 1:670665e77763 77 break;
dreschpe 1:670665e77763 78 case 5:
dreschpe 1:670665e77763 79 default:
dreschpe 1:670665e77763 80 r = 1.0 - V;
dreschpe 1:670665e77763 81 g = 1.0 - p;
dreschpe 1:670665e77763 82 b = 1.0 - q;
dreschpe 1:670665e77763 83 break;
dreschpe 1:670665e77763 84 }
dreschpe 1:670665e77763 85 }
dreschpe 1:670665e77763 86
dreschpe 1:670665e77763 87
chris 0:f86c572491c3 88 int main()
chris 0:f86c572491c3 89 {
dreschpe 1:670665e77763 90 float h; // hue
dreschpe 1:670665e77763 91 float s,v; // saturation and value;
dreschpe 1:670665e77763 92 float temp,temp2;
dreschpe 1:670665e77763 93 r.period(0.001); // set pwm period
dreschpe 1:670665e77763 94
dreschpe 1:670665e77763 95 LCD.claim(stdout); // send stdout to the LCD display
dreschpe 1:670665e77763 96 LCD.cls();
dreschpe 1:670665e77763 97 LCD.locate(10,0);
dreschpe 1:670665e77763 98 LCD.set_font((unsigned char*) Arial_9);
dreschpe 1:670665e77763 99 printf("RGB Led Demo");
dreschpe 1:670665e77763 100 LCD.set_font((unsigned char*) Small_7);
dreschpe 1:670665e77763 101 s = 1.0;
dreschpe 1:670665e77763 102 for(;;){
dreschpe 1:670665e77763 103 // get Poti 1 for color
dreschpe 1:670665e77763 104 temp = Pot1.read();
dreschpe 1:670665e77763 105 temp2 = Pot1.read();
dreschpe 1:670665e77763 106 h = (temp + temp2) * 180;
dreschpe 1:670665e77763 107 LCD.locate(0,13);
dreschpe 1:670665e77763 108 printf("Colour = %3.2f ",h);
dreschpe 1:670665e77763 109 // get Poti 2 fo value
dreschpe 1:670665e77763 110 temp = Pot2.read();
dreschpe 1:670665e77763 111 temp2 = Pot2.read();
dreschpe 1:670665e77763 112 v = (temp + temp2) / 2;
dreschpe 1:670665e77763 113 LCD.locate(0,23);
dreschpe 1:670665e77763 114 printf("Val = %01.3f ",v);
dreschpe 1:670665e77763 115 LCD.copy_to_lcd();
dreschpe 1:670665e77763 116 hsv2rgb(h,s,v);
dreschpe 1:670665e77763 117 wait_ms(500);
chris 0:f86c572491c3 118 }
chris 0:f86c572491c3 119 }