David Grayson / Mbed 2 deprecated LedStripRainbow

This is an example program for the PololuLedStrip library. It generates a simple moving rainbow pattern.

Dependencies:   PololuLedStrip mbed

For more information, see the PololuLedStrip library.

main.cpp@7:050f086f6f5c, 2017-11-01 (annotated)

Committer:
DavidEGrayson
Date:
Wed Nov 01 23:15:43 2017 +0000
Revision:
7:050f086f6f5c
Parent:
6:0882f93da02f 
Update libraries to latest versions.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DavidEGrayson 0:a3a9c486fc68 1 #include "mbed.h"
DavidEGrayson 0:a3a9c486fc68 2 #include "PololuLedStrip.h"
DavidEGrayson 0:a3a9c486fc68 3
DavidEGrayson 4:101a39472379 4 PololuLedStrip ledStrip(D8);
DavidEGrayson 0:a3a9c486fc68 5
DavidEGrayson 6:0882f93da02f 6 #define LED_COUNT 60
DavidEGrayson 0:a3a9c486fc68 7 rgb_color colors[LED_COUNT];
DavidEGrayson 0:a3a9c486fc68 8
DavidEGrayson 0:a3a9c486fc68 9 Timer timer;
DavidEGrayson 0:a3a9c486fc68 10
DavidEGrayson 0:a3a9c486fc68 11 // Converts a color from the HSV representation to RGB.
DavidEGrayson 0:a3a9c486fc68 12 rgb_color hsvToRgb(float h, float s, float v)
DavidEGrayson 0:a3a9c486fc68 13 {
DavidEGrayson 0:a3a9c486fc68 14 int i = floor(h * 6);
DavidEGrayson 0:a3a9c486fc68 15 float f = h * 6 - i;
DavidEGrayson 0:a3a9c486fc68 16 float p = v * (1 - s);
DavidEGrayson 0:a3a9c486fc68 17 float q = v * (1 - f * s);
DavidEGrayson 0:a3a9c486fc68 18 float t = v * (1 - (1 - f) * s);
DavidEGrayson 2:69cc4148a7fa 19 float r = 0, g = 0, b = 0;
DavidEGrayson 0:a3a9c486fc68 20 switch(i % 6){
DavidEGrayson 0:a3a9c486fc68 21 case 0: r = v; g = t; b = p; break;
DavidEGrayson 0:a3a9c486fc68 22 case 1: r = q; g = v; b = p; break;
DavidEGrayson 0:a3a9c486fc68 23 case 2: r = p; g = v; b = t; break;
DavidEGrayson 0:a3a9c486fc68 24 case 3: r = p; g = q; b = v; break;
DavidEGrayson 0:a3a9c486fc68 25 case 4: r = t; g = p; b = v; break;
DavidEGrayson 0:a3a9c486fc68 26 case 5: r = v; g = p; b = q; break;
DavidEGrayson 0:a3a9c486fc68 27 }
DavidEGrayson 0:a3a9c486fc68 28 return (rgb_color){r * 255, g * 255, b * 255};
DavidEGrayson 0:a3a9c486fc68 29 }
DavidEGrayson 0:a3a9c486fc68 30
DavidEGrayson 0:a3a9c486fc68 31 int main()
DavidEGrayson 0:a3a9c486fc68 32 {
DavidEGrayson 0:a3a9c486fc68 33 timer.start();
DavidEGrayson 0:a3a9c486fc68 34
DavidEGrayson 0:a3a9c486fc68 35 while(1)
DavidEGrayson 0:a3a9c486fc68 36 {
DavidEGrayson 0:a3a9c486fc68 37 // Update the colors array.
DavidEGrayson 1:3d89bcd21002 38 uint32_t time = timer.read_ms();
DavidEGrayson 0:a3a9c486fc68 39 for(int i = 0; i < LED_COUNT; i++)
DavidEGrayson 0:a3a9c486fc68 40 {
DavidEGrayson 0:a3a9c486fc68 41 uint8_t phase = (time >> 4) - (i << 2);
DavidEGrayson 0:a3a9c486fc68 42 colors[i] = hsvToRgb(phase / 256.0, 1.0, 1.0);
DavidEGrayson 0:a3a9c486fc68 43 }
DavidEGrayson 0:a3a9c486fc68 44
DavidEGrayson 0:a3a9c486fc68 45 // Send the colors to the LED strip.
DavidEGrayson 0:a3a9c486fc68 46 ledStrip.write(colors, LED_COUNT);
DavidEGrayson 0:a3a9c486fc68 47 }
DavidEGrayson 0:a3a9c486fc68 48 }