dhavalgujar / iot-workshop

Examples for Arduino Workshop

1. Hello World
2. Blink [What was added in this step?]
3. Push Button
4. Push Button with LED [What was added in this step?]
5. Rainmaker Basic Switch
6. Rainmaker LED with RGB controls [What was added in this step?]
7. Rainmaker LED with HSV controls (VA supported) [What was added in this step?]

Get comfortable with abstractions

Not the right way to get comfortable with abstractions ;)

Helper functions:

HSV to RGB

static void convertHSVtoRGB(int h, int s, int v, int *r, int *g, int *b)
{
    h %= 360; // h -> [0,360]
    uint32_t rgb_max = v * 2.55f;
    uint32_t rgb_min = rgb_max * (100 - s) / 100.0f;
    uint32_t i = h / 60;
    uint32_t diff = h % 60;
    // RGB adjustment amount by hue
    uint32_t rgb_adj = (rgb_max - rgb_min) * diff / 60;
    switch (i) {
    case 0:
        *r = rgb_max;
        *g = rgb_min + rgb_adj;
        *b = rgb_min;
        break;
    case 1:
        *r = rgb_max - rgb_adj;
        *g = rgb_max;
        *b = rgb_min;
        break;
    case 2:
        *r = rgb_min;
        *g = rgb_max;
        *b = rgb_min + rgb_adj;
        break;
    case 3:
        *r = rgb_min;
        *g = rgb_max - rgb_adj;
        *b = rgb_max;
        break;
    case 4:
        *r = rgb_min + rgb_adj;
        *g = rgb_min;
        *b = rgb_max;
        break;
    default:
        *r = rgb_max;
        *g = rgb_min;
        *b = rgb_max - rgb_adj;
        break;
    }
}

Comic courtesy of Abtruse Goose