Rocky-Based HTTP API for RGB LEDs

lightApi.agent.nut

// AGENT CODE

#require "rocky.class.nut:1.2.2"

// instantiate the Rocky framework for our API
app <- Rocky();

// say hello if someone requests our Agent URL
app.get("/", function(context) {
    context.send("Try adding a color (red, green, blue) to the path!");
});

app.get("/red", function(context) {
    device.send("setcolor", [50, 0, 0]);
    context.send("Color set to Red!");
});

app.get("/green", function(context) {
    device.send("setcolor", [0, 50, 0]);
    context.send("Color set to Green!");
});

app.get("/blue", function(context) {
    device.send("setcolor", [0, 0, 50]);
    context.send("Color set to Blue!");
});




// Just for fun: decoding hex colors

// ascii hex digit to decimal
function hexdec(c) {
    if (c <= '9') {
        server.log(c - '0');
        return c - '0';
    } else {
        server.log(0x0A + c - 'A');
        return 0x0A + c - 'A';
    }
}

function decodeColorString(colorString) {
    colorString = colorString.toupper();
    local rStr = colorString.slice(1,3);
    local gStr = colorString.slice(3,5);
    local bStr = colorString.slice(5,7);
    
    local red = (hexdec(rStr[0]) * 16) + hexdec(rStr[1]);
    local green = (hexdec(gStr[0]) * 16) + hexdec(gStr[1]);
    local blue = (hexdec(bStr[0]) * 16) + hexdec(bStr[1]);

    local rgb = [red, green, blue];
    return rgb;
}

app.get("/[a-f0-9]{6}", function(context) {
    local color = decodeColorString(context.matches[0]);
    device.send("setcolor", color);
    context.send(("Set Color to (%d, %d, %d)", color));
});

lightApi.device.nut

// DEVICE CODE

#require "ws2812.class.nut:2.0.1"

// create a SPI object to use to control the WS2812 LEDs
spi <- hardware.spi257;
// configure SPI to run at 7.5 MHz
spi.configure(MSB_FIRST, 7500);

// instantiate WS2812 class to create object for our 5 LEDs
leds <- WS2812(spi, 5);

// fill frame buffer with green pixels to test LEDs
// red brightness: 0/255, green: 50/255, blue: 0/255 
leds.fill([0, 50, 0]);
// write out frame buffer
leds.draw();

// register agent callback for "setcolor" event
agent.on("setcolor", function(color) { 
    leds.fill(color);
    leds.draw();
});