weather-station/Arduino/outdoor-weather-station/01_leds.ino

#include <Adafruit_DotStar.h>

#define NUM_DOTSTAR 5
#define PROGRESS_NUM_STATES 10

Adafruit_DotStar pixels(
	NUM_DOTSTAR,
	PIN_DOTSTAR_DATA,
	PIN_DOTSTAR_CLOCK,
	DOTSTAR_BRG
);

boolean ledsShowingProgress = false;
int ledProgress = 0;

const uint32_t PROGRESS_BLUE = pixels.Color(0, 0, 255),
			   PROGRESS_GREEN = pixels.Color(255, 0, 0),
			   PROGRESS_RED = pixels.Color(0, 255, 0);

// Which LEDs should be lit up for a given position in the progress.
// This could be calculated, but I have memory to spare, and this is
// easier at the moment.
uint16_t ledProgressMap[PROGRESS_NUM_STATES] = {
	0b00000,
	0b00001,
	0b00011,
	0b00111,
	0b01111,
	0b11111,
	0b11110,
	0b11100,
	0b11000,
	0b10000
};

void initLeds() {
	pixels.begin();
	pixels.show();
	pixels.setBrightness(2);

	hideProgress();
}

// Update LEDs to show loading, such as connecting to wifi
void showProgress(uint32_t colour) {
	if(!ledsShowingProgress) {
		// Reset the progress display
		ledProgress = 0;
		ledsShowingProgress = true;
	}

	ledProgress = (ledProgress + 1) % PROGRESS_NUM_STATES;

	for(byte i = 0; i < NUM_DOTSTAR; i++) {
		boolean on = ((1 << i) & ledProgressMap[ledProgress]) > 0;
		pixels.setPixelColor(
				i,
				on ? colour : 0
			);
	}

	pixels.show();
}

// Turn off the LEDs
void hideProgress() {
	ledsShowingProgress = false;
	for(byte i = 0; i < NUM_DOTSTAR; i++) {
		pixels.setPixelColor(i, 0); 
	}
	pixels.show();
}

void showError() {
	pixels.fill(PROGRESS_RED);
	pixels.show();
}