/***
 *       ____ ___ ____       _                         _
 *      / ___/ _ \___ \     / \   _ __ ___  _ __   ___| |
 *     | |  | | | |__) |   / _ \ | '_ ` _ \| '_ \ / _ \ |
 *     | |__| |_| / __/   / ___ \| | | | | | |_) |  __/ |
 *      \____\___/_____| /_/__ \_\_| |_| |_| .__/ \___|_|         _
 *     | | | |/ _|_   _| / ___|| |_ _   _| |_| |_ __ _  __ _ _ __| |_
 *     | |_| | |_  | |   \___ \| __| | | | __| __/ _` |/ _` | '__| __|
 *     |  _  |  _| | |    ___) | |_| |_| | |_| || (_| | (_| | |  | |_
 *     |_| |_|_|   |_|   |____/ \__|\__,_|\__|\__\__, |\__,_|_|   \__|
 *                                               |___/
 */

// Small example, with CO2 sensor and LED ring.
// Required libraries:
//  LED Ring:
#include "src/lib/Adafruit_NeoPixel/Adafruit_NeoPixel.h"
//  CO2 sensor:
#include "src/lib/SparkFun_SCD30_Arduino_Library/src/SparkFun_SCD30_Arduino_Library.h"
#include <Wire.h>

// How many LEDs on the ring?
const int LED_COUNT = 12;
// Where is LED ring connected to micro-controller?
const int NEOPIXELS_PIN = 5;

// Define LED ring and CO2 sensor
Adafruit_NeoPixel led_ring(LED_COUNT, NEOPIXELS_PIN, NEO_GRB + NEO_KHZ800);
SCD30 sensor;

// Define variables
int which_led;
uint16_t co2;

// The code in setup() will be run once, at startup.
void setup() {
  // Transmission speed
  Serial.begin(115200);

  // Initialize LED ring.
  led_ring.begin();
  led_ring.setBrightness(255);

  // Initialize sensor (should be connected to D6 & D5), without auto-calibration.
  Wire.begin(12, 14);
  sensor.begin(false);

  // One measurement every 10s
  sensor.setMeasurementInterval(10);
}

// The code in loop() will be run as long as the micro-controller is powered up, in an infinite loop.
void loop() {
  if (sensor.dataAvailable()) {
    // New measurement is available. Let's display it!
    co2 = sensor.getCO2();
    Serial.print("CO2 : ");
    Serial.print(co2);
    Serial.println(" ppm.");
  }

  // Light the next LED
  which_led = which_led + 1;
  // Come back to first LED if needed.
  if (which_led >= LED_COUNT) {
    which_led = 0;
  }

  // First, disable every LED
  led_ring.clear();
  // Check if air is good enough
  if (co2 <= 1000) {
    // Light the LED green if CO2 ppm is low
    //                   position, red, green, blue
    led_ring.setPixelColor(which_led, 0, 255, 0);
  } else {
    // Red otherwise.
    //                   position, red, green, blue
    led_ring.setPixelColor(which_led, 255, 0, 0);
  }
  led_ring.show();

  // Wait half a second before next loop.
  // Micro-controller might crash if it has too much work to do. Please don't remove it!
  delay(500);
}