// Libraries
#include <Adafruit_NeoPixel.h>
#include <ButtonStates.h>
#include <math.h>

// Pin definition
#define buttonPin 1
#define microPin 2
#define thermistorPin 3
#define phototransistorPin 4
#define pixelPin 8
#define ledPin 19

Adafruit_NeoPixel pixels(1, pixelPin, NEO_GRB + NEO_KHZ800);
ButtonStates button(buttonPin);

void setup() {
  // Serial communication via USB
  Serial.begin(115200);

  // Pin instanciation (digital only)
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);

  // Neopixel
  pixels.begin();
  pixels.clear();
  pixels.show();
}

void loop() {
  int microOut;
  microOut = mems();
//  memsPlotter(microOut);

  float temp;
  temp = temperature();
  
  int lum;
  lum = luminosity();

  printValues(microOut, temp, lum);

  // Clear the pixel
  int clicks = button.triggerLong();
  switch(clicks) {
    case 1:
      lightPixel(0,127,0);
      break;
    case 2:
      clearPixel();
      break;
  }
}

int mems() {
  int micOut;
  micOut = analogRead(microPin);
  return micOut;
}

void memsPlotter(int micOut) {
  Serial.println(micOut);
  delay(50);
}

float temperature() {
  // From https://circuitdigest.com/microcontroller-projects/arduino-thermistor-interfacing-code-circuit
  float vOut;
  float A = 1.009249522e-03, B = 2.378405444e-04, C = 2.019202697e-07;
  float tempKelvin, logRt, tempCelsius, tempFarhenheit;
  
  vOut = analogRead(thermistorPin);
  logRt = log(10000.0 * ((1024.0 / vOut - 1)));
  tempKelvin = (1.0 / (A + B * logRt + C * logRt * logRt * logRt));
  tempCelsius = tempKelvin - 273.15;
//  tempFarhenheit = (tempCelsius * 1.8) + 32.0;
  
  return tempCelsius;
}

int luminosity() {
  int lum;
  lum = analogRead(phototransistorPin);
  lum = map(lum, 0, 1024, 255, 0);
  return lum;
}

void printValues(int microValue, int tempValue, int lumValue) {
  // Micro
  Serial.print("Micro: ");
  Serial.println(microValue);

  // Thermistor
  Serial.print("Temperature: ");
  Serial.println(tempValue);

  // Phototransistor
  Serial.print("Luminosity: ");
  Serial.println(lumValue);

  delay(50);
}

void lightPixel(int r, int g, int b) {
  pixels.fill(pixels.Color(r, g, b));
  pixels.show();
}

void clearPixel() {
  pixels.fill(pixels.Color(0,0,0));
  pixels.show();
}

void blinkPixel(int r, int g, int b) {
  lightPixel(r, g, b);
  delay(500);
  clearPixel();
  delay(500);  
}