// Setup for motor
int PWMA = 6;        
int AIN1 = 5;
int AIN2 = 4;

// Setup for LCD
#include <LiquidCrystal.h>
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

// Setup for temperature sensor
float voltage;
float degreesC;
float degreesF;

// Setup for averaging 
const int Numreadings = 20;
float readings[20];
int i=0;

void setup() {
  Serial.begin(9600);

  lcd.begin(16, 2);
  lcd.clear(); 

  pinMode(PWMA, OUTPUT); 
  pinMode(AIN1, OUTPUT); 
  pinMode(AIN2, OUTPUT); 
  
  // Reading for array
  for (int i=0; i < Numreadings; i++) {
    readings[i] = 0;
  }
}

void loop() {
  // Read temperature
  voltage = analogRead(A0) * 0.004882813;
  degreesC = (voltage - 0.5) * 100;
  degreesF = degreesC * 9.0 / 5.0 + 32;
  
  // Store readings in array
  readings[i] = degreesF; i++;
  if (i >= Numreadings) {
    i = 0;
  }
  
  // Calculate average
  float sum = 0;
  for (int i=0; i<Numreadings; i++){
    sum += readings[i];
  }
  float avgTemp = sum/Numreadings;

  // Display temperature on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("The temperature");
  lcd.setCursor(3, 1);
  lcd.print("is: ");
  lcd.print(avgTemp, 1);
  lcd.print((char)223);
  lcd.print("F");

  // Print to Serial Monitor
  Serial.print("Temperature (F): ");
  Serial.println(avgTemp);

  // Control motor speed based on temperature
  if (degreesF < 60) {
    analogWrite(PWMA, 0); // Motor off
    digitalWrite(AIN1, LOW);
    digitalWrite(AIN2, HIGH);
    Serial.println("Motor: OFF");
  } 
  else if (degreesF < 70) {
    analogWrite(PWMA, 100); // Low speed
    digitalWrite(AIN1, LOW);
    digitalWrite(AIN2, HIGH);
    Serial.println("Motor: Low Speed");
  } 
  else if (degreesF < 80) {
    analogWrite(PWMA, 175); // Medium speed
    digitalWrite(AIN1, LOW);
    digitalWrite(AIN2, HIGH);
    Serial.println("Motor: Medium Speed");
  } 
  else {
    analogWrite(PWMA, 255); // High speed
    digitalWrite(AIN1, LOW);
    digitalWrite(AIN2, HIGH);
    Serial.println("Motor: High Speed");
  }

  delay(1000);
}