/*
www.engineer2you.com
Last modification: 28/09/2019
*/
#include <Adafruit_MLX90614.h>  //for infrared thermometer
#include <Adafruit_GFX.h>       // Include core graphics library for the display
#include <Adafruit_SSD1306.h>   // Include Adafruit_SSD1306 library to drive the display
#include <Fonts/FreeMonoBold18pt7b.h>  // Add a custom font

Adafruit_SSD1306 display(128, 64);            //Create display
Adafruit_MLX90614 mlx = Adafruit_MLX90614();  //for infrared thermometer
int temp;  // Create a variable to have something dynamic to show on the display

void setup()
{                
  delay(100);  // This delay is needed to let the display to initialize
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // Initialize display with the I2C address of 0x3C
  display.clearDisplay();  // Clear the buffer
  display.setTextColor(WHITE);  // Set color of the text
  mlx.begin();  //start infrared thermometer
}

void loop()
{
  temp++;  // Increase value for testing
  if(temp > 43)  // If temp is greater than 150
  {
    temp = 0;  // Set temp to 0
  }

  temp = mlx.readObjectTempC(); //comment this line if you want to test

  display.clearDisplay();  // Clear the display so we can refresh

  // Print text:
  display.setFont();
  display.setCursor(45,10);  // (x,y)
  display.println("TEMPERATURE");  // Text or value to print

  // Print temperature
  char string[10];  // Create a character array of 10 characters
  // Convert float to a string:
  dtostrf(temp, 3, 0, string);  // (<variable>,<amount of digits we are going to use>,<amount of decimal digits>,<string name>)
  
  display.setFont(&FreeMonoBold18pt7b);  // Set a custom font
  display.setCursor(20,50);  // (x,y)
  display.println(string);  // Text or value to print
  display.setCursor(90,50);  // (x,y)
  display.println("C");  // Text or value to print
  display.setCursor(77,32);  // (x,y)
  display.println(".");  // Text or value to print
  
  // Draw a filled circle:
  display.fillCircle(18, 55, 7, WHITE);  // Draw filled circle (x,y,radius,color). X and Y are the coordinates for the center point

  // Draw rounded rectangle:
  display.drawRoundRect(16, 3, 5, 49, 2, WHITE);  // Draw rounded rectangle (x,y,width,height,radius,color)
                                                  // It draws from the location to down-right
    // Draw ruler step
  for (int i = 6; i<=45; i=i+3){
    display.drawLine(21, i, 22, i, WHITE);  // Draw line (x0,y0,x1,y1,color)
  }
  
  //Draw temperature
  temp = temp*0.43; //ratio for show
  display.drawLine(18, 46, 18, 46-temp, WHITE);  // Draw line (x0,y0,x1,y1,color)

  display.display();  // Print everything we set previously

}