#include <HX711.h> //This library can be obtained here http://librarymanager/All#Avia_HX711
#include <Wire.h>
//#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//OLED
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define calibration_factor 375 //This value is obtained using the SparkFun_HX711_Calibration sketch for 44lbs
//46050.0
#define LOADCELL_DOUT_PIN  33
#define LOADCELL_SCK_PIN  32

const int buttonPin = 26; 
int buttonState = 0;

//float loadcellread ;
float loadcellread, max_load;

HX711 scale;

void setup() {
  Serial.begin(9600);
  pinMode(10, OUTPUT);
  pinMode(buttonPin, INPUT);
 // Serial.println("HX711 scale demo");

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
    //Assuming there is no weight on the scale at start up, reset the scale to 0

//  Serial.println("Readings:");
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  max_load = -999999.0; // set initial max load value to a very small value
}

void displayloadcell() {
  buttonState = digitalRead(buttonPin);
  loadcellread = scale.get_units() ;
  //Print the weight value to the serial monitor
 // Serial.print("Weight: ");
  //Serial.println(loadcellread); //0.453592
//  Serial.println(" kg");

if (loadcellread > max_load) {
    max_load = loadcellread;
  }
/*
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print("      PULL FORCE");
  display.setCursor(10, 9);
  display.setTextSize(3);
  display.print(loadcellread);
  display.setTextSize(1.7);
  display.print (" kg");
*/
    // OLED Display
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(2);
  display.setCursor(0, 0);
  display.print("W: ");
  display.print(loadcellread, 2);
  Serial.print("W: ");
  Serial.println(loadcellread, 2);
   display.setTextSize(1.2);
  display.setCursor(0, 30);
  display.print("Max: ");
  display.print(max_load, 2);
  Serial.print("Max: ");
  Serial.print(max_load, 2);

}

void reset (){
if (buttonState == LOW) {
    scale.tare();
    Serial.print("button_pressed");
  }
}


void loop() {

if (buttonState == 0){
  display.clearDisplay();
  display.setTextSize(2);
  display.setCursor(0, 0);
  display.print("Reseting");
  reset();
}
  displayloadcell();
  display.display();
delay(50);
}