/*
  Credits:
  OLED library for Oled
    Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
  HX711 library for load cell amplifier
    Bogde HX711 lib (https://github.com/bogde/HX711)
  Button library 
    Mathertel OneButtonlib (https://github.com/mathertel/OneButton)
*/
#include <Arduino.h>
#include <U8g2lib.h>
#include <SPI.h>
#include <OneButton.h>
#include "HX711.h"
HX711 scale1;
HX711 scale2;
#define DOUT1  A0                                   //Pin 2 and 3 to connect HX711 load cell amplifier
#define CLK1  A1                                    //
#define DOUT2  A2                                   //Pin 2 and 3 to connect HX711 load cell amplifier
#define CLK2  A3                                    //
OneButton buttonTare(4, true);                    //Digital pin 3 for Tare button
OneButton buttonWeight(5, true);                  //Digital pin 4 for Weight button
OneButton buttonSpine(6, true);                   //Digital pin 5 for Spine button
OneButton buttonFoc(7, true);                     //Digital pin 5 for FOC button
float calibration_factor_1 = 420;                 //Value calculated from calibration of digital scale. Standard values in grams
float calibration_factor_2 = 420;                 //Value calculated from calibration of digital scale. Standard values in grams
float baseWeight = 0.0;                           //To store shaft weight
float spineWeight = 0.0;                          //To store weight for spine measurement
float foc = 0.0;                                  //To store FOC
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0); //Initialize the proper oled. See library sample for the correct one.
void setup(void) {
  u8g2.begin();                                   //Initialize display
  scale1.begin(DOUT1, CLK1);                      //Initialize scale1
  scale2.begin(DOUT2, CLK2);                      //Initialize scale1
  scale1.set_scale(calibration_factor_1);         //Adjust to the calibration factor (here 456)
  scale2.set_scale(calibration_factor_2);         //Adjust to the calibration factor (here 456)
  buttonTare.attachClick(click1);                 //-----------------------------------------------
  buttonWeight.attachClick(click2);               //..buttons actions
  buttonSpine.attachClick(click3);                //-----------------------------------------------
  buttonFoc.attachClick(click4);
  u8g2.clearBuffer();                             //Clear the internal buffer
  u8g2.setFont(u8g2_font_t0_16_tr);          //Choose a font before position cursor and print
  u8g2.setCursor(15, 16);                          //Set cursor position
  u8g2.print("Arcieri di");                            //Print But3 to indicate to click the third button
  u8g2.setCursor(33, 32);                         //Change cursor position
  u8g2.print("Ascoli");
  u8g2.sendBuffer();                              //Transfer internal memory to the display
}

void loop(void) {
  buttonTare.tick();                              //-----------------------------------------------
  buttonWeight.tick();                            //Read button state
  buttonSpine.tick();
  buttonFoc.tick();                               //-----------------------------------------------
}

void click1() {                                   //Event simple click for TARE before spine (button 3)
  scale1.tare();                                  //Tare  scale 1
  scale2.tare();                                  //Tare  scale 2  
  u8g2.clearBuffer();                             //Clear the internal buffer
  u8g2.setFont(u8g2_font_logisoso28_tr);          //Choose a font before position cursor and print
  u8g2.setCursor(15, 32);                          //Set cursor position
  u8g2.print("READY");                            //Print 0.00 with two decimals
  u8g2.setFont(u8g2_font_t0_16_tr);               //Change font
  u8g2.sendBuffer();                              //Transfer internal memory to the display
}

void click2() {                                   //Event click for Weight
  baseWeight=(scale1.get_units(10) + scale2.get_units(10))*15432,4;                 //Average of ten readings 
  u8g2.clearBuffer();                             
  u8g2.setFont(u8g2_font_logisoso28_tr);   
  u8g2.setCursor(5, 32);                   
  u8g2.print(baseWeight, 0);                      //Print shaft weight with two decimals
  u8g2.setFont(u8g2_font_t0_16_tr);
  u8g2.setCursor(85, 24);
  u8g2.print("Grani");                      //Print resume of the shaft weight
  u8g2.sendBuffer();                       
}
void click3() {                                   //Event click for Spine
  float localWeight=0.0;                          //Variable to store the weight for spine calc
  localWeight=scale1.get_units(10) + scale2.get_units(10);
  spineWeight=((localWeight-0.521980143)*60/1.565940428)+20;      //Formula to calculate the spine. It depends from maximum bending
  u8g2.clearBuffer();                      
  u8g2.setFont(u8g2_font_logisoso28_tr);   
  u8g2.setCursor(5, 32);                   
  u8g2.print(spineWeight, 0);                     //Print shaft spine with two decimals
  u8g2.print(" #");
  u8g2.setFont(u8g2_font_t0_16_tr);
  u8g2.setCursor(85, 16);
  u8g2.print(baseWeight, 0);                      //Print resume of the shaft weight
  u8g2.setCursor(85, 32);
  u8g2.print("Grani");                     //Print resume of the shaft spine
  u8g2.sendBuffer();                       
}
void click4() {                                   //Event click for FOC
  foc = (scale2.get_units(10) - scale1.get_units(10))/2*100;
  u8g2.clearBuffer();                             
  u8g2.setFont(u8g2_font_logisoso28_tr);   
  u8g2.setCursor(5, 32);                   
  u8g2.print(foc, 0.0);                     //Print shaft spine with two decimals
  u8g2.print("%");
  u8g2.setFont(u8g2_font_t0_16_tr);
  u8g2.setCursor(85, 16);
  u8g2.print(baseWeight, 0);                      //Print resume of the shaft weight
  u8g2.print("gr");
  u8g2.setFont(u8g2_font_t0_16_tr);
  u8g2.setCursor(85, 32);
  u8g2.print(spineWeight, 0);
  u8g2.print(" #");
  u8g2.sendBuffer();                     //Print resume of the shaft spine
  }