/*
  Source: https://www.electroschematics.com/pressure-sensor-guide/
*/
#include <HX711.h>
#include <LiquidCrystal_I2C.h>
#include <AccelStepper.h>

const int dirPin = 2;
const int stepPin = 3;
const byte dout_pin = A1;
const byte sck_pin = A0;
unsigned long prevTime = 0;
float motorSpeed = 0;
float sensorReading = 0;

HX711 scale; //  define object called scale
LiquidCrystal_I2C lcd(0x27, 16, 2);

AccelStepper myStepper(AccelStepper::DRIVER, stepPin, dirPin); //define object as myStepper
void setup() {
  Serial.begin(115200);

   pinMode(dirPin, OUTPUT);
   pinMode(stepPin, OUTPUT);
   pinMode(dout_pin, INPUT);
   pinMode(sck_pin, INPUT);

     //digitalWrite(dirPin, HIGH);
     
   lcd.begin(16,2);
   lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("HX711 Demo with");
   lcd.setCursor(0,1);
   lcd.print("HX711 Library");
    delay(1500);
   lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("Initializing");
   lcd.setCursor(0,1);
   lcd.print("the scale");
   delay (1500);
   lcd.clear();

  // parameter "gain" is ommited; the default value 128 is used by the library
  // HX711.DOUT   - pin #A1
  // HX711.PD_SCK - pin #A0

  scale.begin(dout_pin, sck_pin);

  Serial.println("Before setting up the scale:");
  Serial.print("read: \t\t");
  Serial.println(scale.read());                  // print a raw reading from the ADC
  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));        // print the average of 20 readings from the ADC
  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));            // print the average of 5 readings from the ADC minus the tare weight (not set yet)
  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);         // print the average of 5 readings from the ADC minus tare weight (not set) divided

  // by the SCALE parameter (not set yet)
  scale.set_scale(420.f);  //2280.f                     // this value is obtained by calibrating the scale with known weights; see the README for details
  scale.tare();                                  // reset the scale to 0

  Serial.println("After setting up the scale:");
  Serial.print("read: \t\t");
  Serial.println(scale.read());                  // print a raw reading from the ADC
  Serial.print("read average: \t\t");
  Serial.println(scale.read_average(20));        // print the average of 20 readings from the ADC
  Serial.print("get value: \t\t");
  Serial.println(scale.get_value(5));            // print the average of 5 readings from the ADC minus the tare weight, set with tare()
  Serial.print("get units: \t\t");
  Serial.println(scale.get_units(5), 1);         // print the average of 5 readings from the ADC minus tare weight, divided

  // by the SCALE parameter set with set_scale
  Serial.println("Readings:");
}

void loop() {
  
if (millis() >= prevTime+1000){ //read scale every 1 second

 float sensorReading = (scale.get_units());
 Serial.print(sensorReading);
 Serial.print("\t\t");
  prevTime=millis();
 motorSpeed = sensorReading*40; //update motorSpeed
  //motorSpeed=200;
  Serial.println(motorSpeed);
  
}
   
  // set the motor speed:
 
     myStepper.setAcceleration(35);
     myStepper.setMaxSpeed(1000);
     myStepper.setSpeed(motorSpeed);      
     myStepper.runSpeed();
  
  //scale.power_down();// put the ADC in sleep mode
  //delay(5000);
  //scale.power_up();
  
}