#include <Arduino.h>
#include "HX711.h"

// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 12;
const int LOADCELL_SCK_PIN = 13;

// const int trigPin = 5;
// const int echoPin = 18;

//define sound velocity in cm/uS
#define SOUND_VELOCITY 0.034
#define CM_TO_INCH 0.393701

// long duration;
// float distanceCm;
// float distanceInch;

HX711 scale;

void loadcellSetup(){

  Serial.println("HX711 Demo");

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_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(416.0);
  //scale.set_scale(-471.497);                      
  // 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 setup() {
  Serial.begin(115200);
  
  loadcellSetup();

  // pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  // pinMode(echoPin, INPUT); // Sets the echoPin as an Input
}

void loop() {
  Serial.print("one reading:\t");
  Serial.print(scale.get_units(), 1);
  Serial.print("\t| average:\t");
  Serial.println(scale.get_units(10), 5);

  scale.power_down();             // put the ADC in sleep mode
  delay(1000);
  scale.power_up();


// // Clears the trigPin
//   digitalWrite(trigPin, LOW);
//   delayMicroseconds(2);
//   // Sets the trigPin on HIGH state for 10 micro seconds
//   digitalWrite(trigPin, HIGH);
//   delayMicroseconds(10);
//   digitalWrite(trigPin, LOW);
  
//   // Reads the echoPin, returns the sound wave travel time in microseconds
//   duration = pulseIn(echoPin, HIGH);
  
//   // Calculate the distance
//   distanceCm = duration * SOUND_VELOCITY/2;
  
//   // Convert to inches
//   distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance on the Serial Monitor
  // Serial.print("Distance (cm): ");
  // Serial.println(distanceCm);
  // Serial.print("Distance (inch): ");
  // Serial.println(distanceInch);
  
  delay(1000);


}