FruitBowl.ino

// Include Libraries
#include "Arduino.h"
#include "HX711.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

// Pin Definitions
#define DFPLAYER_PIN_RX  11
#define DFPLAYER_PIN_TX 10
#define LOADCELLHX711SF_PIN_DAT 3
#define LOADCELLHX711SF_PIN_CLK 2

// Global variables and defines
float bowlWeightFull = 0;
float tempWeight = 0;

// Constructors
HX711 scale;
SoftwareSerial dfPlayerSerial(DFPLAYER_PIN_TX, DFPLAYER_PIN_RX);
DFRobotDFPlayerMini myDFPlayer;

/* This code sets up the essentials for your circuit to work. It runs first every time your circuit is powered with electricity. */
void setup() {
  // Setup Serial which is useful for debugging
  // Use the Serial Monitor to view printed messages
  Serial.begin(9600);
  while (!Serial) ; // wait for serial port to connect. Needed for native USB
  Serial.println("start");

  dfPlayerSerial.begin(9600);
  if (!myDFPlayer.begin(dfPlayerSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while (true);
  }
  Serial.println(F("DFPlayer Mini online."));
  myDFPlayer.volume(30);
  
  scale.begin(LOADCELLHX711SF_PIN_DAT, LOADCELLHX711SF_PIN_CLK);
  scale.set_scale(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
  
  //get empty bowl weight
  bowlWeightFull = scale.get_units(10);
}

/* This code is the main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop. */
void loop() {
    tempWeight = scale.get_units(5);
    //when filling the bowl, update its weight
    if (tempWeight - bowlWeightFull > 100){
      bowlWeightFull = tempWeight;
      Serial.println("Fruit added");
    }
    // A fruit was taken from the bowl, play something
    else if (bowlWeightFull - tempWeight > 100)
    {
      myDFPlayer.next();
      Serial.println("Fruit Taken");
      bowlWeightFull = tempWeight;
      delay(3000);
      
    }
  }



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