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RVM

An Arduino Project that utilizes the use of Ethernet Shield, Load Cell, NFC Module, Servos, LCD and mySQL database to rewards user with digital points that can be used as a currency.

Material

  • Arduino UNO
  • Ethernet Shield
  • Liquid Crystal LCD
  • PN532 NFC Module
  • Load Cell & HX711 Amplifier
  • Breadboard
  • Machine Main Structure/Body

Libraries

How it works

RVM works by weighing the object put by user and calculate amount of points will be rewarded using that data. After getting the amount of point that will be rewarded RVM will wait until user tap an NFC Card and write the amount of points the user have then sent the newest data to the mySQL database through HTTP Request using the Ethernet Shield.

Setup

Step 1: Install XAMPP

Install XAMPP and open XAMPP control panel to enable mySQL and web server XAMPP Control Panel v3 3 0 Compiled_ Apr 6th 2021 8_20_2025 6_53_11 PM

Step 2: Create Database

Create a database named db_arduino for storing the points data for each user then create a table called rvm_table and then create a mySQL account that can be accessed from localhost only so the table can be accessed by localhost only. image

Step 3: Place PHP File in HTDOCS Folder

Download or copy and place the injector.php file inside C:\XAMPP\htdocs\

<?php

if(isset($_GET["uid"])) {
   $uid = $_GET["uid"]; // get uid value from HTTP GET
   $nama = $_GET["nama"]; // get nama value from HTTP GET
   $points = $_GET["points"]; // get points value from HTTP GET

   $servername = "localhost";
   $username = "Arduino";
   $password = "ArduinoPass";
   $dbname = "db_arduino";

   // Create connection
   $conn = new mysqli($servername, $username, $password, $dbname);
   // Check connection
   if ($conn->connect_error) {
      die("Connection failed: " . $conn->connect_error);
   }

   $sql = "INSERT INTO db_rvm (uid_value, name, points_value) VALUES ($uid, '$name', $points)";

   if ($conn->query($sql) === TRUE) {
      echo "New record created successfully";
   } else {
      echo "Error: " . $sql . " => " . $conn->error;
   }

   $conn->close();
} else {
   echo "Data is not set";
}

?>

Step 4: Connect Pins

Connect the pins: LCD

  • GND --> GND
  • VCC --> 5V
  • SDA --> A4
  • SCL --> A5

PN532

  • GND --> GND
  • VCC --> 5V
  • SDA --> SDA
  • SCL --> SCL

HX711

  • GND --> GND
  • DT --> 2
  • SCK --> 3
  • VCC --> 5V

Servo

  • GND --> GND
  • VCC --> 5V
  • SIGNAL PIN --> 11

Servo

  • GND --> GND
  • VCC --> 5V
  • SIGNAL PIN --> 10

Tip

You can configure your own pins for DT, SCK and Servo signal pin by configuring the code

Step 5: Calibrate Load Cell

  • Open the example code from HX711_ADC library

    image

  • Change the pins to match your pins configuration

  • Upload the code to your Arduino

  • Open serial monitor and follow the given instructions

  • Save the calibration value to EEPROM

Step 6: Upload The Code

Install required libraries and copy the code to Arduino IDE and upload it to your Arduino UNO

image

Important

If fetching calibration value from EEPROM doesn't work on the main code you can set it yourself by changing line 81 & line 82 of the .INO code

float calibration value = <int>;
// EEPROM.get(calVal_eepromAdress, calibrationValue);

License

MIT License

Copyright (c) 2025 SanC

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions: