Arduino project gold melting machine.

Arduino gold melting machine

Building a DIY gold melting machine (often called an Induction Heater) with an Arduino is a high-level project that blends power electronics with precise coding. Since gold melts at approximately 1,064°C, you aren't just building a gadget; you're building a piece of industrial equipment.

1. The Core Technology: Induction Heating

Here is the blueprint for a professional-grade induction melter....

Instead of using a flame, induction heating uses an electromagnetic field to create "eddy currents" inside the metal itself, heating it from the inside out.

  • The Goal: Use an Arduino to manage the Pulse Width Modulation (PWM) and monitor safety sensors.
  • The Crucible: You must use a graphite crucible, as it is conductive and can withstand the extreme heat required for gold.

    • 2. Essential Hardware Components

  • Component : Purpose
  • Arduino Nano/Uno : The "brain" that regulates frequency and safety.
  • ZVS Driver Circuit : The Zero Voltage Switching circuit that handles high current.
  • Work Coil : 1/4" Copper tubing (needs water cooling via a small pump).
  • High-Voltage MOSFETs : Usually IRFP260N or similar, to handle the power load.
  • Power Supply : 48V / 20A–30A DC (Mean Well or similar industrial PSU).
  • K-Type Thermocouple : With a MAX6675/MAX31855 module for temperature readings.

    • 3. High-Level Logic & Code

    The Arduino's primary job is to ensure the MOSFETs don't overheat and the metal reaches the target temperature without overshooting.

  • Frequency Control: Arduino can fine-tune the frequency to match the "sweet spot" of your LC circuit (Inductor-Capacitor).
  • Safety Interlocks: If the water cooling pump fails or the MOSFET temperature exceeds 70°C, the Arduino should instantly kill the power via a relay.

    • A Word of Caution: Dealing with 20A–50A of current and 1,000°C+ temperatures is inherently dangerous. High-frequency electromagnetic fields can also interfere with nearby electronics. Always wear IR-rated safety goggles and use heat-resistant gloves.