Heavy Current Hacking: The Upcycled Dishwasher

A broken motherboard on a $600 dishwasher turns it into a giant piece of scrap metal. The Upcycled Dishwasher project violently bypasses the proprietary manufacturer lockouts! By completely ripping out the dead PCB and manually wiring the 240V Heater Coil, the massive AC Water Pump, and the Solenoid Drain valves directly into custom Arduino 10-Amp relays, you resurrect the steel beast with an infinite, custom-coded State Machine brain.

Interfacing the 240V Relays

Washing machines run on immensely terrifying current.

1. The State Machine logic defines the exact stages of cleaning.
2. Stage 1: Fill. The Uno commands Relay 1 (Water Inlet Valve) HIGH. It counts the pulses from a flow meter, dropping the relay when 3 gallons enter the tub.
3. Stage 2: Heat. The Uno triggers Relay 2 (Heater Coil). WARNING: A heater coil pulls thousands of Watts. You MUST use a highly specialized, snubber-protected 30-Amp Contactor Relay, not a cheap blue plastic Arduino relay, or it will instantly catch fire!
4. Stage 3: Wash. The Uno triggers Relay 3 (Main AC Water Pump).
5. An exact timing loop (millis()) runs for 20 minutes, vigorously blasting the dishes with hot water before commanding a drain purge!

The EEPROM Failure Lock

Dishwashers take 2 hours to run. If your house loses power at minute 55, a dumb Arduino starts over from minute zero upon reboot and floods the kitchen.

• The Execution: You must implement persistent data storage using <EEPROM.h>.
• Every 5 minutes, the Arduino violently writes its current "Stage" into the hard ROM. EEPROM.write(0, currentStage);
• When the massive machine boots up from a blackout, it reads Stage=3 from ROM and beautifully resumes the wash cycle exactly where it died!

Appliance Execution Array

• Arduino Mega 2560 (Mandatory. An Uno will crash when a massive 240V AC pump turns on due to EMI spikes; the Mega has better 5V ground-plane routing!).
• Heavy Duty 30-Amp Solid State Relays (SSR) or Magnetic Contactors (Crucial for safely managing extreme inductive AC power loads).
• Water Flow Sensors and DS18B20 Steel Temp Sensors placed inside the wash tub.
• (DANGER: Working with 110V/240V Mains Electricity mixed with pooling water requires extreme physical insulation, fuses, and absolute knowledge of GFCI circuit breakers!)