Automatic Liquid Dispenser

Contactless, automatic liquid dispenser system that promotes hygiene and convenience across home, medical, and public settings.

Housing: 15.24 x 18.54 x 33.02 cm ABS/Acrylic

Voltage: 12 V

Power: 0.7925 W (Idle), 4.39 W (Pump On)

Liquid Capacity: 1.25 L

Dispense Volume: 25 mL

Components:

IR Distance Sensor | Arduino | Uxcell Micro Pump | LCD 16x2 | 0.96in OLED | MOSFET | Buck Converter

Electronics/Software:

The infrared sensor reads a value and converts it into a voltage amount. If the voltage exceeds the set threshold, the Arduino activates the pump system. While the pump takes 12 V, the rest of the components use 5 V, using the buck converter for their power input.

  
    void loop() {
  float sensorValue = analogRead(IRpin);
  float IRvoltage = (sensorValue * 5.0) / adcMAX;

  if (cd <= 0) {
    if (IRvoltage > MinVoltage) {
      newState = "DISPENSING";
      digitalWrite(PumpPin, HIGH);
      delay(dispenseTime);
      digitalWrite(PumpPin, LOW);
      cd = cooldown * 1000 / cycleTime;
      dispenseCount++;
    } else {
      newState = "READY";
      digitalWrite(PumpPin, LOW);
    }
  } else {
    newState = "COOLDOWN";
    cd--;
  }

  if (newState != lastState) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(newState);
    lastState = newState;
    delay(500);
  }
  if (newState == "COOLDOWN") {
      lcd.setCursor(0, 1);
      int displayCD = cd * cycleTime / 1000.0;
      lcd.print(displayCD);
      lcd.print(" s");
  }
  delay(cycleTime);
}

  
  