Air Cooler Control Conversion from Mechanical Switch To Digital using Arduino

Air Cooler Control Conversion from Mechanical Switch To Digital using Arduino

Arduino Digital Input Tutorial

Original Wiring Diagram

Original Wiring Diagram

with Float Switch

New Wiring Diagram

via Arduino

Arduino Diagram

Parts List

• Power Supply 5v
• Arduino Nano
• ULN2803
• Push Button
• Resistor
• Float Switch
• Relay
• 5mm RGB led

Arduino For Loop Tutorial

Arduino Code

/* This Code is Written by Pinoy Elektrisyan
   visit my Facebook Page   https://goo.gl/Y8YS68
   visit my youtube Channel https://bit.ly/2Lg8TDJ
   Date April 24, 2020
   Application: Speed Controller for single phase 3 speed motor via potentiometer
   with push button for water pump and swing (Air Cooler)
   the debouncing I used in this code is based on tutorial of a fellow youtuber "learnelectronics" 
   watch here https://www.youtube.com/watch?v=ojflP6pvTMc&t=58s
   Wiring Diagram https://bit.ly/2AafoFK
*/
//======GLOBAL VARIABLES==========
//----INPUTS---------------------------------------------------------
int pbSwing = 10;      // momentary push button for swing (pulldown via 20kΩ resistor)
int pbPump = 11;       // momentary push button for swing (pulldown via 20kΩ resistor)
int floatSwitch = 12;  // Float Switch (pulldown via 20kΩ resistor)
int pbSpeed = A0;      // momentary push button for speed control
//---OUTPUTS---------------------------------------------------------
int speed1 = 2;        // relay for blower speed (Low)
int speed2 = 3;        // relay for blower speed (Med)
int speed3 = 4;        // relay for blower speed (HIGH)
int swing = 5;        // relay for Swing motor
int pump = 6;        // relay for Pump Motor
int ledSpeed1 = 7;     // Led for blower speed (Low)
int ledSpeed2 = 8;     // Led for blower speed (Med)
int ledSpeed3 = 9;     // Led for blower speed (High)
int ledSwing = 13;     // Led for Speed
int ledPumpGreen = A1; // Led for Pump Running
int ledPumpRed = A2;   // Led for Pump Error (Low Water Level)
//--------------------------------------------------------------------
int speedPosition = 0;// Speed monitoring for swing and pump interlock
int lastPosition = 0;
int swingPress = 0;
int pumpPress = 0;
bool floatPosition = 0;
int blower = 0;
void setup() {
  /*Declare Output Pins*/
  pinMode (speed1, OUTPUT);
  pinMode (speed2, OUTPUT);
  pinMode (speed3, OUTPUT);
  pinMode (swing, OUTPUT);
  pinMode (pump, OUTPUT);
  pinMode (ledSpeed1, OUTPUT);
  pinMode (ledSpeed2, OUTPUT);
  pinMode (ledSpeed3, OUTPUT);
  pinMode (ledSwing, OUTPUT);
  pinMode (ledPumpGreen, OUTPUT);
  pinMode (ledPumpRed, OUTPUT);
  /*Turn off all Relays*/
  digitalWrite (speed1, LOW);
  digitalWrite (speed2, LOW);
  digitalWrite (speed3, LOW);
  digitalWrite (swing, LOW);
  digitalWrite (pump, LOW);
  /*Animate led at start up*/
  for (int i = 0; i <= 6; i = i + 1) {
    delay (200);
    digitalWrite (ledSwing, HIGH);
    delay (50);
    digitalWrite (ledSpeed1, HIGH);
    delay (50);
    digitalWrite (ledSpeed2, HIGH);
    delay (50);
    digitalWrite (ledSpeed3, HIGH);
    delay (50);
    digitalWrite (ledPumpGreen, HIGH);
    delay (50);
    digitalWrite (ledSwing, LOW);
    digitalWrite (ledSpeed1, LOW);
    digitalWrite (ledSpeed2, LOW);
    digitalWrite (ledSpeed3, LOW);
    digitalWrite (ledPumpGreen, LOW);
  }
}
void loop() {
  swingPress = digitalRead (pbSwing); // read push button for swing
  pumpPress = digitalRead (pbPump);   // read push button for pump
  floatPosition = digitalRead (floatSwitch);
  blower = digitalRead(pbSpeed);
  if (floatPosition == 0) {
    digitalWrite(pump, LOW);
    digitalWrite(ledPumpGreen, LOW);
    digitalWrite(ledPumpRed, HIGH);
  }
  else {
    digitalWrite (ledPumpRed, LOW);
  }
  if (blower == 1) {
    delay(50);
    blower = digitalRead (pbSpeed);
    if (blower == 0) {
      speedPosition = lastPosition + 1;
    }
  }
  else if ( pumpPress == 1) {
    delay(50);
    pumpPress = digitalRead(pbPump);
    if ((pumpPress == 0) && (lastPosition != 0)) {
      digitalWrite (pump, !digitalRead(pump));
      if (digitalRead(pump) == 1) {
        digitalWrite(ledPumpGreen, HIGH);
      }
      else digitalWrite(ledPumpGreen, LOW);
    }
  }
  else if ( swingPress == 1) {
    delay(50);
    swingPress = digitalRead (pbSwing);
    if (( swingPress == 0) && (lastPosition != 0)) {
      digitalWrite (swing, !digitalRead(swing));
      if (digitalRead(swing) == 1) {
        digitalWrite (ledSwing, HIGH);
      }
      else digitalWrite(ledSwing, LOW);
    }
  }
  else {
    delay (100);
  }
  switch (speedPosition) {
    case 1:
      digitalWrite (ledSpeed1, HIGH);
      digitalWrite (ledSpeed2, LOW);
      digitalWrite (ledSpeed3, LOW);
      digitalWrite (speed1, HIGH);
      digitalWrite (speed2, LOW);
      digitalWrite (speed3, LOW);
      lastPosition = speedPosition;
      break;
    case 2:
      digitalWrite (ledSpeed1, HIGH);
      digitalWrite (ledSpeed2, HIGH);
      digitalWrite (ledSpeed3, LOW);
      digitalWrite (speed1, LOW);
      digitalWrite (speed2, HIGH);
      digitalWrite (speed3, LOW);
      lastPosition = speedPosition;
      break;
    case 3:
      digitalWrite (ledSpeed1, HIGH);
      digitalWrite (ledSpeed2, HIGH);
      digitalWrite (ledSpeed3, HIGH);
      digitalWrite (speed1, LOW);
      digitalWrite (speed2, LOW);
      digitalWrite (speed3, HIGH);
      lastPosition = speedPosition;
      break;
    default:
      digitalWrite (ledSpeed1, LOW);
      digitalWrite (ledSpeed2, LOW);
      digitalWrite (ledSpeed3, LOW);
      digitalWrite (ledSwing, LOW);
      digitalWrite (ledPumpGreen, LOW);
      digitalWrite (speed1, LOW);
      digitalWrite (speed2, LOW);
      digitalWrite (speed3, LOW);
      digitalWrite (swing, LOW);
      digitalWrite (pump, LOW);
      lastPosition = 0;
      break;
  }
}



Download Code Here