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Interfacing of Arduino with Slider Switch :

interfacing

ARDUINO CODE

int ledRed = 13;
int ledGreen = 12;
int switchPin = 7;

void setup()
{
  pinMode(ledRed, OUTPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(switchPin, INPUT);
}

void loop()
{
  int SwitchV = digitalRead(switchPin); // Read the status of Slider Switch.
  if( SwitchV == HIGH) // Check whether the switch is HIGH or not.
   {
    digitalWrite(ledRed,1); //Turn on Red LED.
    digitalWrite(ledGreen,0); // Turn off Green LED.
  }
   else
   {
    digitalWrite(ledRed,0); // Turn on Green LED.
    digitalWrite(ledGreen,1); // Turn off Red LED.
   }
}

Start Simulation