const int momentarySwitchPin  = 6; // Arduino pin connected to button's pin

const int latchingSwitchInputPin = 6;
const int latchingSwitchOutputPin = 3; // Arduino pin connected to relay's pin

// Variables to store switch states
int switchState = LOW;
int lastSwitchState = LOW;
int latchingSwitchState = LOW;

void setup() {
                 // initialize serial
  pinMode(momentarySwitchPin, INPUT); // Set the momentary switch pin as INPUT
  // Set the latching switch input and output pins as INPUT and OUTPUT, respectively
  pinMode(latchingSwitchInputPin, INPUT);
  pinMode(latchingSwitchOutputPin, OUTPUT);

   Serial.begin(9600);
}

void loop()
 {
   // Read the state of the momentary switch
  switchState = digitalRead(momentarySwitchPin);

  // Check for a rising edge (transition from LOW to HIGH) on the momentary switch
  if (switchState == HIGH && lastSwitchState == LOW) {
    // Toggle the state of the latching switch
    latchingSwitchState = !latchingSwitchState;
    delay(1000);
    digitalWrite(latchingSwitchOutputPin, latchingSwitchState);
    Serial.println("Toggle Latching Switch");   
}
     // Update the last switch state
   lastSwitchState = switchState;
 }