TTP223 Touch Sensor Module Capacitive

				
					// Pin definitions
const int touchPin = 2;     // TTP223 touch sensor digital pin
const int whiteLedPin = 3;  // White LED PWM pin
const int yellowLedPin1 = 4;// First yellow LED pin
const int yellowLedPin2 = 5;// Second yellow LED pin

// State variables
int currentTouchState = 0;  // Current touch sensor state
int previousTouchState = 0; // Previous touch sensor state
int touchCycleCount = 0;    // Touch cycle counter (0-3)

void setup() {
  // Initialize pins
  pinMode(touchPin, INPUT);
  pinMode(whiteLedPin, OUTPUT);
  pinMode(yellowLedPin1, OUTPUT);
  pinMode(yellowLedPin2, OUTPUT);
  
  // Initial state: all LEDs off
  digitalWrite(whiteLedPin, LOW);
  digitalWrite(yellowLedPin1, LOW);
  digitalWrite(yellowLedPin2, LOW);
  
  // Serial monitor for debugging (optional)
  // Serial.begin(9600);
}

void loop() {
  // Read touch sensor state
  currentTouchState = digitalRead(touchPin);
  
  // Detect touch press (low to high transition)
  if (currentTouchState == HIGH && previousTouchState == LOW) {
    // Increment cycle counter and loop between 0-3
    touchCycleCount = (touchCycleCount + 1) % 4;
    
    // Set LED states based on cycle count
    switch(touchCycleCount) {
      case 0: // All LEDs off
        digitalWrite(whiteLedPin, LOW);
        digitalWrite(yellowLedPin1, LOW);
        digitalWrite(yellowLedPin2, LOW);
        // Serial.println("State 0: All LEDs off");
        break;
      case 1: // White LED 20%, both yellow LEDs off
        analogWrite(whiteLedPin, 51);  // PWM 51 ≈ 20% brightness
        digitalWrite(yellowLedPin1, LOW);
        digitalWrite(yellowLedPin2, LOW);
        // Serial.println("State 1: White 20%, Yellows off");
        break;
      case 2: // Both yellow LEDs on, white LED off
        digitalWrite(whiteLedPin, LOW);
        digitalWrite(yellowLedPin1, HIGH);
        digitalWrite(yellowLedPin2, HIGH);
        // Serial.println("State 2: Both yellows on");
        break;
      case 3: // White LED 20%, both yellow LEDs on
        analogWrite(whiteLedPin, 51);  // PWM 51 ≈ 20% brightness
        digitalWrite(yellowLedPin1, HIGH);
        digitalWrite(yellowLedPin2, HIGH);
        // Serial.println("State 3: White 20%, both yellows on");
        break;
    }
    
    // Add short delay to prevent multiple detections
    delay(200);
  }
  
  // Update previous touch state
  previousTouchState = currentTouchState;
}