#define D0_PIN 16
#define D1_PIN 17
#define D2_PIN 18
#define D3_PIN 19
#define VT_PIN 21  // Optional, for valid transmission detection

void setup() {
  Serial.begin(115200);    // Initialize serial communication
  
  // Set D0-D3 pins and VT_PIN as inputs
  pinMode(D0_PIN, INPUT);
  pinMode(D1_PIN, INPUT);
  pinMode(D2_PIN, INPUT);
  pinMode(D3_PIN, INPUT);
  pinMode(VT_PIN, INPUT);
}

void loop() {
  if (digitalRead(VT_PIN) == HIGH) { // Check if the VT pin is HIGH (valid transmission detected)
    // Read from each data pin
    int d0_value = digitalRead(D0_PIN);
    int d1_value = digitalRead(D1_PIN);
    int d2_value = digitalRead(D2_PIN);
    int d3_value = digitalRead(D3_PIN);

    // Print the values of each data pin
    Serial.print("D0: ");
    Serial.print(d0_value);
    Serial.print(" D1: ");
    Serial.print(d1_value);
    Serial.print(" D2: ");
    Serial.print(d2_value);
    Serial.print(" D3: ");
    Serial.println(d3_value);
  }
}