// Define the pin for the LDR sensor
const int ldrPin = A0;

// Threshold value for distinguishing between light and dark
const int threshold = 490;

// Variable to store received binary data
String receivedData = "";

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
}

void loop() {
  // Read the value from the LDR sensor
  int ldrValue = analogRead(ldrPin);
  
  // Check if the received light intensity is above the threshold
  if (ldrValue > threshold) {
    // Light detected, consider it as a binary '1'
    receivedData += "1";
  } else {
    // No light detected, consider it as a binary '0'
    receivedData += "0";
  }
  
  // Check if a complete byte has been received (assuming 8-bit data)
  if (receivedData.length() >= 8) {
    // Convert the received binary data to a character and print it
    char receivedChar = strtol(receivedData.c_str(), NULL, 2);
    Serial.print(receivedChar);
    
    // Clear the received data buffer for the next byte
    receivedData = "";
  }
}