#include <Arduino.h>
			#include <Wire.h>
			
			constexpr uint8_t ledPin = D2; // Pin for the LED
			constexpr uint8_t i2cAddress = 0x04; // I2C address of this device
			volatile int receivedByte = 0; // Stores the received byte
			
			void setup() {
			  pinMode(ledPin, OUTPUT);  // Configure the LED pin as output
			  Wire.begin(i2cAddress);   // Set this device's I2C address
			  Wire.onReceive(onI2CReceive); // Set the I2C receive function
			  Serial.begin(115200);     // Start serial communication at 115200 bps
			}
			
			void loop() {
			  delay(200);  // Passive wait for I2C commands
			}
			
			void onI2CReceive(int byteCount) {
			  while (Wire.available() > 0) {
				receivedByte = Wire.read();  // Read the received byte
				if (receivedByte == 1) {
				  digitalWrite(ledPin, HIGH);   // Turn on the LED
				  delay(1000);                  // Keep the LED on for 1 second
				  digitalWrite(ledPin, LOW);    // Turn off the LED
				}
			  }
			}