#include <Wire.h>
              void setup() 
	{
                Serial.begin(115200);//begin serial monitor at 155'20 baud
                Wire.begin(); // join i2c bus (address optional for master)
                pinMode(2,OUTPUT);//sets the Built in led as an output
        }//close void setup
              void loop() 
	{
                while (Serial.available()) 
	{ //while the serial monitor is "avaliable" open
                  char c = Serial.read();//read the value typed on the serial monitor and store it on a character variable called "c" 
                  if(c=='H')
		{//if the variable "c" is equal to the character "H"
                    Wire.beginTransmission(4);//then open comunication to the node on adress "4"
                    Wire.write('H');// write the value "H" to the message to send
                    Wire.endTransmission();//finish transmition of the message
                    Serial.println("writing to address 4!");//print on the serial monitor were have the message sent to
                 }//close first if
                  else if(c=='L')
		  {//otherwise check if the value is the charater "L"
                    Wire.beginTransmission(4);//again begin transmision of a message to addres "4"
                    Wire.write('L');//write the character "L"
                    Wire.endTransmission();//finish transmision of the message
                    Serial.println("writing to address 4!");//write on the serial monitor were just sent the message
        	 }//close second if
		}//close while
	}//close void loop