#include <Wire.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(1, 0);

const int ledPin = 7;
const int buttonPin = 10;
const int potPin = A1;

bool state;
bool previousState;

void setup() {

CLKPR = (1 << CLKPCE);
CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);  

Wire.begin(8);               
Wire.onReceive(receiveEvent);
mySerial.begin(9600);

pinMode (ledPin, OUTPUT);
pinMode (buttonPin, INPUT);
state = false;
previousState = state; 

}

void loop() {
 delay(100);
}

void receiveEvent(int ledState){
  while (Wire.available()) {
    char c = Wire.read();
    mySerial.print(c);
    state = !state;
    previousState = true;
   if (state)
   digitalWrite(ledPin, state);
  }
  mySerial.println();
  previousState = false;
  digitalWrite(ledPin, state);
}