ardiuno i2c is slave

//ardiuno  i2c is slave = groen = a5 = klok
//                  geel = a4 = data

#include <Wire.h>



void espmastervraagtiets() {
  Wire.write("hello "); // respond with message of 6 bytes
  // as expected by master
}

void setup() {
  Wire.begin(8);                // join i2c bus with address 0x08
  Wire.onReceive(receiveEvent); // als master plots data stuurt naar nano slave
  Wire.onRequest(espmastervraagtiets); // register event als master plots info vraagt van nanoslave
  Serial.begin(115200);           // start serial for output

   Serial.println("nano slave 0x08");
}

void loop() {
  delay(100);
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
  while (1 < Wire.available()) { // loop through all but the last
    char c = Wire.read(); // receive byte as a character

  }
  int x = Wire.read();    // receive byte as an integer
   Serial.print ("esp-master stuurde naar nanoslave:");         // print the integer
  Serial.println(x);         // print the integer
}