#include <Wire.h>
//Xiao adress will be 0x8B
//Attiny adress will be 0x4A

#define button D1
#define led D7
const int info = 5;
int ledtimes = 0;
int val = 0;
bool butstate = 0;

void setup() {
  Wire.begin();       
  Serial.begin(9600);
  pinMode(button,INPUT);
  pinMode(led,OUTPUT);
  Serial.println("I2C communication");
}
   
void loop() {
  Serial.println("------------------------");
  Serial.println("Press a button to start");
  while (!butstate){
    butstate = digitalRead(button);
    digitalWrite(led,HIGH);
    delay(100);
    butstate = digitalRead(button);
    digitalWrite(led,LOW);
    delay(100);
    ledtimes ++;
  }
  butstate = 0;
  Serial.println("Potenciometer");
  Wire.requestFrom(0x4A, info); //Attiny, amount of information
  for(int i=0;i<4;i++){
      char d1 = Wire.read();
      Serial.print(d1);
  }  
  int c = Wire.read(); // receive a byte as number
  val = c;
  Serial.println(c);
  Serial.print("Led blinked: ");
  Serial.println(ledtimes);
  delay(500);
  encrypt(val);
}

void encrypt(int x){ 
  char data = 'X';
  if (x < 40) {
  data = 'B';
  } else if (x < 80){
  data = 'C';
  } else if (x < 120){
  data = 'D';
  } else if (x < 160){
  data = 'E';
  } else if (x < 200){
  data = 'F';
  } else{
  data = 'A';
  }
  Wire.beginTransmission(0x8B);
  Wire.write(data);             // Send the byte 
  byte error = Wire.endTransmission(); 

  if (error == 0) {
    Serial.println("Transmission successful");
  } else {
    Serial.print("Error: ");
    Serial.println(error);
  }
}