bool ertek = "True";

byte szam = 255;
unsigned int szam2_2 = 65535;
double egesz = 4000000000;

float tizedes = 123.15;

char betu = 'a';
String szo = "HELLO567";


float a = 12;
float b = 15;
float erdemeny = b/a;

void setup() {
Serial.begin(115200);
Serial.println(szo);

}

void loop() {
if (Serial.available() > 1) {
betu = Serial.read();
Serial.read();
Serial.println(betu);
}

}