// https://www.shellhacks.com/arduino-random-numbers-delay-randomseed/

void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(7));
}

void loop() {
  random1();
  //random2();
}

void random1() {
  // print a random number from 0 to 99
  Serial.println(random(100));

  // print a random number from 100 to 199
  Serial.println(random(100, 200));

  delay(1000);
}

void random2() {
  // print a message with a random delay from 0 to 1000 milliseconds
  Serial.println("Ping!");
  delay(random(500));

  // print a message with a random delay from 1000 to 60000 milliseconds
  Serial.println("Pong!");
  delay(random(500, 5000));
}