/*
  Forum: https://forum.arduino.cc/t/dc-motor-mit-l293d-zufallig-ansteuern/1210964/6
  Wokwi: https://wokwi.com/projects/386922640522676225
*/
const byte motorA = 12;
const byte motorB =  8;

unsigned long zuletzt = 0;

byte stateA = 0;

void setup() {
  Serial.begin(115200);
  pinMode(motorA, OUTPUT);
  pinMode(motorB, OUTPUT);
  controlMotor(stateA,stateA);
  randomSeed(millis());
}

void loop() {
  if (millis()-zuletzt >= 2000){
     zuletzt = millis();
     stateA = random(2);
     Serial.println(stateA);
     controlMotor(stateA,!stateA);
  }
}

void controlMotor(byte A, byte B){
  digitalWrite(motorA, A);
  digitalWrite(motorB, B);
}