/*
  https://forum.arduino.cc/t/arduino-uno-programming/1260837

*/


int IN1pin = 9;
int IN2pin = 8;
int ENApin = 6;

int Bubble_fc_sensorpin1 = 12;
int Bubble_fc_sensorpin2 = 13;

unsigned long lastMove;
unsigned long intervalMove = 500;

byte stateMove = 0;

void setup() {
  pinMode(IN1pin, OUTPUT);
  pinMode(IN2pin, OUTPUT);
  pinMode(ENApin, OUTPUT);

  pinMode(Bubble_fc_sensorpin1, INPUT);
  pinMode(Bubble_fc_sensorpin2, INPUT);
  Serial.begin(9600);
}

void loop() {

  unsigned long now  = millis();

  if (digitalRead(Bubble_fc_sensorpin1) == HIGH && digitalRead(Bubble_fc_sensorpin2) == HIGH) {
    if (now - lastMove >= intervalMove) {
      lastMove = now;
      switch (stateMove) {

        case 0: digitalWrite(IN1pin, HIGH);
          digitalWrite(IN2pin, LOW);
          analogWrite(ENApin, 255);
          intervalMove = 500;
          stateMove = 1;
          break;
        case 1: digitalWrite(IN1pin, LOW);
          digitalWrite(IN2pin, LOW);
          analogWrite(ENApin, 0);
          intervalMove = 1000;
          stateMove = 0;
          break;
      }
    }
  } else { //one of the sensors are triggered..
    //enter a stopped state..
    digitalWrite(IN1pin, LOW);
    digitalWrite(IN2pin, LOW);
    analogWrite(ENApin, 0);
    intervalMove = 1000;
    stateMove = 0;
  }
}