int actualValue;
int lastValue;
unsigned long time1;
int go = 1;

void setup() {

  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);

  Serial.begin(9600);
  Serial.println("BEGIN");
  Serial.println(); 
}

void loop() {

actualValue = analogRead(A0);

// left RED
if (go == 1) {
if (lastValue - actualValue > 5) {
Serial.println(actualValue); 
lastValue = actualValue;
digitalWrite(7, HIGH);
time1 = millis() + 200;
go = 0;
}
}

if (go == 1) {
// right GREEN
if (actualValue - lastValue > 5) {
Serial.println(actualValue); 
lastValue = actualValue;
digitalWrite(6, HIGH);
time1 = millis() + 200;
go = 0;
}
}

  if (millis() > time1) {
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    go = 1;
  }



}