uint32_t time_since, time_since_2;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(millis() - time_since > 1000) {
    if(digitalRead(7)) digitalWrite(7, LOW);
    else digitalWrite(7, HIGH);
    time_since = millis();
  }
  if(millis() - time_since_2 > 500) {
    if(digitalRead(8)) digitalWrite(8, LOW);
    else digitalWrite(8, HIGH);
    time_since_2 = millis();
  }
}