const uint32_t debounceTimeout = 200;
const uint32_t frequency = 1250;
#define buttonOnPin 5
#define buttonOffPin 6
#define ledPin 7
uint32_t nextPulse;
uint32_t buttonDebounce;
bool inProgress;
bool pwmState;
bool ledState;
int val = 0;


void setup() {
  Serial.begin(9600);
  delay(100);
  Serial.println("start");
  pinMode(ledPin, OUTPUT);
  pinMode(buttonOffPin, INPUT);
  pinMode(buttonOffPin, INPUT);
  buttonDebounce = millis();
  inProgress = false;
  pwmState = LOW;
  ledState = false;
  }


void loop() {
  if (digitalRead(buttonOnPin) && buttonDebounce < millis()) {
    inProgress = true;
    Serial.println("on");
    nextPulse = millis() - 1;
    buttonDebounce = millis() + debounceTimeout;
    }
  if (digitalRead(buttonOffPin) && buttonDebounce < millis()) {
    inProgress = false;
    Serial.println("off");
    digitalWrite(ledPin, LOW);
    buttonDebounce = millis() + debounceTimeout;
    pwmState = LOW;
    ledState = false;
    }
  if(Serial.available()){
    readCommand();
    }

  if (inProgress) {
    if (nextPulse < millis()) {
      nextPulse = millis() + frequency;
      if (pwmState == LOW)
        pwmState = HIGH;
      else
        pwmState = LOW;
      digitalWrite(ledPin, pwmState);
      }
    }
//  delay(10);
  }

void readCommand() {
  String input = Serial.readString();
  Serial.println("\"" + input + "\"");
  if (input.substring(0, 8) == "schalter")
    if (inProgress)
      Serial.println("Schalter ist an");
    else
      Serial.println("Schalter ist aus");
//  int brightness = input.toInt();
//  cmd = Serial.read();
//  value = Serial.parseInt();
  }