// Frequenzmessung an GP4 (Pico, Arduino Core)
// Zählt steigende Flanken im Interrupt und berechnet die Frequenz.

const byte VALVE1 = 6;
const byte VALVE2 = 7;
const byte VALVE3 = 8;
const byte VALVE4 = 9;
const byte VALVERUECK = 26;
int valves = 2;
int state = 1;
unsigned long now = 0;
unsigned long lasttime = 0;


void setup() {
  Serial.begin(115200);



  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(26,OUTPUT);
  digitalWrite(VALVE1,HIGH);
  digitalWrite(VALVE2,HIGH);
  digitalWrite(VALVE3,HIGH);
  digitalWrite(VALVE4,HIGH);
  digitalWrite(VALVERUECK,HIGH);
}

void Cycle(){
  digitalWrite(VALVERUECK,HIGH);
  now = millis();
  switch (state)
  {
    case 1:
      digitalWrite(VALVE1,LOW);
      if (now-lasttime >= 1000)
      {
        lasttime = now;
        digitalWrite(VALVE1,HIGH);
        if (valves-state > 0)
        {
          state = 2; 
        }
      else{state = 1;}
      }
    break;
    case 2:
      digitalWrite(VALVE2,LOW);
      if (now-lasttime >= 1000)
      {
        lasttime = now;
        digitalWrite(VALVE2,HIGH);
        if (valves-state > 0)
        {
          state = 3; 
        }
       else{state = 1;}
      }
    break;
    case 3:
      digitalWrite(VALVE3,LOW);
      if (now-lasttime >= 1000)
      {
        lasttime = now;
        digitalWrite(VALVE3,HIGH);
        if (valves-state > 0)
        {
          state = 4; 
        }
      else{state = 1;}
      }
    break;
    case 4:
      digitalWrite(VALVE4,LOW);
      if (now-lasttime >= 1000)
      {
        lasttime = now;
        digitalWrite(VALVE4,HIGH);
      state = 1;
      }
    break;
    default:
    break;
  }
}

void loop() {
  if()
      Cycle();


}