// Slave Nano Code - Terug naar betrouwbare basis
const int r1 = 2; const int r2 = 3; const int r3 = 4; const int r4 = 5;
const int led7_Red = 10; 
const int led8_Grn = 9;  

void setup() {
  Serial.begin(9600);
  pinMode(r1, OUTPUT); pinMode(r2, OUTPUT); pinMode(r3, OUTPUT); pinMode(r4, OUTPUT);
  pinMode(led7_Red, OUTPUT); pinMode(led8_Grn, OUTPUT);
  
  // Relais uit (Active Low)
  digitalWrite(r1, HIGH); digitalWrite(r2, HIGH); 
  digitalWrite(r3, HIGH); digitalWrite(r4, HIGH); 
  
  // Start op Rood (Vcc geschakeld: LOW is AAN)
  digitalWrite(led7_Red, LOW);  
  digitalWrite(led8_Grn, HIGH); 
  Serial.println("Slave klaar - Basis mode actief");
}

void loop() {
  if (Serial.available() > 0) {
    String cmd = Serial.readStringUntil('\n'); cmd.trim();
    Serial.print("Ontvangen: "); Serial.println(cmd);
    
    if (cmd == "W1R") {
      digitalWrite(r1, LOW); delay(200); digitalWrite(r1, HIGH);
    } 
    else if (cmd == "W1A") {
      digitalWrite(r2, LOW); delay(200); digitalWrite(r2, HIGH);
    }
    else if (cmd == "S1R") {
      digitalWrite(r3, HIGH); digitalWrite(r4, HIGH);
      digitalWrite(led7_Red, LOW);  // Rood AAN
      digitalWrite(led8_Grn, HIGH); // Groen UIT
    }
    else if (cmd == "S1G") {
      digitalWrite(r3, LOW); digitalWrite(r4, LOW);
      digitalWrite(led7_Red, HIGH); // Rood UIT
      digitalWrite(led8_Grn, LOW);  // Groen AAN
    }
  }
}