#define RGB_r  D9
  #define RGB_g  D10
  #define RGB_b  D11
  #define S2  D3
  #define S1  D2

unsigned int RGB_Wert;
bool S2_state, S1_state;

void setup()
{
  pinMode(RGB_r, OUTPUT);
  pinMode(RGB_g, OUTPUT);
  pinMode(RGB_b, OUTPUT);
  pinMode (S2_state, INPUT);
  pinMode (S1_state, INPUT);
  Serial.begin(115200);    
 // I2C_LCD_init();
  analogWriteResolution (16); //0-65535 PWM duty cycle
  analogWriteFrequency(2000); // Set PMW period to 2000 Hz instead of 1000
}

void loop()
{
 RGB_Wert = 50000;
 S2_state = 1; //digitalRead(S2);
S1_state =  1; //digitalRead(S1);
 
 if ((S2_state == HIGH) & (S1_state == HIGH))
  {
  analogWrite(RGB_r, RGB_Wert); 
  analogWrite(RGB_g, RGB_Wert); 
  analogWrite(RGB_b, RGB_Wert); 
 // I2C_LCD("" + String(RGB_Wert) + "" +String(RGB_Wert) + "" +String(RGB_Wert));
  }
 if ((S2_state == LOW) & (S1_state == LOW))
  {
  analogWrite(RGB_g, 0); 
  analogWrite(RGB_r, RGB_Wert); 
  analogWrite(RGB_b, 0); 
//  I2C_LCD("    " + String(RGB_Wert) + "   " +String(0) + "  " +String(0));
  }
 
 if ((S2_state == LOW) & (S1_state == HIGH))
  {
  analogWrite(RGB_r, 0); 
  analogWrite(RGB_g, RGB_Wert); 
  analogWrite(RGB_b, 0); 
 // I2C_LCD("    " + String(0) + "   " +String(RGB_Wert) + "  " +String(0));
  }
 if ((S2_state == HIGH) & (S1_state == LOW))
  {
  analogWrite(RGB_r, 0); 
  analogWrite(RGB_g, 0); 
  analogWrite(RGB_b, RGB_Wert); 
 // I2C_LCD("    " + String(0) + "   " +String(0) + "  " +String(RGB_Wert));
  }
 
 delay(1000);
}