/*
PHOTO analog - tip 18.02.2020
 */
const int photo = A0;

int out6 = 6 ;
int out9 = 9 ;
int out4 = 4 ;
int br = 0;
// defines variables

void setup() {
  Serial.begin(9600); 
  pinMode(photo, INPUT); 
  pinMode(out6, OUTPUT); 
  pinMode(out9, OUTPUT); 
  pinMode(out4, OUTPUT);       
  }
void loop() {
  br = analogRead(photo);
  Serial.println(br);  
  if ( br > 600 && br < 800)
  { 
    digitalWrite(out6, 1); 
    digitalWrite(out9, 0); 
    digitalWrite(out4, 0);     
  }
    if ( br > 300 && br < 600)
  { 
    digitalWrite(out9, 1); 
    digitalWrite(out6, 0); 
    digitalWrite(out4, 0);    
  }
    if ( br < 100)
  { 
    digitalWrite(out4, 1);
    digitalWrite(out9, 0); 
    digitalWrite(out6, 0);
  }
}