modified by Tejswini Chaudhari
 10 july 2020


int x; // input of LDR
int y; // o/p Pwm value to be given to the base of the transistor to get reduced o/p voltage

void setup() {
  
  pinMode(A0,INPUT);
  pinMode(6,OUTPUT);
 
  Serial.begin(9600);
 
  
}

void loop() {
 x= analogRead(A0);// analog input from the pin A0 connected to LDR and POT. end
 y= map(x,0,1023,0,255); // Mapping or converting the value bw minimum to maximum analog value to the pwm value
 analogWrite(6,y); // Writing this analog value to pin 6 which is connected to the base of the transistor to get reduced o/p voltage
 
 Serial.print("LDR input "); 
 Serial.print(x);
 

 Serial.print("\t");

  Serial.print(" O/P PWM value ");
 Serial.print(y);
 Serial.println();

  delay(1000);
 

}