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/* PWM controller. Control PWM with serial input. Display info on LCD.
*/


 // include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

volatile int inDutyCycle=0;
volatile int inSer=-1;

 void setup(){
   // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // initialize the serial communications:
  Serial.begin(9600);
 }

 void loop(){
   inSer = serialReadInt();
   if(inSer>=0 && inSer<=100){
     inDutyCycle=inSer;
     Serial.println(inDutyCycle);
   }
   analogWrite(9, 255*(inDutyCycle/100));
   lcd.clear();
   lcd.write("Duty-Cycle: ");
   lcd.print(inDutyCycle);
   lcd.setCursor(0,1);
   lcd.write("    ");
   delay(1000);

 }


 //Reads integer from serial input
 int serialReadInt(){
   int i, bytesAvailable;
   char input[4];
   if(Serial.available()>0){
       delay(5);
       bytesAvailable = Serial.available(); //number of input bytes
       for(i=0;i<bytesAvailable;i++)
         input[i] = Serial.read();
       input[i]='\0'; //end of string
       return atoi(&input[0]);
   }
   else
     return -1;
 }