Duty Cycle Calculator and Frequency Meter

1/*  Code developed by L.Boaz
2 *  Nissi Embedded Laboratory
3 *  India  - 627 808
4 *  nissiprojectzone@gmail.com
5 *  facebook/nissiembeddedlab
6  */
7const int PWMGenerator = 5; //980Hz pulse generator arduino itself
8const  int PulseIN = 7;      // pulse counter pin
9float ONCycle;              //oncycle  variable 
10float OFFCycle;             // offcycle variable got microsecond
11float  T;                    // tota l time to one cycle ONCycle + OFFcycle
12int F;                      //  Frequency = 1/T
13float DutyCycle;            // D = (TON/(TON+TOFF))*100 %
14void  setup()
15{
16  pinMode(PWMGenerator, OUTPUT);
17  pinMode(PulseIN, INPUT);
18  Serial.begin(9600);
19  analogWrite(PWMGenerator,100); //sample pulse 980Hz 
20}
21void  loop()
22{
23  ONCycle = pulseIn(PulseIN, HIGH);
24  OFFCycle = pulseIn(PulseIN,  LOW);
25  //Serial.println(ONCycle);
26  //Serial.println(OFFCycle);
27  T =  ONCycle + OFFCycle;
28  DutyCycle = (ONCycle / T) * 100;
29  F = 1000000 / T;                    // 1000000= microsecond 10^-6 goes to upper
30   Serial.print("Frequency  = ");
31  Serial.print(F);
32  Serial.print(" Hz");
33  Serial.print("\
34");
35  Serial.print("DutyCycle = ");
36  Serial.print(DutyCycle, 2);
37  Serial.print("  %");
38  Serial.print("\
39");
40  delay(1000);
41}
42