/* BASIC PWM Program for IRF520 MOSFET module
 ***************************************************
   WIRING:
   5v pin on the Arduino to VCC on the Mosfet board
   GND pin on the Arduino to GND on the Mosfet board
   Pin 11 on the Arduino to SIG on the Mosfet board
 ***************************************************
   FUNCTION:
   The inbuilt LED and the Mosfet Ov (GND) output will fade up and down repeatedly
   If you open the Serial Port at 9600 Baud:
   You will see a text confirmation of the PWM value (0 - 255)
*/

int pwmPin = 11; // declare pin 11 as the pwm pin
int pwmValue = 0; // pin 11 pulse rate (0 - 255)
int pwmCount = 5; // the vale to count up / down

// Setup runs once when you press reset or re- power the board
void setup()  { 
  // Set the Serial line to 9600 baude
  Serial.begin(9600);
  // declare pin 3 to be an output:
  pinMode(pwmPin, OUTPUT);
} 

// the loop routine runs over and over until it is re-programmed
void loop()  { 
  // Start pin 11 at 0
  analogWrite(pwmPin, pwmValue);
  Serial.print("PWM value: ");
  Serial.println(pwmValue);

  // change the pwmValue for next time through the loop
  pwmValue = pwmValue + pwmCount;

  // flip the count direction of the pwmCount to remain within (0 - 255) 
  if (pwmValue == 0 || pwmValue == 255) {
    pwmCount = -pwmCount; 
  }     
  // wait for 50 milliseconds between counts (changes to count) 
  // Change this number to alter the speed at which pwmValue is changed
  // a higher number equals a slower change to pwmValue   
  delay(50);                         
}