// @TESLATRONICA 2019.

// pin 9 arduino nano >>> out signal 111 Hz
// pin 3 arduino nano >>> out signal 1110 Hz

//pin A0 arduino nano >>> to cental pin pontentiometer 10k (for gate regulation)
// right pin potentiometer 10k to +5V
// left pin potentiometer 10k to negative
// potentiometer all left >>> no gate (constant output signal)
// potentiometer move to right >>> activate gate 5 Hz to 0.5 Hz (200 ms to 2s aprox)

long time_;

int gate_ = 0;
long gate_contador = 0;
int gate5 = 0;
int gate_2 = 0;

int array_time_gate[] = {0, 200, 500, 1000, 1500, 2000}; // gate values 5 Hz to 0.5 Hz (200 ms to 2s aprox)
int startButton = 13; //pin recieving info from start button
int startLED = 4;   
unsigned long timerCount = 0; // variable to hold our timer info
#include <PWM.h> // library frequency "PWM"

void setup() {
  pinMode(startButton, INPUT_PULLUP); //set pin as recieving info
  pinMode(startLED, OUTPUT); 
  digitalWrite(startLED, LOW); 
  
   InitTimersSafe();

  SetPinFrequencySafe(9, 111); // 111 Hz to pin PWM 9
  pwmWrite(9, 50 * 2.55); // 50% duty Cicle

  SetPinFrequencySafe(3, 1110); // 1110 Hz to pin PWM 3
  pwmWrite(3, 50 * 2.55); // 50% duty Cicle
}

void loop() {
if (digitalRead(startButton) == HIGH) 
    { //if the start button has be pushed
     timerCount = 20 * 60 * 10; //set timer to approximately 5 mins 
     //(20 mins *  60 sec * 10 * 1 deciseconds)
     //this is set up to restart the timer whenever the start 
     //button is pushed
     //not extremely exact since that is not what I needed for this project
     //if you are looking for something more exact, look into 
     //SimpleTimer() Arduino funtions and libraries:
     //http://playground.arduino.cc/Code/SimpleTimer#F_restartTimer
    }
  if (timerCount != 0)
   { //if the count down timer is still running
     digitalWrite(startLED, HIGH); 
     //tell the control pin to provide power to the project
     timerCount = timerCount - 1; 
     //count down of a decisecond (0.1 sec)
     delay(100); 
     //delay for timercCount refrence of a decisecond
   } 
   else { //if the timer has run out
     digitalWrite(startLED, LOW);
   }
  
  time_ = millis(); // read time since arduino power on

  gate_ = analogRead (0); // read pin A0 values of the "arduino nano" seleccionated with potentiometer 10K
  gate_ = map(gate_, 0, 1023, 0, 6); // 0 to 6 >>> 5 Hz to 0.5 Hz (200 ms to 2s aprox)
  if (gate_ > 5) {
    gate_ = 5;
  }
  gate_ = array_time_gate[gate_]; // read array fron potentiometer

  if (gate_ != 0) { //active gate
    gate(); // call to gate subroutine
  }

  if (gate_ == 0 && gate_2 == 1) { //reactivate frequencies
    SetPinFrequencySafe(9, 111); // 111 Hz to pin PWM 9
    pwmWrite(9, 50 * 2.55); // 50% duty Cicle

    SetPinFrequencySafe(3, 1110); // 1110 Hz to pin PWM 3
    pwmWrite(3, 50 * 2.55); // 50% duty Cicle
    gate_2 = 0;
  }
}


void gate() { // gate subroutine
  if (gate_ > gate5 + 2 || gate_ < gate5 - 2) {
    gate_contador = millis();
    gate5 = gate_;
    gate_2 = 1;
  }

  if (gate_2 == 0 && time_ >= gate_contador) { // desactivate pin9 and pin3
    pwmWrite(9, 0);
    pwmWrite(3, 0);
    gate_contador = gate_ + millis(); // selected gate valued + current time
    gate_2 = 1;
  }

  if (gate_2 == 1 && time_ >= gate_contador) { // active pin9 and pin3
    pwmWrite(9, 50 * 2.55);
    pwmWrite(3, 50 * 2.55);
    gate_contador = gate_ + millis(); // selected gate value + current time
    gate_2 = 0;
  }
}