CodCipriFrecventiometer.ino

/*
Controlling a servo position using a potentiometer (variable resistor)
by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

modified on 8 Nov 2013
by Scott Fitzgerald
http://arduino.cc/en/Tutorial/Knob
*/
// la control la pornire trebe duty cicle sub 6%
/***
*vom folosi o frecenta de 500 de Herz rescriind libraria cu un timer digital
*/

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

int potpin = A0;  // analog pin used to connect the potentiometer
int val, val1;    // variable to read the value from the analog pin
int duty = 50;
int dc = 0;
//ISR Part
volatile unsigned long timp2;
volatile  float frecventa;
int interuptPin=3;// we set this for platform switching purpose
unsigned long timp1;
 char buffer[32];

void setup()
{
	timp1 = millis();
	myservo.attach(9);  // attaches the servo on pin 9 to the servo object
	myservo.write(0);
	Serial.begin(115200);
	//analogWrite(9,0);    
	pinMode(2, OUTPUT);
	digitalWrite(2, LOW);
	//ISR part
	pinMode(interuptPin, INPUT);
	attachInterrupt(digitalPinToInterrupt(interuptPin), ISRFunction, RISING);
	timp2 = micros();
	frecventa = 0;

	delay(3000);


}
//Task 01
// configureaza un timer la frecventa de 50 de kHz si sa pun o intrerupere la ea
// comuta un pin sus jos si vezi daca am 50 de kHz pe osciloscop
/*

*/


void timerSoftware()
{
	val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
	val1 = map(val, 0, 500, 35, 180);    // scale it to use it with the servo (value between 0 and 180) 
	val = map(val, 0, 300, 0, 100);
	duty = val;
	myservo.write(val1);

}
//---ISR PART 
//Functia din ISR
void ISRFunction()
{	
	frecventa = 1000000/(float)(micros() - timp2);
	timp2 = micros();
	//Serial.print(frecventa);


}
//Frecventiometer

void Frecventiometer()
{

	unsigned int frec1 = (int)frecventa;						// pentru functia snprint care NU accepta double
	unsigned int frec2 = (int)(frecventa * 10) % 10;

	snprintf(buffer, sizeof(buffer), "%d.%d", frec1, frec2);		// metoda antica toString NU merge cu double
	Serial.println(buffer);
}
//timer software


void loop()
{	
	Frecventiometer();	
	//folosim milis sa facem ceva la intervale de timp predefinite
	//----------------------------------------------ASTA !! Impreuna cu funtia timer software 
	if ((millis() - timp1) > 500) {
		timp1 = millis();
		timerSoftware();
		Frecventiometer();
	}
	//-----------------------------------------------
}
/*
// myservo.write(180);
//analogWrite(9,180);
//delay(100);
//delay(100);
// myservo.write(50);
//analogWrite(9,50);
//delay(100);
//analogWrite(9,50);
// myservo.write(0);
//delay(100);
OLD CODE	

vechiul timer software
if (dc>100) {
dc = 0;
timerSoftware();
}

delayMicroseconds(150);
--sfarsit timer
vechiul pwm softare
if (dc>duty) digitalWrite(2, LOW); else digitalWrite(2, HIGH);
dc++;
--sfarsit

*/