Interrupts & Servos

Using Arduino Programming Questions
1

Hi,
I'm trying to create a program to when I push a button it interrupts and changes which servo is receiving the distance sensor value. I need to use a interrupt because I'm wanting the servos to receive a "live" feed from the distance sensor.
Here is Jeremy Blum's Code (Tutorial 10 for Arduino: Interrupts + Debouncing – JeremyBlum.com):

//Program by Jeremy Blum
//www.jeremyblum.com
//Use hardware Debounced Switch to Control Interrupt

//Setup the Button
int buttonInt = 0; //AKA digital pin 2

//Setup the LEDs
int yellowLED = 11;
int redLED = 10;
int greenLED = 9;
int nullLED = 6;
volatile int selectedLED = greenLED;

//Setup the Distance Sensor
int distPin = 0;

void setup()
{
  pinMode (redLED, OUTPUT);
  pinMode (greenLED, OUTPUT);
  pinMode (yellowLED, OUTPUT);
  pinMode (nullLED, OUTPUT);
  attachInterrupt(buttonInt, swap, RISING);
}

void swap()
{
  if (selectedLED == greenLED)
    selectedLED = redLED;
  else if (selectedLED == redLED)
    selectedLED = yellowLED;
  else if (selectedLED == yellowLED)
    selectedLED = nullLED;
  else
    selectedLED = greenLED;
}

void loop()
{
  //Read Distance Sensor
  int dist = analogRead(distPin);
  int brightness = map(dist, 0, 1023, 0, 255);
  
  //Control LED Brightness
  analogWrite(selectedLED, brightness);

}

I was thinking of changing the led's to servos:

void swap()
{
  if (selectedServo == servoPin)
    selectedServo = servoExample;
  else (selectedServo == servoExample)
    selectedServo = servoPin;
}

Except this does not work.

How can I achieve this?

2 
void swap()
{
  if (selectedServo == servoPin)
    selectedServo = servoExample;
  else (selectedServo == servoExample)
    selectedServo = servoPin;
}

Sort out your swap function. As it stands it makes no sense at all.

Mark

3

I need to use a interrupt

Doesn't seem very likely.

holmes4:

void swap()

{
  if (selectedServo == servoPin)
    selectedServo = servoExample;
  else (selectedServo == servoExample)
    selectedServo = servoPin;
}




Sort out your swap function. As it stands it makes no sense at all.

Mark

I disagree - this bit

void swap()
{
  if (selectedServo == servoPin)
    selectedServo = servoExample;
  else

makes sense.

4

Yes but the rest does not. OP needs to learn to read the code ne has writen.

Mark

5

holmes4:
Yes but the rest does not. OP needs to learn to read the code ne has writen.

Mark

Oh! The irony :wink:

6

Yes but the rest does not. OP needs to learn to read the code ne has writen.

Among other things, you misspelled stolen.