even counting script help

Projects General Guidance
1

heya all
im a few months new to the arduino world im into modifying show lasers and want to create a more "intelligent" show light that counts beats and alters pattern to music structure not just beat trigger .

my aim is to write a script that's an event counter "not an event time timer" so the basics im after a script that would sense a digital input that goes low to high to low it counts 1 then second low to high to low counts a count of 2 ... then to have a variable pre defined parameter of count limit before an output change happens say a pwm % change so eg , every 4 event counts it makes a pwm change 100% to 75% ect. also it keeps counting while the pwm is running a steady output till the next 4 events happen then it changes the output % again but also say be able to change the event total counts to 8,16,32 events . i understand the physical side and have worked out basic pwm control from messing with the sweep sketch and already have the pwm out operating with a laser correctly and the audio sensing running as a digital high low . I'm just not to sure on how to create an event counter or how to use: "and , or , if" statements and their correct use .

any light to be shone on helping me understanding this would be greatly appreciated thank you for reading

2

You should check the interrupt - http://arduino.cc/en/Reference/AttachInterrupt -

a simple example with the built in LED as light

int pin = 13;
volatile int counter = 0;

void setup()
{
  pinMode(pin, OUTPUT);
  attachInterrupt(0, irq, FALLING);  // HIGH -> LOW
}

void loop()
{
  if (counter == 4)
  { 
    digitalWrite(pin, HIGH);
  }
  if (counter >10)
  { 
    digitalWrite(pin, LOW);
    counter = 0;
  }
}

void blink()
{
  counter++;
}
3

well thankyou that does answer some questions by breaking the code up and reading each parts purpose ill have to load this sketch up and have a go at messing with it to get the desired affects and work from there .. :slight_smile: greatly appreciated

4

heya just a quick one on line 5 of this code u you have put

"attachInterrupt(0, irq, FALLING); // HIGH -> LOW
}"

what is the purpose of the irq as it choks up as an error when loaded in arduino . in my understanding of this where u have placed irq that is to be the function title to be run when the interupt triggers also i have changed the FALLING statment to RISING to be able to use a positive 5v pulse as the signal in the great words of a short ranga "??? please explain ???" lol
cheers once again

5

"attachInterrupt(0, irq, FALLING);

Shouldn't that be "blink", not "irq"?

6

lol im not sure as to this side of scripting as im still verry fresh and learning the hows of it all hence why i have started this thread to c if any one can help shine some light on my project of a "smarter " show light

7

i have just changed the "irq" to "blink" and it passed the compiler

8

heya this is what i have done so far with the script its working marvelously with the analog laser im using thank you for your assistance just a few quick questions. the replacement of irq to blink . what are these to commands functions as i cant find them in the reference page at all yes blink is working in the script but i am trying to work in a second interrupt pin for reset to "count 0" at any time for full laser blanking just wondering how i could do this as i have tried to double up on the input codes and change the listing for the next pin over to create a second count but it didnt work "guessing there can only be only 1 total count tally "

this is harder than i though it would be to learn from scratch ..lol

int pin = 9;// led out
volatile int counter = 0; //pin 2 interupt imput

void setup()
{
pinMode(pin, OUTPUT);
attachInterrupt(0, blink, RISING); // HIGH -> LOW
}

void loop()
{
if (counter == 1)
for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) {
// sets the value (range from 0 to 255):
analogWrite(pin, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}

if (counter == 2)
{
digitalWrite(pin,LOW);
}

if (counter == 3)
{
analogWrite(pin,15);
}

if (counter == 4)
{
digitalWrite(pin,LOW);
}

if (counter == 5)
{
digitalWrite(pin,HIGH);
}

if (counter == 6 )
{
digitalWrite (pin ,LOW);
}

if (counter == 7)
{
analogWrite(pin,25);
}

if (counter == 8)
{
digitalWrite(pin,LOW);
}

if (counter == 9)
{
analogWrite(pin,30);
}

if (counter == 10)
{
for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) {
// sets the value (range from 0 to 255):
analogWrite(pin, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
}

if (counter == 11)
{
digitalWrite(pin,LOW);
}

if (counter == 12)
{
digitalWrite (pin ,HIGH);
}
if (counter == 13)
{
analogWrite(pin,40);
}

if (counter == 14)
{
digitalWrite(pin,LOW);
}

if (counter == 15)
{
digitalWrite(pin,HIGH);
}

if (counter == 16)
{
digitalWrite (pin ,LOW);
}

if (counter == 17)
{
analogWrite(pin,50);
}

if (counter == 18)
{
analogWrite(pin,128);
}

if (counter == 19)
{
digitalWrite(pin,LOW);
}

if (counter == 20)
for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {
// sets the value (range from 0 to 255):
analogWrite(pin, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}

if (counter == 21)
{
digitalWrite(pin,HIGH);
}

if (counter == 22)
{
analogWrite(pin,70);
}

if (counter == 23)
{
digitalWrite(pin,HIGH);
}

if (counter == 24)
{
analogWrite(pin,80);
}

if (counter == 25)
{
digitalWrite(pin,LOW);
}

if (counter == 26 )
{
digitalWrite (pin ,HIGH);
}

if (counter == 27)
{
analogWrite(pin,85);
}

if (counter == 28)
{
digitalWrite(pin,LOW);
}

if (counter == 29)
{
analogWrite(pin,95);
}

if (counter == 30)
for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {
// sets the value (range from 0 to 255):
analogWrite(pin, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}

if (counter == 31)
{
digitalWrite(pin,LOW);
}

if (counter == 32)
{
digitalWrite (pin ,HIGH);
}
if (counter == 33)
{
analogWrite(pin,105);
}

if (counter == 34)
{
analogWrite(pin,200);
}

if (counter == 35)
{
digitalWrite(pin,LOW);
}

if (counter == 36)
{
digitalWrite (pin ,HIGH);
}

if (counter == 37)
{
analogWrite(pin,115);
}

if (counter == 38)
{
digitalWrite(pin,LOW);
}

if (counter == 39)
{
analogWrite(pin,125);
}

if (counter == 40)
{
analogWrite(pin,10);
}

if (counter == 41)
for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {
// sets the value (range from 0 to 255):
analogWrite(pin, fadeValue);
// wait for 30 milliseconds to see the dimming effect
delay(30);
}

if (counter >= 42)
{
digitalWrite (pin,LOW);
counter =0;
}

}

void blink()
{
counter++;
}