[sdiy] simple octave divider questions/in ARDUINO w CODE

[dan snazelle]

starting small, real small, with programming the Arduino, I am trying to figure out some things.

I have been playing around with the Arduino acting like a frequency division CHIP



SO I hooked up a 5volt square wave through a Cap to INPUT 0.




the question for me is whether or not I am using 

1. the right output type

and

2. the right type of operator


I set up the code to label the input and output
and then I tried dividing the input by 4

this did not work (on the PWM pin) it seemed to simply decrease the volume

however on the non PWM pin out ( i tried pin 8) dividing by 2, 4, etc DEFINITELY put out a slower square wave but it only worked in some frequency ranged 

I didnt have a scope hooked up at the time so I cant say yet how useful the pin 8 waveform will be for things like gates, etc


What I am trying to figure out is whether or not you CAN use the pwm pins for gate out, etc and if so, how do you control them?


here is my code :




//Dan Snazelle trying to make something work...BOOM CRASH BZZ BZZ 

const int INPUT0= 0;  // Analog in from 40106  square-wave osc

const int octaveout = 8; // Analog output pin that is divided down I am using this output right now but
//const int octaveout = 9; // Analog output pin that is divided down, you could use this line

int SQUARE = 0;        // value read from the pot
int OCTAVE = 0;        // value output to the output (analog out)
int DATA=0;           //place to put the data from SQUARE

void setup() {

}

void loop() {
  // read the analog in value and try to divide it down:
SQUARE= analogRead(INPUT0);     //input 0    
OCTAVE=map(SQUARE,0,1023,0, 255);
DATA=SQUARE/2;  //i used data so i could keep track of which function contained manipulated data
  analogWrite(octaveout, DATA);     
  // DATA IS FINAL OUTPUT...I have tried this coming out of pin 9 which is a  PWM out and out of pin 8. It seems to
  //actually work when I use pin 8. maybe changing frequency on PWM pins is not as easy as simply reading in and out and usign arithmetic?
                     
}