[sdiy] sine wave floating point conversion issue

[dan snazelle]

If I have a value in my program that is putting out floating point values (to make a sine wave) between 0.0 and 1.0

I would like to get these values into an integer value of between 0 and 255 for my dac routine.

i tried changing the type and multiplying the value and then dividing it, but then i ended up with negative and positive values....


here is the routine which MAKES the sine

	

void loop () {
  int FREQUENCY=25+analogRead(0);
  float sample;
   int j; 

	for(j = 0; j < NUM_SAMPLES; j++) {

		

  		sample = sin(2 * PI * FREQUENCY * j / SAMPLING_RATE);


sample is the value which is a float and puts out the number I want to transform into something usable for the dacOutput function.


This has shown me I need to get better and basic type conversion, etc


thanks