Trouble with for loop

Projects Programming
1

Hello guys, hope you're well.
I need some help on a question that I've found using arduino, because I´m new on this.
I've created a code to generate a sin function inside the for loop, and it works very well, the code is the following one:
"unsigned long amp = 500;

void setup() {
// put your setup code here, to run once:

Serial.begin(9600);

}

void loop() {
// put your main code here, to run repeatedly:

for(int i=0; i<360; i++){

Serial.println((amp/1)*(sin(i * (PI/180))));
}
}"

I'm trying to print the function in a PWM output pin and than passes it through a diode and get and input of the signal on an analog pin. The trouble that I'm having is that I can't use the function that I've created out of the for loop, and I can't find a way to print this and get the plotter os the analog input (that passes through the diode) inside the for loop. Hope you guys can help me.

Thanks everyone.

2

Your code does exit the for loop, then goes back round to the top of the loop() function and starts again.

What do you want to happen?

Please remember to use code tags when posting code.

3

The plotter is here :

You should obtain something similar to this

835×364 25.5 KB

4

A PWM pin uses the analogWrite() function which uses a value between 0 and 255. The sin() function returns a value between -1.0 and 1.0. When you multiply that by 500 you get a value that ranges from -500.0 to 500.0. To get that on a PWM pin you will have to scale it:

float val = 500.0 * sin(i * (PI/180));
  analogWrite(PWMPin, (val+500.0) * 255.0) / 1000.0);  // Scale -500..500 to 0..255

Note that the PWM signal will be 0V or +5V at any given time. You can smooth the pulses into an analog voltage with a low-pass filter. When you read the voltage to an analog input pin and read it with analogRead() you will get a value between 0 and 1023. To turn that back into 'val':

  int reading = analogRead(InputPin);
  val = (reading * 1000.0) / 1024.0 - 500.0;  // scale 0..1023 to -500..500