Millis . How to calculate 80hz in millis%

Processing Libraries
5

Hello @vrtx,

Is a flash an ON and OFF cycle? What is the duty cycle you want?
You must give that consideration…

References:
https://en.wikipedia.org/wiki/Hertz
https://en.wikipedia.org/wiki/Frequency

Hardware considerations:

Consider something slower like the Wikipedia page animation that you can visualize.

Code that toggles every frame:

// Flashes (ON/OFF) at a frequency of 30 Hz with default frameRate of 60;

boolean toggle = false;

void setup() 
  {
  size(500, 500);
  fill(0);
  
  int fps = 60;
  int freq = fps/2;   // Toggling each frame
  
  println("fps:",  fps);
  println ("freq:", freq, "Hz"); 
  
  frameRate(fps);  // The default is 60 fps
  }

void draw() 
  {
  if (toggle)
    background(255, 0, 0);
  else
    background(255, 255, 0);
  
  toggle = !toggle;
  }

:)