A variable interval LED pulser??

[Mike, K8LH]

Couldn't you also do it without timer interrupts? Something like this perhaps (please excuse the C code)?

while(1)
{
  period = adcin(3);             // read pot'
  period = period / 10 + 1;      // scale to 1..103 (seconds)
  count = 1;                     // start new period
  while(period < count)          //
  { delay_ms(1000);              // delay 1 second
    count++;                     // bump count var'
  }
  led = 1;                       // turn on led
  delay_us(500)                  // for 1/2 second
  led = 0;                       // and off
  delay_us(500)                  // for 1/2 second
}

You could use a circuit as simple as the "Spinning Class Strobe" (below) but you would need to change the potentiometer scale to represent a Period of 1 to 103 seconds.

Regards, Mike