How to blink randomly?

[alvin 0]

Yo, there Im using a tm4c1294nctd, Im wondering how to modify the existing blink example to make the internal led (D2/PF4) blinks randomly instead of a fixed time.

Im trying to modify the

digitalWrite(LED, HIGH);

digitalWrite(LED, HIGH);

with someting like

digitalWrite(LED[j], HIGH);

      j = (j+1) % 5;

But I realized this is gonna run over a given number of leds instead of time.

I humbly request ideas.

Thanks in advance!!!

[Rei Vilo 695]

Try Random Numbers

• random() 
• randomSeed() 

[enl 227]

Rei Vilo  hit the main point

 

I will ask WHICH blink example you are referring to. There are a number of them.

 

Background: the basic structure is that you turn on the LED, have a delay, turn off the LED, and another delay. What you did include your message does not show the delay... it is what turn on hte LED. There is a delay somewhere, and that is where you want the random value.

 

 

You may want to restrict the random value to a certain range to keep the random blinking reasonable in appearance.

[energia 485]

https://forum.arduino.cc/index.php?topic=5496.0