This way, even though the state immediately after power on is predictable, the state changes very rapidly, and becomes unpredictable (unless the microcontroller state is monitored very closely at something like microsecond intervals). Use a timer to consume random numbers, and/or consume random numbers when idle.
#Random arduino generator
Seed the random number generator at bootup (in setup() in Arduino) only.
#Random arduino how to
Here is my advice on how to implement a random number generator on Arduino, or indeed any microcontroller: Why is that? Is there a way I can get random and randomSeed to work together when randomSeed is in setup and random is called in global? However when random is in loop, it reacts to changes from randomSeed. I've ran some tests and found that changes to randomSeed() do not affect the numbers generated by random when random is outside both loop and setup. If there is any more details I can provide or if anyone knows of a post on a similar issue please let me know.Īrduino Code tends to have 3 parts. I've also tried calling randomSeed in the global scope instead of setup but I get hit with the following error when I do so.Įxpected constructor, destructor, or type conversion before '(' token However I have reset my arduino many times and gotten 2 as the first number about 30 consecutive times. The random number I am generating is in a very small range (0-4). Would having randomSeed in the setup and random in the global scope cause a problem when these two work together? I am new to how "setup" interacts with the rest of the code in arduino.
I am calling random in the global scope because I want a single random starting point for my roulette game (where the "ball" enters).
Does anyone know where my problem may lie? However when I reset my arduino, I get the same exact results. This random number represents where my ball "enters". I am using randomSeed(analogRead(0)) combined with random(min,max) to generate a random number. My problem is that the ball stops at the same location every time. I am coding a roulette game in arduino's C++ based environment that flashes LEDs to represent the ball circling and stopping.
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