Arduino generate only one random number

Projects Programming
1

I have a task where I need to display random number for arduino and need it to display on LCD but after several coding , my LCD keep on and continuously display different number one after another , I only need it to display only one random number and it will not change .

#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
long randomnumber;

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

lcd.begin(16, 2);
randomSeed(10);
}
void loop() {
randomnumber = random(10);
lcd.setCursor(0, 0);
lcd.print(randomnumber);
}

Would somebody show me how?

2

Take all the code in loop and move it to the end of setup.

3

Thank you

4 
  randomSeed(10);

This guarantees the same random number on each run (after the change), do you really want that?

5

Whandall:

  randomSeed(10);

This guarantees the same random number on each run (after the change), do you really want that?

One could always use randomSeed(analogRead(A0)); //change to an unused analog pin
The floating pin returns a "noise" value that seems quite random. Works for the sketch I use it in.

6

DangerToMyself:
One could always use...

...something proven to be no better than...

randomSeed(10);

A better choice...
The reliable but not very sexy way to seed random.

That thread also includes a solid argument against using analogRead for entropy.

7

Random enough for my purposes. Maybe not for someone else's. Only they can make that determination.

But I'll keep that link in mind if I ever find a need for it. Thanks.

8

If there is user interaction, a seed can be derived from micros of first interaction.

9

That alone does not work particularly well for the Park-Miller generator and the way it is typically used in the Arduion world. Relatively low seed values result in a short string of distinctly non-random values. Shifting / rotating the micros value should help. (Or using Park-Miller the way it was intended to be used.)

DangerToMyself:
Random enough for my purposes.

Your purposes are currently irrelevant. We're here to help @Sammakini.

10

[quote author=Coding Badly link=msg=4313562 date=1569116211]
Your purposes are currently irrelevant. We're here to help @Sammakini.
[/quote]Obviously. But having options doesn't hurt Sammakini either. That said, if you feel my reply above does more harm than good, feel free to delete it.