How to use random function? Please Help

Projects Programming
6

UKHeliBob:
Use the number returned by random() as the index to an array of phrases.

Something like

char * phrases[] = {"Phrase 1", "Phrase 2", "Phrase 3", "Phrase 4"};

void setup()
{
  Serial.begin(115200);
  randomSeed(analogRead(A0)); //attempt to make the sequence more random
}

void loop()
{
  byte index = random(0, 3);  //get a number between 0 and 3
  Serial.println(phrases[index]); //use it as the index to the array of phrases
  delay(1000);
}

Hi, thanks for your reply, This is the exact code as I wanted and is working well in serial monitor, thank you so much,

but as I moved forward to transform into an led and button, its like as soon
as I will press the Push button, a random phrase should come to the LCD and stay until I leave the Button..

You can view the code below but the problem is , as soon as I press the button , a random phrase comes, but it keeps changing very fast, if I add a delay, little slow, I want it to just select one and then choose another one next time..

If you want I can shoot a video and upload to youtube,

the code is here....

const int buttonPin = 7;
int buttonState = 0;
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
char * phrases[] = {"Phrase 1", "Phrase 2", "Phrase 3", "Phrase 4"};

void setup()
{
  ///Serial.begin(115200);
  pinMode(buttonPin, INPUT);
  lcd.begin(16, 2);
  pinMode(9, OUTPUT);
  analogWrite(9, 50);
  randomSeed(analogRead(A0));
}

void loop()
{
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH)
  {
    lcd.clear();
    lcd.print("Press button to get a random phrase.");
    delay(500);
  }
  else if (buttonState == LOW) {

    byte index = random(0, 4);  //get a number between 0 and 4 :D
    lcd.setCursor(0, 0);
    lcd.clear();
    lcd.print(phrases[index]); //use it as the index to the array of phrases


  }

}

Thanks!!