random generator

International Nederlands
1

Beste,

Ik wil een programmaatje maken die in 7 op de 10 keren een led laat oplichtten en in 3 op de 10 keren niet,ik heb dit geprobeerd met het volgende programma;

/*
  


 set pin numbers:
 
*/ 
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  15;      // the number of the LED pin
long randNumber;
const int output = 8;
int led = 13;
const int randompin = 0;

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT); 
Serial.begin(9600);

  // if analog input pin 0 is unconnected, random analog
  // noise will cause the call to randomSeed() to generate
  // different seed numbers each time the sketch runs.
  // randomSeed() will then shuffle the random function.
  randomSeed(analogRead(0));  
  pinMode(led, OUTPUT); 
}

void loop(){
  

  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {     
    // turn LED on:    
    randNumber = random(10);
  Serial.println (randNumber);  
  } 
  else {
    // turn LED off:
    analogWrite(randompin, LOW); 
  }

   

 delay(50);
 
 if (randNumber <= 7) {
   digitalWrite (output, HIGH);
   delay(1000);
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);   
  }
 else {  
   digitalWrite (output, LOW); 
 }
}

Maar dit werkt niet,de led blijft altijd branden. Zijn er nog andere opties om zo'n sequentie te programmeren?
Alvast bedankt

Mvg Lowie

Moderator edit:
</mark> <mark>[code]</mark> <mark>

</mark> <mark>[/code]</mark> <mark>
tags added.

2

Please make a new sketch for only the led.
You have now "ledPin", "output", "led" and "randompin". I don't know which one should be blinking.
The analogWrite uses a value, not a LOW: http://arduino.cc/en/Reference/analogWrite

3

Probeer dit eens

const int buttonPin = 2;     // the number of the pushbutton pin
const int led = 13;

void setup() 
{
  pinMode(led, OUTPUT);      
  pinMode(buttonPin, INPUT); 
  Serial.begin(9600);

  randomSeed(analogRead(0));  
}


void loop()
{
  int buttonState = digitalRead(buttonPin);
  delay(50); // debounce buttonPin

  int randNumber = random(10);  // keep asking for random numbers increases the entropy

  if (buttonState == HIGH) 
  {     
    Serial.println(randNumber);
    int state = randNumber < 7;
    digitalWrite(led, state);

  }
}