While Loops - Arduino

 While loops

Allows more flexibility than a for loop.

A while loop will loop continuously, and infinitely, until the expression 

inside the parenthesis, () becomes false. 

 

Syntax

while (condition) {
  // statement(s)
}

 

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Example Code

var = 0;
while (var < 200) {
  // do something repetitive 200 times
  var++;
}

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//This code will print the numbers 1 to 10

//print a space

//then loop

int j; // counter
int delayTime=100;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  j=1;
  while (j<=10){
    Serial.println(j);
    delay(delayTime);
    j=j+1;
  }
  Serial.println(); // prints a gap
    
}

 

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 example 2

while the voltage at the pot is less than 1023 (5V)

the LED is off.

Any voltage above this turns the LED on.

 

int j; // counter
int potVal; // 0 to 1023(5V).. value of pot
int delayTime=100;
int potPin=A0;
int redPin=7;


void setup()
{
  Serial.begin(9600);
  pinMode(potPin,INPUT);
  pinMode(redPin,OUTPUT);
 
}

void loop()
{
  potVal=analogRead(potPin);
  Serial.println(potVal);
  delay(delayTime);
 
  while (potVal>1000) {
    digitalWrite(redPin,HIGH);
    potVal=analogRead(potPin);
    Serial.println(potVal);
    delay(delayTime);
    
    
    
  }
 digitalWrite(redPin,LOW);
    
}

 

 Links

+ Paul McWhorter Tutorial 17

 

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+ Arduino Index 

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