Arduino and coding doubt

Using Arduino Programming Questions
21

Yes, your code has to be modified.

22

I modified the code, Kindly check it out, it isn't working

int ledPin = 13; int inPin1 = 2; int inPin2 = 7; int val1 = 0; int val2 = 0;

void setup() {
pinMode(ledPin, OUTPUT);
pinMode(inPin1, INPUT_PULLUP);
pinMode(inPin2, INPUT_PULLUP);
digitalWrite(ledPin, LOW);
}

void loop() {
val1 = digitalRead(inPin1);
val2 = digitalRead(inPin2);
if( val1 == LOW )
{
digitalWrite(ledPin, HIGH);
}
else if( val2 == LOW )
{
digitalWrite(ledPin, HIGH);
}
else
{
digitalWrite(ledPin, LOW);
}
}

23

So what does it do ?

24

The LED stays on all the time

25

Either check you've connected to the right pins of the button switches, using a meter, or simply connect to opposite corners which always works.

Having checked the buttons each work as intended, then check your code does what'd expected.

BTW XOR is easy to code:

  if (digitalRead(inPin1) != digitalRead (inPin2))  // xor means "different".
    digitalWrite (ledPin, HIGH) ;
  else
    digitalWrite (ledPin, LOW) ;
26

... or you can use the C++ XOR operator:

void loop() {
digitalWrite( ledPin, digitalRead(inPin1) xor digitalRead(inPin1) );
}
27

what about

void loop () {
    digitalWrite (ledPin, digitalRead (inPin1);
}

then try inPin2

28

Computer says "no".

29

corrected

30

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