analogRead() !- digitalRead()

Using Arduino Programming Questions
#1

Hello,

I'm using a "JoyStick Breakout Module Shield For PS2 Game Controller For Arduino" that you can easilly find on ebay.

I always get a HIGH value when I'm trying to read the button state...

Here a simplified code to understand:

const int joy_z = 6;
void setup()
{
  pinMode(joy_z, INPUT);
  //pinMode(joy_z, INPUT_PULLUP); also tried this option but it doesn't change anything
}

loop {
  value = analogRead(joy_z); //Return a value > 0 when button unpressed and value = 0 when button pressed

  value = digitalRead(joy_z); //Always return HIGH

  delay(700);
}

I was expecting to use digitalRead method to read the button pressed state.

What is wrong ?

Thanks a lot for help,

Kind regards,

#2

So analogRead() does work? You don't make that clear.

The code is missing the declaration for joy_z.

How is the joystick wired? Do you have a datasheet or diagram you can give us?

#3

Hello,

analogRead works correctly.

It was written in the code:
//Return a value > 0 when button unpressed and value = 0 when button pressed

Here an exemple of wirring:

Still not understand why it not work...

Thanks for help

#4

Hi,
Can you post the working sketch not the one you posted. That one will not even compile due to obvious formatting errors.

I always get a HIGH value when I’m trying to read the button state…

If you use this example

Does it work?

Your posting isn’t even reading the separate arduino input that the key/button should be connected to.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Can you please post a copy of your complete compiling sketch, using code tags?
They are made with the </> icon in the reply Menu.
See section 7 http://forum.arduino.cc/index.php/topic,148850.0.html

Tom… :slight_smile:

#5

the variable "value" is never declared is it a "byte' or an "int" or?

//Return a value > 0 when button unpressed and value = 0 when button pressed

this doesn't make sense for a analogRead.

the x and y axis require only analogRead

the z axis is a button and so requires only digitalRead.

const int joy_z = 6;
int value;  // needed to declare this

void setup()
{
  
  pinMode(joy_z, INPUT_PULLUP); 
}

void loop() {
 
value = digitalRead(joy_z); // this is the only read needed

  delay(700);
}
#6